From: Bdale Garbee Date: Fri, 5 Dec 2008 18:02:32 +0000 (-0700) Subject: updating for better web publishing X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=commitdiff_plain;h=1ba0db5d53c9d2a44f5c1a9a7eff12862e406ffc updating for better web publishing --- diff --git a/rockets/projects/goblin10/index.html b/rockets/projects/goblin10/index.html index 2902aeb..d473141 100644 --- a/rockets/projects/goblin10/index.html +++ b/rockets/projects/goblin10/index.html @@ -1,10 +1,10 @@ -Goblin 10

Goblin 10

A NAR L3 Certification Rocket

Bdale Garbee

Copyright © 2008 Bdale Garbee

+Goblin 10

Goblin 10

A NAR L3 Certification Rocket

Bdale Garbee

Copyright © 2008 Bdale Garbee

This document is released under the terms of the Creative Commons ShareAlike 3.0 license. -

Revision History
Revision 1.015 November 2008
Successful certification flight at Hudson Ranch
Revision 0.228 October 2008
Revising during flight to DC
Revision 0.123 October 2008
Initial content, derived from YikStik

Table of Contents

1. Introduction
2. Design
Overview
Rocksim File
Drawing from Rocksim
Motor Retention
Nose Cone Electronics Bay
Electronics
Avionics
Stability Evaluation
Expected Performance
Recovery System
3. Construction Details
Airframe
Nose Cone
Avionics Bay
4. Recovery Systems Package
Recovery System Description
Recovery Initiation Control Components
5. Checklists
6. Flight Summary
7. Analysis and Conclusions

Chapter 1. Introduction

+

Revision History
Revision 1.015 November 2008
Successful certification flight at Hudson Ranch
Revision 0.228 October 2008
Revising during flight to DC
Revision 0.123 October 2008
Initial content, derived from YikStik

Table of Contents

1. Introduction
2. Design
Overview
Rocksim File
Drawing from Rocksim
Motor Retention
Nose Cone Electronics Bay
Electronics
Avionics
Stability Evaluation
Expected Performance
Recovery System
3. Construction Details
Airframe
Nose Cone
Avionics Bay
4. Recovery Systems Package
Recovery System Description
Recovery Initiation Control Components
5. Checklists
6. Flight Summary
7. Analysis and Conclusions

Chapter 1. Introduction

This is a rocket I'm building for my second attempt at a NAR Level 3 certification flight. It's basically a Polecat Aerospace Goblin 10 kit augmented with an additional electronics bay in the nose cone, some @@ -19,7 +19,7 @@ NCR launch sites under their standing waivers. The smallest reasonable motor for this rocket would be a Cesaroni K445 or equivalent, which would yield an apogee of about 2300 feet. -

Chapter 2. Design

Table of Contents

Overview
Rocksim File
Drawing from Rocksim
Motor Retention
Nose Cone Electronics Bay
Electronics
Avionics
Stability Evaluation
Expected Performance
Recovery System

Overview

+

Chapter 2. Design

Table of Contents

Overview
Rocksim File
Drawing from Rocksim
Motor Retention
Nose Cone Electronics Bay
Electronics
Avionics
Stability Evaluation
Expected Performance
Recovery System

Overview

The Goblin 10 kit is a simple "four fins and a nose cone" rocket that is short and squat, with a 98mm motor mount. It supports dual-deploy by @@ -28,19 +28,19 @@ centering rings, accessed by a side hatch. An additional payload bay will be built inside the nose cone to carry experimental altimeters, a tracking beacon, and possibly a GPS position reporting system. -

Rocksim File

+

Rocksim File

This is the current working design in Rocksim format: - Polecat_Goblin_10.rkt

Drawing from Rocksim

Motor Retention

+ Polecat_Goblin_10.rkt

Drawing from Rocksim

Motor Retention

I will include 8-24 T-nuts in the aft centering ring spaced to allow the use of an Aeropack 98mm retainer and associated 75mm adapter. -

Nose Cone Electronics Bay

+

Nose Cone Electronics Bay

Instead of using the supplied nose cone bulkhead, I intend to cut a custom one that would support installing a length of 98mm motor mount from the tip of the nose to the bulkhead. With a plate cut to cover the aft end of the airframe tube, this would form an electronics bay capable of holding a beacon transmitter, GPS system, or other custom electronics. -

