-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>YikStik</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="book" lang="en"><div class="titlepage"><div><div><h1 class="title"><a name="id2
747760"></a>YikStik</h1></div><div><h2 class="subtitle">A NAR L3 Certification Rocket</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Bdale</span> <span class="surname">Garbee</span></h3></div></div><div><p class="copyright">Copyright © 2008 Bdale Garbee</p></div><div><div class="legalnotice"><a name="id3003123"></a><p>
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>YikStik</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="book" lang="en"><div class="titlepage"><div><div><h1 class="title"><a name="id2
322390"></a>YikStik</h1></div><div><h2 class="subtitle">A NAR L3 Certification Rocket</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Bdale</span> <span class="surname">Garbee</span></h3></div></div><div><p class="copyright">Copyright © 2008 Bdale Garbee</p></div><div><div class="legalnotice"><a name="id2577753"></a><p>
This document is released under the terms of the
<a class="ulink" href="http://creativecommons.org/licenses/by-sa/3.0/" target="_top">
Creative Commons ShareAlike 3.0
</a>
license.
- </p></div></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="2"><b>Revision History</b></th></tr><tr><td align="left">Revision 1.1</td><td align="left">5 December 2008</td></tr><tr><td align="left" colspan="2">
+ </p></div></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="2"><b>Revision History</b></th></tr><tr><td align="left">Revision 1.2</td><td align="left">12 January 2009</td></tr><tr><td align="left" colspan="2">
+ Document firmware bug in miniRRC2 and possible impact on flight.
+ </td></tr><tr><td align="left">Revision 1.1</td><td align="left">5 December 2008</td></tr><tr><td align="left" colspan="2">
Remove embedded images in favor of references to gallery.gag.com
</td></tr><tr><td align="left">Revision 1.0</td><td align="left">28 October 2008</td></tr><tr><td align="left" colspan="2">
Recording results of first, and only, flight attempt.
Documenting the build process as it happens
</td></tr><tr><td align="left">Revision 0.3</td><td align="left">29 March 2008</td></tr><tr><td align="left" colspan="2">
Incorporate ideas from James Russell during initial L3CC review
- </td></tr><tr><td align="left">Revision 0.2</td><td align="left">27 March 2008</td></tr><tr><td align="left" colspan="2">Cleaned up for initial review</td></tr><tr><td align="left">Revision 0.1</td><td align="left">16 March 2008</td></tr><tr><td align="left" colspan="2">Initial content</td></tr></table></div></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="chapter"><a href="#id2
990893">1. Introduction</a></span></dt><dd><dl><dt><span class="section"><a href="#id2990929">Why "YikStik"?</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id2982562">2. Design</a></span></dt><dd><dl><dt><span class="section"><a href="#id2982567">Overview</a></span></dt><dt><span class="section"><a href="#id2982585">Rocksim File</a></span></dt><dt><span class="section"><a href="#id2982598">Drawing from Rocksim</a></span></dt><dt><span class="section"><a href="#id2982615">Airframe Tubing</a></span></dt><dt><span class="section"><a href="#id2982631">Nose Cone</a></span></dt><dt><span class="section"><a href="#id2982642">Fins</a></span></dt><dt><span class="section"><a href="#id3034040">Centering Rings and Bulkheads </a></span></dt><dt><span class="section"><a href="#id3022808">Motor Retention</a></span></dt><dt><span class="section"><a href="#id3024901">Electronics</a></span></dt><dd><dl><dt><span class="section"><a href="#id3037919">Avionics</a></span></dt><dt><span class="section"><a href="#id3014459">Payload</a></span></dt></dl></dd><dt><span class="section"><a href="#id3007021">Stability Evaluation</a></span></dt><dt><span class="section"><a href="#id3006816">Expected Performance</a></span></dt><dt><span class="section"><a href="#id3024444">Recovery System</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id3017603">3. Construction Details</a></span></dt><dd><dl><dt><span class="section"><a href="#id3036294">Airframe and Couplers</a></span></dt><dt><span class="section"><a href="#id3013772">Fins</a></span></dt><dt><span class="section"><a href="#id3035882">Centering Rings and Bulkheads</a></span></dt><dt><span class="section"><a href="#id3018547">Assembling the Booster Section</a></span></dt><dt><span class="section"><a href="#id3002568">Avionics Bay</a></span></dt><dt><span class="section"><a href="#id3016980">Payload Bay</a></span></dt><dt><span class="section"><a href="#id3019009">Recovery