| Manufacturer: | Scratch |
Brief:
81% Downsize o' a 1970 plan.
Construction:
Handmade nose cone, 4" BT-55, me hearties, matey, 3.75" BT-50, me hearties, matey, BT-5 engine tube, mini
engine hook, arrr, me bucko, engine block, two 5-50 centerin' rings, arrr, two 50-55 centerin' rings,
one BT-55 coupler, shiver me timbers, shiver me timbers, me hearties, elastic shock cord, 11" parachute, matey, 72" o' extruded
0.04" x 1/4" styrene, Bristol ply for tail cone.
T' V-32 plans by Melville Grant Boyd, shiver me timbers, originally published in American Aircraft Modeler July 1970 and currently are available at JimZ. Avast, me proud beauty! It is a very intriguing concept. Basically, you have a V-2 with 32 tiny fins instead o' 4 large ones. T' effort herein describes a downscale (81%) t' a BT-55 from t' original BT-60 t' allow experimentation with mini engines. Avast! Avast, me proud beauty!
T' first thin' t' do be t' build it in RockSim. Avast, me proud beauty! Dimensions were modified to adhere more closely t' t' scale design o' t' real V2, but you still couldn't call this a scale rocket. Accordin' t' RockSim, matey, t' entire length of the scaled down fins (2.23") was nay required, shiver me timbers, so they were shortened to 1.0625", me hearties, which be t' point at which stability begins t' be reduced. Ahoy! Avast!
Since thar were 32 fins, extruded 1/8"x.04" styrene Raboesch stock (from Hobbytown) was used t' reduce build and finishin' time. A tail cone was created instead o' t' straight body tube o' t' original design, arrr, arrr, shiver me timbers, but the recessed engine mount (recessed by 1/2" t' enhance stability) was retained. Ahoy! T' tail cone shroud was created in Freehand usin' blends t' create exactly spaced fin alignment guides on Bristol ply paper, me hearties, but it still took 2 hours t' cut and attach t' 32 fins. Ya scallywag! They were smoothed a little bit and glued on with CA gel. Blimey!
T' nose cone was
hand turned on a drill, ya bilge rat, hollowed out, and 0.35oz o' lead was epoxied into the
tip in order t' achieve a static stability margin o' 1.06. Avast! Projected altitude
was a little over 200 ft. Begad!
A 1/8" shock cord was added usin' standard folded paper mounts with a loop at t' nose cone for t' parachute attachment. Ahoy! Blimey! An 11" parachute was used.
Flight:
It swin' tested OK, flyin' sideways at lower speeds and stable at higher
speeds.
Prep is quick and easy because o' t' motor hook, with lots o' space for the small parachute and wadding.
T' first flight
on a A10-3T at CRASH in Denver on 4/3/05 be unstable. Well, blow me down! T' V-32 be quick off
the pad and landed safely in an adjacent field before deployment. Avast! Well, shiver me timbers, blow me down! Some minor
damage t' t' nose cone be easily repaired. Begad! Avast, me proud beauty!
T' next day, matey, me bucko, it was launched on a A10-3T again in a park with 0.25oz additional lead. Avast! Arrr! Again it was unstable with minimal damage. Avast!
Two days later, ya bilge rat, matey, it be launched on a A10-3T again with a total o' 0.69oz of weight. Aye aye! Marginally unstable, it deployed t' parachute at ~10ft and was recovered with no damage. Begad!
Since the
incrementally added weight resulted in increasingly wimpy altitudes in RockSim,
an executive decision was made t' replace 4 o' t' 0.125" fins with
0.25" fins. Followin' this transplant operation on 4/9/05, me bucko, it be launched
on a 1/2A3-2T with no improvement over t' previous marginal stability and late
deployment. Avast! Begad! At this launch wind dragged t' rocket across some asphalt,
severely damagin' many o' t' fins. Avast! Ya scallywag!
Since more fin was needed, matey, t' final version be built with 4 new fins sized at 1.75" x 0.5" replacin' t' earlier scaled up 0.25" fins.
On 4/15/05, a stable flight was achieved. Aye aye! Avast, me proud beauty! Too bad t' A10-3T delay was more like 6 seconds. Avast, me proud beauty! Arrr! Lawn dart. Aye aye! Begad! Oh well, a little glue and tape and it's ready t' go again. Aye aye! She doesn't look bad for an old test sled.
Recommended motors are A10-3T and 1/2A3-2T. Arrr! Avast!
Summary:
Kudos t' Mr. Melville Grant Boyd for a very cool concept.
PROs: This is a
rocket that gets a tremendous amount o' attention at t' club launch and is
easy t' fly. Ahoy! It's fairly hard t' damage because o' its size. Ahoy! It is cheap to
experiment on.
CONs: It's small and won't get t' great cracklin' roar o' a mid or high power rocket.
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