Electronics

Avionics

+

Electronics

Avionics

The recovery system will feature dual redundant barometric altimeters in the main avionics bay between the two forward motor mount centering rings. @@ -54,7 +54,7 @@ A third rotary switch will be used as a SAFE/ARM switch configured to interrupt connectivity to all ejection charges in accordance with NAR certification requirements. -

Stability Evaluation

+

Stability Evaluation

The Goblin 10 kit designers indicate that the rocket is unconditionally stable with all motors that fit the motor mount geometry. Since we're adding mass at both ends, by @@ -76,12 +76,12 @@ I also note that the simulated margin of stability in my as-built configuration is fairly close to the margin of stability of the as-designed model. -

Expected Performance

+

Expected Performance

The Aerotech M1297W reload should carry this vehicle to just under 7000 feet AGL from Colorado Front Range launch sites. It should reach just over 2 miles on a Cesaroni M795 moon burner or equivalent. -

Recovery System

+

Recovery System

The recovery system will use dual redundant barometric altimeters firing 4F black powder charges using commercial e-matches. At apogee, a drogue chute will deploy with separation of the nose @@ -102,7 +102,14 @@

The recovery system attachment points will all use 1/4 inch u-bolts with nuts, washers, and backing plates through bulkheads. -

Chapter 3. Construction Details

Table of Contents

Airframe
Nose Cone
Avionics Bay

Airframe

+

Chapter 3. Construction Details

Table of Contents

Airframe
Nose Cone
Avionics Bay

+ I have collected all of my + + build photos + + in one place, they may show better than I can explain how various + aspects of the Goblin went together. +

Airframe

The airframe tubing provided in the Polecat kit is thick cardboard tube with a thin exterior fiberglass wrap. To increase airframe strength, and particularly to prevent zippers, additional reinforcement seemed @@ -115,7 +122,7 @@ curing by an inflatable child's bounce toy inside a plastic garbage bag. The result is a substantially strengthened tube, with carbon fiber lining from the leading edge back past the first centering ring. -

Nose Cone

+

Nose Cone

The provided nose cone bulkhead was replaced by a custom centering ring cut from 3/8 inch birch plywood. The ring's outer diameter was adjusted put place the ring approximately an inch forward of the end @@ -133,7 +140,7 @@ the piece of airframe tubing. After the epoxies cured, a rotary tool was used to cut the airframe tubing off flush with the aft surface of the centering ring. -

Avionics Bay

+

Avionics Bay

The avionics bay walls were installed approximately 90 degrees apart prior to installation of the motor mount assembly in the airframe. The airframe wall was marked for a 3.5 x 6.5" access hatch centered @@ -149,7 +156,7 @@ A suitably sized avionics sled should be possible to install and remove through the avionics bay hatch allowing for possible future experiments with alternative avionics. -

Chapter 4. Recovery Systems Package

Table of Contents

Recovery System Description
Recovery Initiation Control Components

Recovery System Description

+

Chapter 4. Recovery Systems Package

Table of Contents

Recovery System Description
Recovery Initiation Control Components

Recovery System Description

This rocket uses dual deployment.

The apogee event separates the nose cone from the @@ -173,7 +180,7 @@ chute apex, with a smaller drogue chute deployed to pull off the bag and cleanly deploy the main. The primary motivation for this is to prevent the main chute shrouds from tangling during ejection. -

Recovery Initiation Control Components

+

Recovery Initiation Control Components

The main avionics bay between the forward two centering rings is populated with two commercial altimeters, a PerfectFlite MAWD and a Missile Works miniRRC2. @@ -219,7 +226,7 @@ With a 10 foot Team Vatsaas design parachute and our anticipated build weight, the descent rate under main should be just over 20 feet per second. -

Chapter 5.  Checklists

  1. +

Chapter 5.  Checklists

  1. Planning
    1. Pick a club launch with suitable waiver and facilities to @@ -404,7 +411,7 @@ flight line
    2. bring the rocket to observers for post-flight inspection -

Chapter 6. Flight Summary

+

Chapter 6. Flight Summary

A successful level 3 certification flight occurred on 15 November 2008 at the SCORE Hudson Ranch launch facility. The motor was an Aerotech M1297W provided by Tim Thomas of Giant Leap Motors, the igniter was @@ -436,7 +443,7 @@ Video of the launch taken by Jeff Lane