System</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id3014086">4. Recovery Systems Package</a></span></dt><dd><dl><dt><span class="section"><a href="#id3027839">Recovery System Description</a></span></dt><dt><span class="section"><a href="#id3031067">Recovery Initiation Control Components</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id3032704">5. Stability Evaluation</a></span></dt><dt><span class="chapter"><a href="#id3033520">6. Expected Performance</a></span></dt><dt><span class="chapter"><a href="#id3037662">7. Checklists </a></span></dt><dt><span class="chapter"><a href="#id3004103">8. Flight Summary</a></span></dt><dt><span class="chapter"><a href="#id3028762">9. Analysis and Conclusions</a></span></dt></dl></div><p>
+ </td></tr><tr><td align="left">Revision 0.2</td><td align="left">27 March 2008</td></tr><tr><td align="left" colspan="2">Cleaned up for initial review</td></tr><tr><td align="left">Revision 0.1</td><td align="left">16 March 2008</td></tr><tr><td align="left" colspan="2">Initial content</td></tr></table></div></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="chapter"><a href="#id2
565537">1. Introduction</a></span></dt><dd><dl><dt><span class="section"><a href="#id2565574">Why "YikStik"?</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id2557207">2. Design</a></span></dt><dd><dl><dt><span class="section"><a href="#id2557213">Overview</a></span></dt><dt><span class="section"><a href="#id2557231">Rocksim File</a></span></dt><dt><span class="section"><a href="#id2557244">Drawing from Rocksim</a></span></dt><dt><span class="section"><a href="#id2557261">Airframe Tubing</a></span></dt><dt><span class="section"><a href="#id2557277">Nose Cone</a></span></dt><dt><span class="section"><a href="#id2557288">Fins</a></span></dt><dt><span class="section"><a href="#id2608670">Centering Rings and Bulkheads </a></span></dt><dt><span class="section"><a href="#id2597438">Motor Retention</a></span></dt><dt><span class="section"><a href="#id2599532">Electronics</a></span></dt><dd><dl><dt><span class="section"><a href="#id2612550">Avionics</a></span></dt><dt><span class="section"><a href="#id2589090">Payload</a></span></dt></dl></dd><dt><span class="section"><a href="#id2581651">Stability Evaluation</a></span></dt><dt><span class="section"><a href="#id2581446">Expected Performance</a></span></dt><dt><span class="section"><a href="#id2599074">Recovery System</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id2592234">3. Construction Details</a></span></dt><dd><dl><dt><span class="section"><a href="#id2599259">Airframe and Couplers</a></span></dt><dt><span class="section"><a href="#id2596433">Fins</a></span></dt><dt><span class="section"><a href="#id2606804">Centering Rings and Bulkheads</a></span></dt><dt><span class="section"><a href="#id2588775">Assembling the Booster Section</a></span></dt><dt><span class="section"><a href="#id2584973">Avionics Bay</a></span></dt><dt><span class="section"><a href="#id2606384">Payload Bay</a></span></dt><dt><span class="section"><a href="#id2607348">Recovery System</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id2600260">4. Recovery Systems Package</a></span></dt><dd><dl><dt><span class="section"><a href="#id2595964">Recovery System Description</a></span></dt><dt><span class="section"><a href="#id2609782">Recovery Initiation Control Components</a></span></dt></dl></dd><dt><span class="chapter"><a href="#id2585586">5. Stability Evaluation</a></span></dt><dt><span class="chapter"><a href="#id2606777">6. Expected Performance</a></span></dt><dt><span class="chapter"><a href="#id2611290">7. Checklists </a></span></dt><dt><span class="chapter"><a href="#id2610811">8. Flight Summary</a></span></dt><dt><span class="chapter"><a href="#id2607490">9. Analysis and Conclusions</a></span></dt></dl></div><p>
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!
- </p><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id2
990893"></a>Chapter 1. Introduction</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2990929">Why "YikStik"?</a></span></dt></dl></div><p>
+ </p><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id2
565537"></a>Chapter 1. Introduction</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2565574">Why "YikStik"?</a></span></dt></dl></div><p>
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.
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.
- </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
990929"></a>Why "YikStik"?</h2></div></div></div><p>
+ </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
565574"></a>Why "YikStik"?</h2></div></div></div><p>
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.
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.
