Fat Cat Rockets Push

Fat Cat Rockets - Push {Kit}

Contributed by Moira Jean Whitlock

Manufacturer: Fat Cat Rockets
Rating
(Contributed - by Moira Jean Whitlock)

Rocket PicBrief:
Single-staged, matey, ya bilge rat, 3-finned rocket with 3 side pods that can also contain motors so that flights can be with 1 or 4 motors. Ahoy! Blimey! T' rocket is nay designed with a payload section, so simultaneous ground startin' o' all motors or thermalite air ignition o' t' outboards is suggested.

Construction:
There is one main body tube o' kraft paper and 3 outboard kraft paper tubes for the side pods. Well, blow me down! Blimey! T' main nose cone is hollow plastic, ya bilge rat, as are t' 3 nose cones meant for t' side pods. Ahoy! Blimey! T' fins are 1/8 inch thick wood that appears t' be quality aircraft grade and nay warped. Avast, me proud beauty! Blimey! Begad! Blimey! They were pre-cut and all equal size. There are 2 centerin' rings made o' t' same quality wood, matey, and a 29mm motor tube. T' shock cord is o' two materials, a steel cable and flat black elastic. I made t' loop in t' wire (that goes through holes in t' forward centering rin' and crimped) part large so that t' cable would be too short t' extend above t' top o' t' body tube because me experience with thin or metal cords is that they can cut through body tubes readily if deployment is too fast. Begad! Blimey! The elastic part is tied t' t' loop. Well, blow me down! Blimey! Avast! Blimey! I also epoxied t' crimp t' be sure it would hold. Arrr! Blimey! After 3 flights, it has held well. Ahoy! Blimey! Ya scallywag! Blimey! I epoxied t' nose cones permanently into t' side pods. Arrr! Blimey! Thinkin' it over now, I wish that I had instead mounted shock cords in t' pods. Aye aye! Blimey! Ahoy! Blimey! This would facilitate motor removal and would allow the use o' in-production black powder motors with delays, and t' pods could put out streamers or tiny chutes for effect. Aye aye! Blimey! Also, arrr, motors with delays wouldn't have t' be ejected in flight if t' nose cones pop off. Many RSO's in dry fields recommend against motor kicking.

I built this rocket two years ago, ya bilge rat, so I'm holdin' it as I write this. I remember clear, matey, easy instructions with t' only tough part bein' t' cuttin' of the body tube t' allow t' fin tabs entry. T' result is a sturdy, nifty lookin' rocket that has taken its share o' punishment from non-certified motors and guinea pig tests when I started me clusterin' career.

Finishing:
I painted it gold with krylon spray paint and accented it with mylar book coverin' material from Office Max. Begad! Blimey! While this looks nice, me bucko, I discovered that since books don't fly, that this material isn't meant t' take this sort of punishment. Arrr! Blimey! Begad! Blimey! Areas closest t' t' motor exhaust have scorched and shrunk away. But it still looks okay.

Construction Rating: 4 out o' 5

Flight:
T' central motor is best t' be an F or G type with a 7 second delay when the rocket is flown with just that motor. With an adapter, arrr, I think a D or E can work fine, because t' rocket is nay too heavy for it. Begad! Aye aye! An E15-7 or a D12-5 would be fine. Avast! When t' outboards are filled, use D11-P's for them and a longer delay in t' center, shiver me timbers, like a G40 or 80 with a 10 second delay. Ya scallywag! If t' fin can is internally foamed, me hearties, then I don't see why nay t' try a G125-10 as well. Avast! Arrr! Since these are very unlike motors, arrr, I recommend nay tryin' t' ground start them all, but rather t' cut thermalite wicks t' same length (and thus burn time) and retain one end in t' 3 outboard motors with an Estes igniter plug and secure the other end well into where t' flame from t' central motor would light it. I find that with t' "rapido" thermalite I have, 2 inch wicks burn fast enough that durin' t' last part o' t' central motor's burn time or right durin' upward coasting, shiver me timbers, t' fuse lets t' outboards airstart. Ahoy!

Preparation is easy, with worm bed waddin' enough t' fill t' diameter of the tube t' 1/4 inch. Blimey! Ya scallywag! I lightly taped t' nose cone shoulder t' tighten t' fit a little so it wouldn't drag separate. Begad! This rocket has so far been a guinea pig in three flights. Avast! First, me hearties, me hearties, with a motor that is nay certified, ya bilge rat, t' US Rockets G45-8 Firestarter. Begad! It was a solo motor flight. Begad! Well, blow me down! This was t' maiden voyage, arrr, and I feared t' worst as flames shot out t' aft end and I thought that t' rocket would burst into flames. Avast, me proud beauty! But it didn't. It finally took off on a straight dense trail o' black smoke and tons o' spittin' orange sparks. Recovery went just fine, arrr, but small areas o' t' mylar accentin' were burnt and curled. Ahoy! Begad!

Four (4) E15-7's be tried next. Avast! These motors came from Rocket Vision and had handy thrust rings. Well, blow me down! I applied an adapter and centerin' rings t' align the 24mm E15 into t' central mount. I lit all 4 simultaneously on t' ground, me bucko, ya bilge rat, and it flew VERY nicely. Blimey! Ya scallywag! Really, shiver me timbers, shiver me timbers, an 8 or 9 delay in t' center might have been even better. Well, blow me down!

T' first airstart was tried next, with a central Aerotech G40-10W and three (3) Estes D11-P's lit with three (3) 2-inch thermalite rapido wicks dipped in Igniterman primer and pyrogen (just t' be sure o' ignition) and held into the D11's with t' supplied igniter plugs. Well, blow me down! Arrr! T' rocket flew straight at first, arrr, but laterally slightly because it was windy outside. Begad! Ahoy! But all 3 outboards audibly lit right before t' G40 burned out. Arrr! It was neat. Ahoy! Recovery was just right.

Recovery:
T' rocket is prepped again t' show me friends at SSS me G40 and 3 outboard D11-P's again. Avast, me proud beauty! They like airstarts, me hearties, so I plan t' do it again. Aye aye! I haven't redone the finish, because t' wear on it gives character. Well, blow me down! T' chute isn't at all scorched and t' shock cord isn't damaged. Avast, me proud beauty! Blimey! No real cons. Begad! Blimey! T' rocket is nicely designed t' take some punishment. Avast, me proud beauty! Well, blow me down!

Flight Rating: 4 out o' 5

Summary:
Fun, easy, shiver me timbers, good for t' price. But I might add a small payload section t' allow the use o' timers t' light t' outboards when thermalite can't be gotten. Begad! Aye aye! I'd also recommend fiberglassin' t' side pods onto t' airframe because I managed to torque one off while removin' spent motors. Ahoy! It was easy t' re-epoxy, matey, but glassin' would be stronger. Aye aye! Ahoy! I'd also nay use metal shock cords unless they are short enough nay t' zipper t' body tube.

Overall Rating: 4 out o' 5

comment Post a Comment