  • Video of the launch taken by Jason Unwin -

    • Chapter 7. Analysis and Conclusions

    +

    Chapter 7. Analysis and Conclusions

    The ascent was straighter than expected... very smooth during the motor burn, then a couple slow rolls during coast. The two altimeters agreed within 4 feet on the apogee. The max diff --git a/rockets/projects/yikstik/YikStik.jpg b/rockets/projects/yikstik/YikStik.jpg new file mode 100755 index 0000000..314a89d Binary files /dev/null and b/rockets/projects/yikstik/YikStik.jpg differ diff --git a/rockets/projects/yikstik/images.mdwn b/rockets/projects/yikstik/images.mdwn deleted file mode 100644 index b3cb7b3..0000000 --- a/rockets/projects/yikstik/images.mdwn +++ /dev/null @@ -1 +0,0 @@ -[[!map pages="rockets/projects/yikstik/images/* and ! rockets/projects/yikstik/images/*/*"]] diff --git a/rockets/projects/yikstik/images/2075055477_f46cf1e94b_o.jpg b/rockets/projects/yikstik/images/2075055477_f46cf1e94b_o.jpg deleted file mode 100644 index ba67e1a..0000000 Binary files a/rockets/projects/yikstik/images/2075055477_f46cf1e94b_o.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/images/660090167_ae17257f42_o.jpg b/rockets/projects/yikstik/images/660090167_ae17257f42_o.jpg deleted file mode 100644 index cc9e897..0000000 Binary files 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diff --git a/rockets/projects/yikstik/images/lipstick.jpg b/rockets/projects/yikstik/images/lipstick.jpg deleted file mode 100644 index 3284fc7..0000000 Binary files a/rockets/projects/yikstik/images/lipstick.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/images/lipsticks3_1323_general.jpg b/rockets/projects/yikstik/images/lipsticks3_1323_general.jpg deleted file mode 100644 index fa86e98..0000000 Binary files a/rockets/projects/yikstik/images/lipsticks3_1323_general.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/images/morepix b/rockets/projects/yikstik/images/morepix deleted file mode 100644 index ddc3c51..0000000 --- a/rockets/projects/yikstik/images/morepix +++ /dev/null @@ -1,67 +0,0 @@ -r717 - -2845 fins in vacuum bagging -2849 fins just out of vacuum bagging -2856 3 fins with excess CF roughly trimmed away on bench -2868 fit testing ebay bulkhead -2877 milling machine cutting centering ring with fin slots -2886 finished ring after light sanding -2888 fit testing fin-can ring -2891 set-up for sanding rings on lathe -2895 stack of rings for fin can, shows smaller one for zipperless coupler -2896 same stack skewed to show thicknesses -2899 installing inserts for rail buttons in fin can rings -2901 inserts after grinding flush with ring surface -2911 detail showing aircraft cable swage and JB Weld attachment -2913 detail showing how fins fit in to centering ring slots -2915 fin can with 2 rings glued, aircraft cable, fins dry-fit -2916 nose cone after cutting aft end off -2917 view into payload bay after coupler epoxied in -2920 payload bay and nose cone dry-fit testing -2922 one end of ebay showing wing nuts and u-bolt installed -2923 detail showing ebay bulkhead stepped milling, u-bolt hardware -2950 detail showing replacement of fin forward ring to allow use of tailcone -2954 dry fit of aft ring and tailcone -2960 dry fit of fins, aft ring, tailcone -2961 test fit of fin alignment jig -2964 detail showing fins epoxied to MMT, no glue on aft ring yet -2965 detail showing fins epoxied to MMT at forward ring end -2978 waiting for epoxy to cure with fin jig on -2983 dry fit of tailcone, adapters, J285 after epoxy set but while curing -2988 masked for first set of fin to MMT reinforcement -2990 detail of aft end with glass across MMT and in fin joints -2991 detail of forward end with glass across MMT and in fin joints -2992 bags of water holding glass in place during curing -2994 overall view of fin to fin reinforcement one side -3000 closeup of fin surfaces dremel-sanded before reinforcement installation -3009 marking airframe for fin slots -3012 dry fit of airframe after fin slotting -3015 closeup of aft end of airframe tube; fin slots and rail button hole -3016 rail button insert loaded with grease for airframe installation -3019 fin fronts taped to retain epoxy -3022 close up of aft end of airframe with rubber bands during epoxy pour -3026 close up of aft end showing interior during first epoxy pour -3035 taped and ready for first pair of interior fin to airframe fillets -3040 wiring of avionics power and safe/arm switches -3042 view of interior fin fillet, west systems with milled glass -3046 epoxy pour at front end of zipperless assembly -3048 taping to retain epoxy during pour associated with aft ring install -3052 aft ring installed, west systems poured and JB weld on MMT for tailcone -3054 tail cone fitted and epoxies curing - -m537r - -0754 interior of avionics bay showing switches and rail button block -0755 payload bay sled support ring -0756 avionics bay switches from outside, lousy job making holes in airframe -0758 much better job done for switch on payload bay -0763 assembling avionics and payload bay sleds -0770 6-32 inserts in sled support rings for avionics bay -0772 interior of avionics bay with sled support rings installed -0783 aft of payload bay after epoxy pour -0784 payload bay with sled installed for fit check -0785 screw retaining ring in nose cone -0791 avionics bay bulkhead ready to fly with charge holders, etc -0795 avionics sled with altimeters and 9V batteries installed - - diff --git a/rockets/projects/yikstik/index.html b/rockets/projects/yikstik/index.html index 9ed814e..da72f6c 100644 --- a/rockets/projects/yikstik/index.html +++ b/rockets/projects/yikstik/index.html @@ -1,10 +1,12 @@ -YikStik