- </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id2
982562"></a>Chapter 2. Design</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2982567">Overview</a></span></dt><dt><span class="section"><a href="#id2982585">Rocksim File</a></span></dt><dt><span class="section"><a href="#id2982598">Drawing from Rocksim</a></span></dt><dt><span class="section"><a href="#id2982615">Airframe Tubing</a></span></dt><dt><span class="section"><a href="#id2982631">Nose Cone</a></span></dt><dt><span class="section"><a href="#id2982642">Fins</a></span></dt><dt><span class="section"><a href="#id3034040">Centering Rings and Bulkheads </a></span></dt><dt><span class="section"><a href="#id3022808">Motor Retention</a></span></dt><dt><span class="section"><a href="#id3024901">Electronics</a></span></dt><dd><dl><dt><span class="section"><a href="#id3037919">Avionics</a></span></dt><dt><span class="section"><a href="#id3014459">Payload</a></span></dt></dl></dd><dt><span class="section"><a href="#id3007021">Stability Evaluation</a></span></dt><dt><span class="section"><a href="#id3006816">Expected Performance</a></span></dt><dt><span class="section"><a href="#id3024444">Recovery System</a></span></dt></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2982567"></a>Overview</h2></div></div></div><p>
+ </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id2
557207"></a>Chapter 2. Design</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2557213">Overview</a></span></dt><dt><span class="section"><a href="#id2557231">Rocksim File</a></span></dt><dt><span class="section"><a href="#id2557244">Drawing from Rocksim</a></span></dt><dt><span class="section"><a href="#id2557261">Airframe Tubing</a></span></dt><dt><span class="section"><a href="#id2557277">Nose Cone</a></span></dt><dt><span class="section"><a href="#id2557288">Fins</a></span></dt><dt><span class="section"><a href="#id2608670">Centering Rings and Bulkheads </a></span></dt><dt><span class="section"><a href="#id2597438">Motor Retention</a></span></dt><dt><span class="section"><a href="#id2599532">Electronics</a></span></dt><dd><dl><dt><span class="section"><a href="#id2612550">Avionics</a></span></dt><dt><span class="section"><a href="#id2589090">Payload</a></span></dt></dl></dd><dt><span class="section"><a href="#id2581651">Stability Evaluation</a></span></dt><dt><span class="section"><a href="#id2581446">Expected Performance</a></span></dt><dt><span class="section"><a href="#id2599074">Recovery System</a></span></dt></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2557213"></a>Overview</h2></div></div></div><p>
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,
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2982585"></a>Rocksim File</h2></div></div></div>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2557231"></a>Rocksim File</h2></div></div></div>
This is the current working design in Rocksim format:
- <a class="ulink" href="YikStik.rkt" target="_top"> YikStik.rkt </a></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
982598"></a>Drawing from Rocksim</h2></div></div></div><span class="inlinemediaobject"><img src="YikStik.jpg"></span></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2982615"></a>Airframe Tubing</h2></div></div></div><p>
+ <a class="ulink" href="YikStik.rkt" target="_top"> YikStik.rkt </a></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
557244"></a>Drawing from Rocksim</h2></div></div></div><span class="inlinemediaobject"><img src="YikStik.jpg"></span></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2557261"></a>Airframe Tubing</h2></div></div></div><p>
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
982631"></a>Nose Cone</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
557277"></a>Nose Cone</h2></div></div></div><p>
I intend to use a Giant Leap "Pinnacle" 3.9 inch nose cone.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
982642"></a>Fins</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2
557288"></a>Fins</h2></div></div></div><p>
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,
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3034040"></a>Centering Rings and Bulkheads </h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2608670"></a>Centering Rings and Bulkheads </h2></div></div></div><p>
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3022808"></a>Motor Retention</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2597438"></a>Motor Retention</h2></div></div></div><p>
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3024901"></a>Electronics</h2></div></div></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id3037919"></a>Avionics</h3></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2599532"></a>Electronics</h2></div></div></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2612550"></a>Avionics</h3></div></div></div><p>
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.
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id
3014459"></a>Payload</h3></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id
2589090"></a>Payload</h3></div></div></div><p>
I hope to fly
<a class="ulink" href="http://altusmetrum.org/" target="_top">
my own altimeter design
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.
- </p></div></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3007021"></a>Stability Evaluation</h2></div></div></div><p>
+ </p></div></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2581651"></a>Stability Evaluation</h2></div></div></div><p>
This design has been thoroughly analyzed using
<a class="ulink" href="http://www.apogeerockets.com/rocksim.asp" target="_top">
RockSim
</p><p>
These simulations will be refined as the build proceeds and as-built
stability verified before flight.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3006816"></a>Expected Performance</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2581446"></a>Expected Performance</h2></div></div></div><p>
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
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".
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3024444"></a>Recovery System</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2599074"></a>Recovery System</h2></div></div></div><p>
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,
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.
- </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3017603"></a>Chapter 3. Construction Details</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id3036294">Airframe and Couplers</a></span></dt><dt><span class="section"><a href="#id3013772">Fins</a></span></dt><dt><span class="section"><a href="#id3035882">Centering Rings and Bulkheads</a></span></dt><dt><span class="section"><a href="#id3018547">Assembling the Booster Section</a></span></dt><dt><span class="section"><a href="#id3002568">Avionics Bay</a></span></dt><dt><span class="section"><a href="#id3016980">Payload Bay</a></span></dt><dt><span class="section"><a href="#id3019009">Recovery System</a></span></dt></dl></div><p>
+ </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2592234"></a>Chapter 3. Construction Details</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2599259">Airframe and Couplers</a></span></dt><dt><span class="section"><a href="#id2596433">Fins</a></span></dt><dt><span class="section"><a href="#id2606804">Centering Rings and Bulkheads</a></span></dt><dt><span class="section"><a href="#id2588775">Assembling the Booster Section</a></span></dt><dt><span class="section"><a href="#id2584973">Avionics Bay</a></span></dt><dt><span class="section"><a href="#id2606384">Payload Bay</a></span></dt><dt><span class="section"><a href="#id2607348">Recovery System</a></span></dt></dl></div><p>
I have collected all of my
<a class="ulink" href="http://gallery.gag.com/rockets/yikstik" target="_top">
build photos
</a>
in one place, they may show better than I can explain how various
aspects of YikStik went together.
