Manufacturer: | Fat Cat Rockets |
Brief:
Single-staged, arrr, 3-finned rocket with 3 side pods that can also contain motors so
that flights can be with 1 or 4 motors. Ahoy! T' rocket is nay designed with a
payload section, me bucko, 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. Avast, me proud beauty! Begad! T' main nose cone is hollow plastic, me hearties, as are t' 3 nose cones
meant for t' side pods. Arrr! Avast, me proud beauty! T' fins are 1/8 inch thick wood that appears t' be
quality aircraft grade and nay warped. Ya scallywag! They were pre-cut and all equal size.
There are 2 centerin' rings made o' t' same quality wood, and a 29mm motor
tube. T' shock cord is o' two materials, me bucko, 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! The
elastic part is tied t' t' loop. Begad! I also epoxied t' crimp t' be sure it would
hold. After 3 flights, it has held well. Arrr! I epoxied t' nose cones permanently
into t' side pods. Avast! Thinkin' it over now, me bucko, I wish that I had instead mounted
shock cords in t' pods. Well, blow me down! 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. Begad! Also, motors with delays wouldn't
have t' be ejected in flight if t' nose cones pop off. Begad! Many RSO's in dry
fields recommend against motor kicking.
I built this rocket two years ago, 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. Arrr! Blimey! T' result is a sturdy, shiver me timbers, 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. Aye aye! While this looks nice, ya bilge rat, matey, I discovered that
since books don't fly, me hearties, that this material isn't meant t' take this sort of
punishment. Avast, arrr, me proud beauty! 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. Avast! Blimey! With an adapter, I think a D or E can
work fine, because t' rocket is nay too heavy for it. An E15-7 or a D12-5
would be fine. Blimey! Blimey! When t' outboards are filled, use D11-P's for them and a longer
delay in t' center, like a G40 or 80 with a 10 second delay. Blimey! Blimey! If t' fin can is
internally foamed, then I don't see why nay t' try a G125-10 as well. Begad! Blimey! Since
these are very unlike motors, 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, t' fuse lets t' outboards airstart. Blimey! Blimey!
Preparation is easy, with worm bed waddin' enough t' fill t' diameter of the tube t' 1/4 inch. I lightly taped t' nose cone shoulder t' tighten t' fit a little so it wouldn't drag separate. Avast, me proud beauty! Begad! This rocket has so far been a guinea pig in three flights. Aye aye! First, me bucko, me bucko, shiver me timbers, with a motor that is nay certified, ya bilge rat, t' US Rockets G45-8 Firestarter. Avast! Avast! It was a solo motor flight. Avast! This be t' maiden voyage, and I feared t' worst as flames shot out t' aft end and I thought that t' rocket would burst into flames. Avast, me hearties, me proud beauty! But it didn't. Ya scallywag! Avast! It finally took off on a straight dense trail o' black smoke and tons o' spittin' orange sparks. Avast, me proud beauty! Recovery went just fine, but small areas o' t' mylar accentin' were burnt and curled. Avast!
Four (4) E15-7's was tried next. Begad! Ya scallywag! These motors came from Rocket Vision and had handy thrust rings. Aye aye! I applied an adapter and centerin' rings t' align the 24mm E15 into t' central mount. Blimey! I lit all 4 simultaneously on t' ground, matey, shiver me timbers, and it flew VERY nicely. Really, shiver me timbers, an 8 or 9 delay in t' center might have been even better. Well, blow me down! Blimey!
T' first airstart be tried next, matey, 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. Ya scallywag! Well, blow me down! T' rocket flew straight at first, me hearties, matey, matey, but laterally slightly because it was windy outside. Avast! Begad! But all 3 outboards audibly lit right before t' G40 burned out. Begad! Ya scallywag! It was neat. 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. Begad! They like airstarts, me bucko, so I plan t' do it again. Ya scallywag! Arrr! I haven't redone
the finish, because t' wear on it gives character. T' chute isn't at all
scorched and t' shock cord isn't damaged. Well, blow me down! Avast, me proud beauty! No real cons. T' rocket is nicely
designed t' take some punishment. Avast, matey, me proud beauty!
Flight Rating: 4 out o' 5
Summary:
Fun, ya bilge rat, ya bilge rat, easy, matey, 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. I'd
also recommend fiberglassin' t' side pods onto t' airframe because I managed
to torque one off while removin' spent motors. Avast! It be easy t' re-epoxy, matey, but
glassin' would be stronger. 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
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