    YikStik

    A NAR L3 Certification Rocket

    Bdale Garbee

    Copyright © 2008 Bdale Garbee

    - This document is released under the terms of the +YikStik

    YikStik

    A NAR L3 Certification Rocket

    Bdale Garbee

    Copyright © 2008 Bdale Garbee

    + This document is released under the terms of the Creative Commons ShareAlike 3.0 license. -

    Revision History
    Revision 1.028 October 2008
    +

    Revision History
    Revision 1.15 December 2008
    + Remove embedded images in favor of references to gallery.gag.com +
    Revision 1.028 October 2008
    Recording results of first, and only, flight attempt.
    Revision 0.527 September 2008
    Building checklists @@ -12,11 +14,11 @@ Documenting the build process as it happens
    Revision 0.329 March 2008
    Incorporate ideas from James Russell during initial L3CC review -
    Revision 0.227 March 2008
    Cleaned up for initial review
    Revision 0.116 March 2008
    Initial content

    Table of Contents

    1. Introduction
    Why "YikStik"?
    2. Design
    Overview
    Rocksim File
    Drawing from Rocksim
    Airframe Tubing
    Nose Cone
    Fins
    Centering Rings and Bulkheads
    Motor Retention
    Electronics
    Avionics
    Payload
    Stability Evaluation
    Expected Performance
    Recovery System
    3. Construction Details
    Airframe and Couplers
    Fins
    Centering Rings and Bulkheads
    Assembling the Booster Section
    Avionics Bay
    Payload Bay
    Recovery System
    4. Recovery Systems Package
    Recovery System Description
    Recovery Initiation Control Components
    5. Stability Evaluation
    6. Expected Performance
    7. Checklists
    8. Flight Summary
    9. Analysis and Conclusions

    +

    Revision 0.227 March 2008
    Cleaned up for initial review
    Revision 0.116 March 2008
    Initial content

    Table of Contents

    1. Introduction
    Why "YikStik"?
    2. Design
    Overview
    Rocksim File
    Drawing from Rocksim
    Airframe Tubing
    Nose Cone
    Fins
    Centering Rings and Bulkheads
    Motor Retention
    Electronics
    Avionics
    Payload
    Stability Evaluation
    Expected Performance
    Recovery System
    3. Construction Details
    Airframe and Couplers
    Fins
    Centering Rings and Bulkheads
    Assembling the Booster Section
    Avionics Bay
    Payload Bay
    Recovery System
    4. Recovery Systems Package
    Recovery System Description
    Recovery Initiation Control Components
    5. Stability Evaluation
    6. Expected Performance
    7. Checklists
    8. Flight Summary
    9. Analysis and Conclusions

    Please note that I stopped adding photos to this document at some point. I have many more photos of the YikStik build, but haven't decided how best to present them yet... update coming someday! -

    Chapter 1. Introduction

    Table of Contents

    Why "YikStik"?