- </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3036294"></a>Airframe and Couplers</h2></div></div></div><p>
+ </p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2599259"></a>Airframe and Couplers</h2></div></div></div><p>
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.
after reinforcing to get "perfect" ends. The technique worked
marvelously otherwise, and the resulting couplers look and should work
great!
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3013772"></a>Fins</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2596433"></a>Fins</h2></div></div></div><p>
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
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3035882"></a>Centering Rings and Bulkheads</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2606804"></a>Centering Rings and Bulkheads</h2></div></div></div><p>
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
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3018547"></a>Assembling the Booster Section</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2588775"></a>Assembling the Booster Section</h2></div></div></div><p>
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
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3002568"></a>Avionics Bay</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2584973"></a>Avionics Bay</h2></div></div></div><p>
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
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!
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3016980"></a>Payload Bay</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2606384"></a>Payload Bay</h2></div></div></div><p>
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
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3019009"></a>Recovery System</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2607348"></a>Recovery System</h2></div></div></div><p>
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.
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.
- </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3014086"></a>Chapter 4. Recovery Systems Package</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id3027839">Recovery System Description</a></span></dt><dt><span class="section"><a href="#id3031067">Recovery Initiation Control Components</a></span></dt></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id3027839"></a>Recovery System Description</h2></div></div></div><p>
+ </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2600260"></a>Chapter 4. Recovery Systems Package</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="#id2595964">Recovery System Description</a></span></dt><dt><span class="section"><a href="#id2609782">Recovery Initiation Control Components</a></span></dt></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2595964"></a>Recovery System Description</h2></div></div></div><p>
This rocket uses dual deployment.
</p><p>
The apogee event separates the
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.
- </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
3031067"></a>Recovery Initiation Control Components</h2></div></div></div><p>
+ </p></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id
2609782"></a>Recovery Initiation Control Components</h2></div></div></div><p>
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.
the designers of this chute pattern, sanity checked using the descent
rate tables of similar commercial parachute designs, like those from
The Rocketman.
- </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3032704"></a>Chapter 5. Stability Evaluation</h2></div></div></div><p>
+ </p></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2585586"></a>Chapter 5. Stability Evaluation</h2></div></div></div><p>
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
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.
- </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3033520"></a>Chapter 6. Expected Performance</h2></div></div></div><p>
+ </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2606777"></a>Chapter 6. Expected Performance</h2></div></div></div><p>
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.
add description of anticipated flight profile here, including launch
weight, estimated drag coefficient, velocity leaving the rail, max
expected velocity, altitude, and acceleration
- </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3037662"></a>Chapter 7. Checklists </h2></div></div></div><div class="orderedlist"><ol type="1"><li>
+ </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2611290"></a>Chapter 7. Checklists </h2></div></div></div><div class="orderedlist"><ol type="1"><li>
Planning
<div class="orderedlist"><ol type="1"><li>
Pick a club launch with suitable waiver and facilities to
gather up and roughly re-pack recovery system for return to flight line
</li><li>
bring the rocket to observers for post-flight inspection
- </li></ol></div></li></ol></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3004103"></a>Chapter 8. Flight Summary</h2></div></div></div><p>
+ </li></ol></div></li></ol></div></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2610811"></a>Chapter 8. Flight Summary</h2></div></div></div><p>
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
</p><p>
Reward if returned posters were placed in the area during the week
following the launch but have elicited no useful reponses yet.
- </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
3028762"></a>Chapter 9. Analysis and Conclusions</h2></div></div></div><p>
+ </p></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="id
2607490"></a>Chapter 9. Analysis and Conclusions</h2></div></div></div><p>
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
construction skills are adequate to attain an L3 cert.
While I hope to recover the remainder of YikStik someday, I won't
waste any time before trying again with a new airframe!
+ </p><p>
+ [update] We have learned that one of the altimeters used in this
+ flight, the Missile Works miniRRC2, was subject to a fault in
+ firmware that could cause premature ejection of the main
+ in flights above 10k feet. Thus, it now seems even more likely
+ that we sustained an apogee ejection of the main, but that it
+ may well have been through no fault of the rocket's design,
+ construction, or preparation. Frustrating!
</p></div></div></body></html>
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