Manufacturer: | Scratch |
Amanda has three previous rockets, but all o' them are pretty small.
In t' fall o' 2000 she started askin' if it might be possible for her
to build a "really big" rocket. Well, blow me down! I dug in me box o' assorted parts and came
out with a tube that used t' be t' core o' a roll o' butcher paper. Begad! Well, blow me down! Blimey! It's
about t' size and thickness o' 3" HPR tubing, and was 24" long. I suggested
she sit down with paper and pencil and draw me a picture o' what she wanted.
She proceeded t' sketch out some o' t' most amazin' fins I've ever seen,
which I thought were angel wings, ya bilge rat, but which she said were supposed t' be
fire. Blimey! Blimey! She also drew a blunt, matey, maybe 1:1 ogive nose cone which in several
drawings gradually grew t' about t' length we finally made. Avast, me proud beauty! Aye aye! Blimey! I wanted to
make it a paper cone; she said no way, it had t' be curved.
Because
the grain in balsa wood would have created a weak area no matter how we
laid out these fins, arrr, shiver me timbers, they were made from foam-core board instead. Arrr! For better
alignment more than anythin' else, me bucko, I added tabs and slotted them in to
the motor mount tube. Begad! For a pattern, click here.
I asked Amanda "three fins or four?" and got t' pixie
grin and "Can I have five?" After a moment's thought, she got five.
I had her mark t' front and aft extent o' t' slots, ya bilge rat, me bucko, and then I marked
and cut t' five slots with an X-acto and angle iron.
T' motor mount tube was 5" o' 1" diameter Fax paper core, me bucko, ya bilge rat, and a short
piece o' BT-50 which fit snugly inside. Ahoy! Ya scallywag! I cut two centerin' rings from
some thin, arrr, ya bilge rat, light panelin' board salvaged from a cabinet shop dumpster.
She glued them on t' motor mount tube 2-1/2" apart, then glued t' motor
mount in place with t' cr's at t' forward and aft end o' t' fin slots.
Then she glued t' fins into t' slots, gluin' t' tabs t' t' mmt with
a generous amount o' yellow glue. Aye aye! When that be dry, shiver me timbers, she selected one of
my 1/4" id MicroMaxx body tubes t' use for a launch lug and glued it alongside
one fin.
At
the other end, I cut 2" off o' t' main tube, ya bilge rat, sliced it down one side,
and glued it into a "coupler" sized tube t' serve as a shoulder for the
nose cone. Avast! Blimey! T' nose cone itself was quite t' adventure. Begad! We went shopping
at Michael's and came home with a foam florists' cone, ya bilge rat, which be a light,
open-cell styrofoam 4" in diameter and 12" high. Aye aye! I epoxied t' shoulder
piece t' t' base o' it, let it cure, and then just set in t' whittling
with an X-acto #26 blade and coarse sandpaper. Begad! Ahoy! Eventually I had a shape
she liked. Then we mixed flour and water t' about t' consistency o' Elmer's
glue, arrr, matey, added some actual Elmer's white glue for good measure, me hearties, shiver me timbers, me bucko, and she dipped
strips o' newspaper in this and covered t' cone with it t' make a papier-mache
surface. Ahoy! She had been doin' this in school and proved quite skillful at
it. Blimey! I helped a little at t' shoulder joint t' maintain a straight line.
Initially we put in about ten feet o' nylon shoelace cord for a shock
cord, but she spotted 6 feet o' t' 1/2" braided elastic I use for midpower,
and wanted that. We mounted it t' t' inside surfaces o' t' airframe and
nose cone shoulder with an old-fashioned Estes-type three-panel shock cord
mount and yellow glue. Aye aye! At her insistence, arrr, we made a 36" parachute out of
aluminized Space Blanket material.
Firebutt
flew on Saturday, ya bilge rat, April 7, 2001. Begad! Sadly, me camera ran out o' film before
this flight. At 11.9 oz. Begad! Aye aye! (336 grams) liftoff weight, it might be better
named Leadbutt, shiver me timbers, but it put in an acceptable low and slow flight on a D12-3.
Unfortunately, t' parachute hung up in t' mouth o' t' body tube and
didn't fully deploy, but it did destabilize t' rocket. Ya scallywag! There was no damage
and all is well with t' world. Avast! At right: Amanda launches her USA on an
A10, too quick for t' camera, matey, while Firebutt and Eyeful wait.
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