    +

    Chapter 1. Introduction

    Table of Contents

    Why "YikStik"?

    This is the rocket I'm designing for my NAR Level 3 certification flight. The general idea is to build a fairly cheap rocket capable of reliably flying this year's Aerotech level 3 special, which is an M1297W reload. @@ -36,20 +38,19 @@ could safely fly on reloads as small as a J for economical fun. Those altitudes mean the certification flight will need to be at a site with a high-altitude waiver like the NCR north site. -

    Why "YikStik"?

    +

    Why "YikStik"?

    I've always thought the high-gloss red paint job on one of my son's rockets when out on a launch rod in the sun looks a lot like glistening wet lipstick.

    Combine that with the fact that my wife who isn't fond of the stuff refers to lipstick as "yik stick"... and the rest should be obvious. -

    +

    My planned paint scheme is a bright red nosecone, gold tube, and black fin can, which is the mental image I have of what lipstick applicators look like, most likely from a stick my mother or one of my grandmothers had - when I was a child. Something like the image by Calliope1 that I found - on flickr.com. -

    Chapter 2. Design

    Table of Contents

    Overview
    Rocksim File
    Drawing from Rocksim
    Airframe Tubing
    Nose Cone
    Fins
    Centering Rings and Bulkheads
    Motor Retention
    Electronics
    Avionics
    Payload
    Stability Evaluation
    Expected Performance
    Recovery System

    Overview

    + when I was a child. +

    Chapter 2. Design

    Table of Contents

    Overview
    Rocksim File
    Drawing from Rocksim
    Airframe Tubing
    Nose Cone
    Fins
    Centering Rings and Bulkheads
    Motor Retention
    Electronics
    Avionics
    Payload
    Stability Evaluation
    Expected Performance
    Recovery System

    Overview

    YikStik is a fairly simple "three fins and a nose cone" dual-deploy rocket using a 75mm motor mount, 4 inch glass-wrapped phenolic airframe with zipperless fin can, plastic nose cone, plywood fins, @@ -57,17 +58,17 @@ The primary electronics bay will be designed to hold two altimeters, and a distinct payload bay may carry an experimental altimeter, GPS receiver, and downlink transmitter. -

    Rocksim File

    +

    Rocksim File

    This is the current working design in Rocksim format: - YikStik.rkt

    Drawing from Rocksim

    Airframe Tubing

    + YikStik.rkt

    Drawing from Rocksim

    Airframe Tubing

    I intend to cut the airframe components from two 48 inch lengths of 98mm Giant Leap Dynawind tubing. The 30 inch main bay and 18 inch drogue bay will be cut from one length, while the 33 inches of fin can, 2 inches of electronics bay, and 8 inches of payload bay will be cut from the second. -

    Nose Cone

    +

    Nose Cone

    I intend to use a Giant Leap "Pinnacle" 3.9 inch nose cone. -

    Fins

    +

    Fins

    The fins are designed from scratch, and I intend to build them up from two layers of 1/8 inch birch plywood, three layers of carbon fiber, and two layers of 6 oz glass. The stack will be glass, carbon fiber, @@ -84,18 +85,18 @@ The airframe will be slotted to allow the completed motor mount / fin assembly to be inserted from the rear, with fillets of epoxy applied inside and outside the airframe after insertion. -

    Centering Rings and Bulkheads

    +

    Centering Rings and Bulkheads

    All centering rings and bulkheads will be custom machined from 3/8 inch birch plywood using my 3-axis CNC milling machine. Some rings will use laminated pairs of 3/4 inch total thickness to enable use of threaded inserts for 1/4-20 rail button screws or deep routing for fin alignment slots. -

    Motor Retention

    +

    Motor Retention

    I will embed three 8-24 T-nuts in the aft centering ring spaced to allow the use of home-made Kaplow clips to retain 75mm motors. The same holes may be used to attach custom motor mount adapters for smaller diameter motors. -

