only considered safe to launch from Terry Lee's launch trailer with 20 feet
of very stiff 1515 rail.
+### Revisions for Version 2 ###
+
+Because the main airframe zippered somewhat on the first flight, and the
+ARRD released at apogee, rather than just repairing the existing airframe
+tube, we're going to build a replacement.
+
+To increase stability, the main airframe tube length will be extended from
+the original 4.5 feet to approximately 8 feet. The expected increase
+in stability should allowing a reduction in nose weight, increasing safety.
+It should also make recovery system loading less arduous on the rail. Of
+course, this means the rocket will be closer to the length of an upscaled
+Nuke Pro Maxx rather than the original Lil Nuke.
+
+For main deployment, the ARRD is being replaced with a
+[Tender Descender L3](https://tinderrocketry.com/l13-tender-descender-tether),
+which has the advantage that the release mechanism is orthogonal to the
+axis of flight. That seems important when the airframe is this heavy and
+apogee occurs at a non-nominal velocity, as in the first flight.
+
+The original build had internal 1x2 ribs and a baffle yielding a "D" shaped
+main bay with the apogee charge gasses going up the channel without pushing
+on the main deployment bag. For this rebuild, 3 ribs will run the airframe
+length between the 12" airframe and a concentric full-length 8" deployment
+bay, with centering rings on each end. One sector of the rings will be
+vented to allow apogee ejection gasses to flow from the charge cups on the
+leading edge of the fin can to push the nose off without push up on the
+main in its deployment bag.
+
## Design / Simulation File
-[mehganuke.ork](/rockets/airframes/MehGaNuke/mehganuke.ork)
+Original [mehganuke.ork](/rockets/airframes/MehGaNuke/mehganuke.ork)
+Revised [mehganuke-v2.ork](/rockets/airframes/MehGaNuke/mehganuke-v2.ork)
## Construction Log
about the main deployment sequence, several changes will be made before the
next flight:
- - The main airframe tube will be replaced with a tube that's a bit longer (for greater stability), and has an internal 7.5-8" diameter tube instead of the flat baffle to ease main chute deployment.
+ - The main airframe tube will be replaced with a tube that's a bit longer
+ (for greater stability), and has an internal 7.5-8" diameter tube instead
+ of the flat baffle to ease main chute deployment.
- - Switch from the ARRD to the largest [Tender Descender](http://www.tinderrocketry.com/l13-tender-descender-tether) for main deployment
+ - Switch from the ARRD to the largest [Tender Descender](http://www.tinderrocketry.com/l13-tender-descender-tether) for main deployment.
- - Add a TeleGPS to the nose assembly so it can be tracked independently, and let it come down under the 2 existing 5-foot chutes. Add a third 5-foot chute to be a dedicated pilot for the 28-foot main chute.
+ - Add a TeleGPS to the nose assembly so it can be tracked independently, and let
+ it come down by itself under the 2 existing 5-foot chutes. Add a third 5-foot
+ chute to be a dedicated pilot for the 28-foot main chute.
These changes should reduce the chance of another zipper, and reduce the amount
of strap we need to stuff into the bay.
projects / web / gag.com / blobdiff