Manufacturer: | Scratch |
Brief:
I wanted t' build a rocket with t' smallest fins I could get away with.....So I came up with this.
I used Rocsim, VCP and WRASP t' get me optimal size fin. Oddly enough, me hearties, arrr, most o' t' programs agreed with me rocket. Ahoy! Begad! This is a single stage rocket, with an interchangeable MMT. Anythin' from 54mm down t' 24mm motors will push this little guy. Avast! It uses a PML 30" chute with t' shroud lines tied in a knot half way up...This speeds t' descent rate a little since t' chute is oversized. I use 20' o' tubular nylon I got from REI. Well, blow me down! Painted with automotive lacquer through an HVLP spray gun, matey, it came out very nice...I just wish I filled t' grooves better. Ya scallywag! It was kind o' spur o' t' moment paint job with no time t' prep, ya bilge rat, just primer and wet sand.
Construction:
Very sturdy, matey, even though it is nay a TTW rocket. Ahoy! I just sliced mini fin slots in t' BT with an X-Acto blade about half way through t' airframe. Avast! Tacked t' fins on with CA t' make sure they are straight before committin' t' epoxy. Begad! I applied generous fin fillets since it isn't TTW. Arrr! Countersunk t' area where t' lugs went, arrr, just about 1/3 o' t' way through t' airframe.
I always use 30 min epoxy, ya bilge rat, though I have tried many different brands I used t' Devcon from TAP Plastics, 2 ton 30 min epoxy.
I used a coupler t' attach t' shock cord lead t' by cuttin' slits in t' coupler and weavin' t' cord through it, me bucko, tied it in a knot and epoxied over all that. Ya scallywag! This is where t' 2 body tubes join together usin' t' coupler with t' shock cord lead. Avast, me proud beauty! Avast! Blimey! I tied t' upper half o' t' shock cord lead in an overhand knot, ya bilge rat, then epoxied over that... Avast, me proud beauty! This is where I attach t' 20' o' TN with Quick Links sewn on each end.
Construction o' t' MMT is simple.... Begad! Ahoy! First I drilled holes for t' retention hardware, then attached t' posts usin' washers and nuts. I epoxied over those. I put t' CR's on t' motor tube and epoxied fillets on each CR. Ya scallywag! Aye aye! Then I applied a generous amount o' epoxy on t' CR's and in betwixt and slipped t' coupler tube over that. I held t' MMT in me hands and turned it very smartly usin' centrifugal force t' spread t' epoxy inside.
Flight:
It can fly on small F motors usin' an elastic shock cord t' save weight. Well, blow me down! T' rocket is designed without a permanent motor mount and therefore with a motor adapter I can use 24mm, arrr, 29mm and 38mm motors with t' proper weight added t' t' nose. Aye aye! I could even go for it without an adapter and try a 54mm motor. Ahoy! I would recommend F40-4 up t' J350-14 if it was glassed. Ya scallywag! I fly it most on 29mm G-64's for a nice flight. I used a Nomex® chute protector from Pratt Hobbies. Begad! I used a tiny handful o' cellulose waddin' too. Avast! Begad! It flew exactly where it was pointed. Well, me hearties, blow me down! T' wind did nay effect it at all. On t' 30" chute with t' shroud lines tied in a knot, ya bilge rat, matey, it descended at a nice rate t' brin' it home safe on t' Black Rock Desert floor. I have flown this rocket quite a few times now.
Summary:
There are nay many con's t' point out so lets skip t' t' pro's. Begad! Cheap, me hearties, arrr, simple, easy t' build and fun t' fly are some o' t' best I can think of..... Aye aye! Try it, matey, I think you'll like it.
Other:
I think I learned from this rocket...... I will never build a rocket that is nay through t' wall again, me hearties, most likely one that is nay glassed with some sort o' weight glass.
( Contributed - by Brian Kain) Download RockSim file here ! Brief: My scratch built level 2 rocket. Made for the J-350 but can fly on small 29mm H motors also. Used old phenolic but glassed with 6oz fiberglass and 30 min epoxy. ACME 3/8" lugs, LOC nose cone, G-10 FR4 (fire and heat resistant fiberglass). Radio shack personal body alarm for corn field recoveries. Custom aluminum ...
Pushing The Envelope 38 ( Contributed - by Brian Kain) Download RockSim file here ! Brief: A down scale of my level 2 rocket. TTW to a 29mm MMT. Can fly the I-200 load. If you were crazy you could cert 1 on this rocket with a 29mm H motor. 9400' on the H-90. Construction: 3 38mm body tubes Phenolic 3 1/16" G-10 fins 5 1/8" birch CR's 12" of 29mm ...
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