    Electronics

    Avionics

    +

    Electronics

    Avionics

    The recovery system will feature dual redundant barometric altimeters in an electronics bay similar to the LOC design located between the drogue and main parachute bays. @@ -108,7 +109,7 @@ Each altimeter will have a separate battery and power switch. A 4PDT slide switch will be used as a SAFE/ARM switch configured to interrupt connectivity to the ejection charges. -

    Payload

    +

    Payload

    I hope to fly my own altimeter design @@ -120,7 +121,7 @@ This is not essential to fly, but could make recovery simpler and would just be fun to fly if I can get it all working and suitably ground and/or flight tested in time. -

    Stability Evaluation

    +

    Stability Evaluation

    This design has been thoroughly analyzed using RockSim @@ -133,7 +134,7 @@

    These simulations will be refined as the build proceeds and as-built stability verified before flight. -

    Expected Performance

    +

    Expected Performance

    The Aerotech M1297W reload should carry this vehicle without ballast to just over 14 thousand feet AGL. It should make over 16 thousand feet AGL on an M1850W, and should fly stably to roughly 2.5k feet AGL @@ -146,7 +147,7 @@ If the cert succeeds, then I might try an optimal mass flight sometime later on an M1850W or equivalent "bigger M" reload to join the "three mile club". -

    Recovery System

    +

    Recovery System

    The recovery system will use dual redundant barometric altimeters firing black powder charges. At apogee, a drogue chute will deploy from just forward of the fin can, @@ -179,7 +180,14 @@ of 1/2 inch tubular kevlar, bonded to the motor mount. If available, a screw-eye attached to the forward motor closure may be used instead of or in addition to this recovery attachment loop. -

    Chapter 3. Construction Details

    Table of Contents

    Airframe and Couplers
    Fins
    Centering Rings and Bulkheads
    Assembling the Booster Section
    Avionics Bay
    Payload Bay
    Recovery System

    Airframe and Couplers

    +

    Chapter 3. Construction Details

    Table of Contents

    Airframe and Couplers
    Fins
    Centering Rings and Bulkheads
    Assembling the Booster Section
    Avionics Bay
    Payload Bay
    Recovery System

    + I have collected all of my + + build photos + + in one place, they may show better than I can explain how various + aspects of YikStik went together. +

    Airframe and Couplers

    The tubing for the airframe, couplers, and motor mount was all cut using a carefully aligned and adjusted power mitre saw, and the ends lightly sanded to remove rough spots. @@ -188,14 +196,14 @@ bay were cut from the second. The three couplers for the fin can, electronics bay, and payload bay were cut from Giant Leap 98mm phenolic coupler stock. And the motor mount was cut from Giant Leap 75mm - phenolic airframe stock. This photo shows the airframe tube on the - left, the motor mount in the middle, and the coupler sections on the - right. Note that the motor mount is the longest piece because of + phenolic airframe stock. + Note that the motor mount is the longest piece because of the zipperless design with full-length motor mount. -

    +

    The airframe tubing selected includes a wrap of 10oz glass in epoxy - over the base phenolic tubing (visible in the previous photo as a - shine on the outside of the tubing), but the coupler stock is unreinforced. + over the base phenolic tubing (visible in some photos as a + shine on the outside of the tubing), + but the coupler stock is unreinforced. To ensure the couplers can handle the anticipated loading, I reinforced each with one layer of interior carbon fiber, using the "kitchen vacuum bagging" technique documented by @@ -212,8 +220,7 @@ after reinforcing to get "perfect" ends. The technique worked marvelously otherwise, and the resulting couplers look and should work great! -

    -

    Fins

    +

    Fins

    Six pieces of 1/8 inch birch plywood were stacked, edge-aligned on what would be the fin root edge, and clamped. The outline of the fin design was marked in pencil, and three 1/8 inch holes drilled through the @@ -221,23 +228,24 @@ blanks together while making the initial cuts, so that they would all be matched in size. The clamps were removed to avoid interference during cutting. The fin outline was then cut using a radial arm saw. -

    - A router table with 1/8 - in roundover bit was then used to round over the outer edge, 3 blanks on +

    + A router table with 1/8 inch + roundover bit was then used to round over the outer edge, 3 blanks on one side and three on the other. This edge might have been left square, but I prefer the look and feel of rounding. The router table with a 1/2 inch diameter straight cutting bit and a fin beveling jig was used to impart a 10-degree bevel on the leading and trailing edge of each fin blank, again 3 on one side and three on the other. The resulting 6 - blanks thus form 3 pairs of fin components with a modified airfoil shape. -

