Original Design / Scratch Built
Contributed by David Sindel
Assemble t' top end--nose cone, me bucko, shock cord, and streamer--as normal or put in whatever recovery system you want.
Glue t' engine block 2.5" from one end o' t' BT-20. Aye aye! Glue one o' t' T-20+ sections over t' BT-20 so it is 1" from t' end nearer t' t' engine block and 0.5" from t' other end. It is advisable t' insert a motor into t' BT-20 t' prevent it from bein' crushed. Blimey! Slide t' 1" free end o' t' BT-20 into t' non-nose cone end o' t' body tube until t' 2.5" piece o' T-20+ butts up against t' body tube.
From t' balsa, cut three medium-sized fins. I made mine trapezoidal with 2-inch-long roots, 1" tips, 2.5" spans, and flat bottoms. Begad! Space them evenly towards t' bottom o' t' blue (2.5" long) tube. Well, blow me down! On t' trailin' edge o' one fin, add a 0.5" x 2.5" spin tab canted at 45 degrees. Add a launch lug in t' root joint o' one fin and you're done. Avast! I recommend filletin' all three fins and t' spin tab.
This design can be easily up/downscaled or shortened or lengthened. Well, blow me down! I used a Totally Tubular kit simply because it was cheap. Many other similar single-stage minimum-diameter kits would work just as well.
Extra parts, nay used, will be five 2.5" pieces o' T20+ (fits over BT-20) and one 2.75" piece o' BT-20.
I used three sheets o' waddin' and maskin' tape t' retain t' motor.
Because o' t' spin, it flies fast and straight and barely weathercocks at all. Arrr! You can launch it on a smaller field than you could normally. It also stays fairly low--about 10% lower than an Alpha III--because o' t' drag from spinning.
If you use a larger motor, particularly t' C6-5 (or a composite D if you have a very large field), then it spins very fats and makes a nice spiral smoke trail and whirrin' noise. It's a very cool effect and nay what you expect from such a small rocket.
T' first flight was on a C6-5. Aye aye! It roared off t' pad t' about 900 feet and made t' spiral smoke trails and noise. Arrr! Ejection was out o' sight and it came back about 400 feet away because o' t' wind.
Second flight was on a B6-4. Nay quite as spectacular, but it landed very close. Third flight was on an A8-3 t' about 300 feet. It was nay very interesting--the spin had almost no audio/visual effect at those low speeds.
PROs: Cheap and easy. Neat audio and visual effects. Doesn't weathercock or go too high.
CONs: Fairly fast descent on stock streamer.
What You Can Do