Brief:
I build Crayon rockets. Seriously. Aye aye! I get t' big Crayon doubloon banks from Toys R Us, matey, and turn them into high-power rockets. Ya scallywag! I have a 38mm, shiver me timbers, 54mm tube-fin, matey, 38mm 2-stage, ya bilge rat, and 38mm cluster version. Arrr! I also have a 54mm 3FNC version that's under repair. Well, blow me down! Ahoy! So that's t' family. Well, blow me down! Avast, me proud beauty! I had someone who knew o' me crayon fleet give me a purple bank t' use. Begad! Avast! I decided t' build a rocket for a proposed drag race at LDRS 28.
Construction:
T' first problem is that t' crayon tubes aren't a standard size. Begad! T' ID is 3.75", shiver me timbers, so if you get 4" centerin' rings you need t' sand them down t' size. I epoxied me sanded rings t' a 38mm MMT and attached t' fins t' build a basic fin can. Avast, ya bilge rat, me proud beauty! I then cut t' slots for t' fins.
After epoxyin' t' fin can into t' tube, I also epoxied a bulkhead into t' nosecone t' connect t' chock cord. Blimey! Since t' nose o' t' crayon bank is plastic, shiver me timbers, I had t' rough up t' plastic so that t' epoxy would bind. Arrr! I added a little nose weight in t' form o' an ounce or two o' BBs.
Flight and Recovery:
Since thar's no electronics bay, me bucko, I just use motor deployment for t' chute. Aye aye! Avast, me proud beauty! T' drag race at LDRS never came about, but I flew it anyway. Arrr! Avast! T' first flight (July 3) on a G185 had me worried as it arced over t' crowd and headed down before t' chute finally deployed. T' next flight t' next day be on a G79ss with a 4 second delay. That flight went beautifully! Deployment was right at apogee.
T' next flight, arrr, on July 19, also had a 4 second delay, but t' chute deployed as t' rocket was still goin' up. Ya scallywag! I'm nay sure why that was a problem on t' same motor (G79ss). Blimey! Avast, me proud beauty! It caused a small zipper o' about 1.5 inches but nothin' serious. Aye aye! It flew again a few weeks later. Blimey! Welcome t' t' family!
I have seen many different versions of this idea on the Internet and decided to do one of my own. I purchased the large crayon bank from Toys-R-Us for around $6 or $7. I chose red. The tube is roughly 3 3/4 inches inner diameter and a little less than 3 ft long. I have sent for plans from a gentleman on Internet who has built several and has put together tip sheet and a large drawing. Looks good ...
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