    -

    + blanks thus form 3 pairs of fin components with a modified + airfoil shape. +

    The fin assembly started with a simple lamination of two layers of ply sandwiching a layer of carbon fiber. Each fin used "one pump" of West Systems epoxy and the stack was vacuum bagged using the Foodsaver with wide bagging material. To keep everything flat while the epoxy cured, the stack of fins was sandwiched between two unused extra shelves for - a storage cabinet I had on hand (particle board covered in laminate, very + a storage cabinet I had on hand + (particle board covered in laminate, very flat and smooth, nearly inflexible at this loading), and stacked with about 75 lbs of loose barbell weights.

    @@ -245,10 +253,7 @@ 1-2mm in the longest axis. The other two are nearly perfect. Light sanding should allow me to match them before laminating the outer layers of carbon fiber and glass. -

    -

    -

    -

    +

    After the fins cured, they were bulk sanded with medium and fine sandpaper and an electric palm sander. Final sanding of the leading and trailing edges was done using 400 grit paper on a flat surface, @@ -273,26 +278,26 @@ sides were done one at a time and allowed to cure before proceeding. The results look good, and in combination with internal and external airframe filets should yield a super-strong fin can. -

    Centering Rings and Bulkheads

    +

    Centering Rings and Bulkheads

    Pairs of 3/8 inch birch plywood blanks were laminated using Titebond wood glue and clamped while curing to form 3/4 inch blanks for centering rings. From a strength perspective, 3/8 inch should suffice, but there are two reasons for going with thicker blanks in some places. The first is that the rail buttons chosen use 1/4-20 mounting screws, and threaded - inserts in that size are nearly 3/8 inch outside diameter (and thus would + inserts in that size are nearly 3/8 inch outside diameter + (and thus would tear up a ring only 3/8 inch thick on insertion). The second is that I like to mill slots in the centering rings on each end of the fins to "lock" the fins into position. Doubling the blanks used to cut those rings will allow me to cut 1/4 inch deep fin slots and still have a half inch of unmolested wood in the rings for strength. -

    -

    +

    The aft centering ring and the one just aft of the zipperless coupler section were edge-drilled for the installation of brass 1/4-20 threaded inserts to hold rail buttons. The inserts were locked in place with epoxy, then ground down until nothing protruded beyond the OD of the ring. -

    Assembling the Booster Section

    +

    Assembling the Booster Section

    The forward two centering rings were installed on the MMT using JB Weld high-temperature epoxy, and incorporating an aircraft cable loop for recovery system retention since there just wasn't room for @@ -344,7 +349,7 @@ motor mount and zipperless-design coupler tubing was filled with epoxy and milled glass. Minor gaps in the airframe behind each fin were filled with epoxy clay. -

    Avionics Bay

    +

    Avionics Bay

    The avionics bay contains the two commercial altimeters used to record information about the flight and deploy the drogue and main recovery systems. It is constructed of a piece of Giant Leap 98mm @@ -409,7 +414,7 @@ formula for a bay over 100 cubic inches the answer is 0.261 inches. The closest standard drill size, which happens to split the difference, is 0.250 inches. Easy enough! -

    Payload Bay

    +

    Payload Bay

    The construction of the payload bay is very similar to the avionics bay, except that there is a hard-epoxied rear bulkhead, and only one screw ring to hard-mount the nose cone. The forward end of the @@ -417,7 +422,7 @@ anticipation of extending downlink antennas above the carbon fiber reinforcement in the coupler and into the nose cone, since carbon fiber is opaque to RF. -

    Recovery System

    +

    Recovery System

    Pre-sewn 1/4 inch tubular kevlar harness sections were purchased from Giant Leap, along with a small kevlar deployment bag and two kevlar chute protectors. @@ -429,7 +434,7 @@

    The main parachute will be sewn from 1.9 oz rip-stop nylon purchased from the - + Mill Outlet Fabric Shop in Colorado Springs. Using the spreadsheet from @@ -452,7 +457,7 @@ and its main charge at 900 feet. Thus the MAWD is primary and the miniRRC2 is the backup. Since the M1297W has a burn time of about 5 seconds, mach inhibit is programmed on both altimeters to 8 seconds. -

    Chapter 4. Recovery Systems Package

    Table of Contents

    Recovery System Description
    Recovery Initiation Control Components

    Recovery System Description

    +

    Chapter 4. Recovery Systems Package

    Table of Contents

    Recovery System Description
    Recovery Initiation Control Components

    Recovery System Description

    This rocket uses dual deployment.

    The apogee event separates the @@ -483,7 +488,7 @@ The anchor points are all 5/16 inch u-bolts, except for on the booster which is equipped with an embedded loop of 3/16 inch stainless aircraft cable. All connections are made with suitable quick-links. -

    Recovery Initiation Control Components

    +

    Recovery Initiation Control Components

    The LOC-style avionics bay between the main and drogue bays is populated with two commercial altimeters, a PerfectFlite MAWD and a Missile Works miniRRC2. @@ -548,7 +553,7 @@ the designers of this chute pattern, sanity checked using the descent rate tables of similar commercial parachute designs, like those from The Rocketman. -

    Chapter 5. Stability Evaluation

    +

    Chapter 5. Stability Evaluation

    Simulation using Rocksim v8 with a variety of motors showed that the rocket is unconditionally stable with all motors likely to be flown. The worst-case stability among 75mm motors is actually with the @@ -560,7 +565,7 @@ The smallest motor I can conceive of flying in this rocket (a Cesaroni J285) would leave us overstable with margin 3.79 on the way to about 1800 feet apogee. -

    Chapter 6. Expected Performance

    +

    Chapter 6. Expected Performance

    On the certification flight, using an Aerotech M1297W reload and associated hardware, the anticipated apogee is round 14,700 feet. This is just under 75% of the NCR North Site standing waiver of 20,000 feet. @@ -572,7 +577,7 @@ add description of anticipated flight profile here, including launch weight, estimated drag coefficient, velocity leaving the rail, max expected velocity, altitude, and acceleration -

    Chapter 7.  Checklists

    1. +

    Chapter 7.  Checklists

    1. Planning
      1. Pick a club launch with suitable waiver and facilities to @@ -754,7 +759,7 @@ gather up and roughly re-pack recovery system for return to flight line
      2. bring the rocket to observers for post-flight inspection -

    Chapter 8. Flight Summary

    +

    Chapter 8. Flight Summary

    YikStik was flown on an M1297W on Saturday morning at NCR's Oktoberfest 2008. The boost was beautiful. Unfortunately, we lost visual as the rocket climbed into high clouds near apogee. Radio tracking signals @@ -772,7 +777,7 @@

    Reward if returned posters were placed in the area during the week following the launch but have elicited no useful reponses yet. -

    Chapter 9. Analysis and Conclusions

    +

    Chapter 9. Analysis and Conclusions

    Consideration of how the nose cone ended up where it did suggests we may have had an apogee deployment of the main, perhaps due to stress on the shear pins before launch, during boost, or during diff --git a/rockets/projects/yikstik/launch-photos.mdwn b/rockets/projects/yikstik/launch-photos.mdwn deleted file mode 100644 index 23a227f..0000000 --- a/rockets/projects/yikstik/launch-photos.mdwn +++ /dev/null @@ -1 +0,0 @@ -[[!map pages="rockets/projects/yikstik/launch-photos/* and ! rockets/projects/yikstik/launch-photos/*/*"]] diff --git a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_IMG_9176.jpg b/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_IMG_9176.jpg deleted file mode 100644 index a1c238c..0000000 Binary files a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_IMG_9176.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3590.jpg b/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3590.jpg deleted file mode 100644 index f74ab2b..0000000 Binary files a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3590.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3667.jpg b/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3667.jpg deleted file mode 100644 index 0a91108..0000000 Binary files a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3667.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3668.jpg b/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3668.jpg deleted file mode 100644 index 58ccc40..0000000 Binary files a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3668.jpg and /dev/null differ diff --git a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3674.jpg b/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3674.jpg deleted file mode 100644 index 972bed7..0000000 Binary files a/rockets/projects/yikstik/launch-photos/NCR_10-4-08_BdaleGarby-YikstikL3Cert-M1297W_RL3_3674.jpg and /dev/null differ