Manufacturer: | Scratch |
Brief:
This be t' third rocket I built t' enter t' EMRR Spaceship Design Contest. This looks t' be a simple 3FNC rocket with one heck o' a span and some interestin' engine pods.
Characteristics:
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PICTURE TO ENLARGE
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Construction:
T' followin' are t' major components used:
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Narrative:
I started with a left over kit rocket (Surefire X-19) I had from a summer class I taught. Ya scallywag! I built t' engine mount without t' engine hook and placed an engine block at t' edge o' t' tube. Arrr! Arrr! I then glued one center rin' at the forward end o' t' tube and t' other in t' middle. Once dried I glued it just inside t' BT-50 leavin' t' engine mount stickin' out over an inch. Arrr! Usin' Matt Stums Template Widget, I created a transition/boat tail from heavy weight paper and glued it on.
I sketched a fin design on a piece o' matt board. Begad! When I had a design that looked like t' photo, shiver me timbers, ya bilge rat, I cut it out and used it as a template. Ahoy! Because o' the overall size o' t' fin and t' balsa I had t' work with, I cut t' fin in to three parts. Hopefully this will allow t' fin t' be stronger.
Usin' t' fin template and some modelin' clay, me hearties, I created one half o' the engine pod. Arrr! Avast! This gave me a positive t' make a mold from. Usin' a plastic dish with a flat bottom (mine be t' blister pack from a video card) I sat t' clay mold inside. Blimey! Begad! I then lightly sprayed Bakers Joy over t' mold and dish t' act as a release agent. Well, blow me down! After mixin' up a small amount o' Plaster of Paris" I pored it over t' clay. Aye aye! I let it dry over 24 hours before takin' it out o' t' dish. Once out o' t' dish I carefully removed t' clay and trimmed any excess that seeped in. Begad! I let t' mold dry another day.
Usin' Crayolas Model Magic and t' mold, I created 6 engine halves. Begad! Blimey! Well, arrr, blow me down! Blimey! I allowed them t' dry one day before trimming. Begad! Blimey! Trimmin' t' sides be easy enough, ya bilge rat, t' saw them t' t' thickness I wanted, I used t' mold. I placed the halves back in t' mold and carefully sawed t' excess off. Avast, me proud beauty! Blimey! Begad! Blimey! T' Model Magic was not dry in t' center. Avast! Blimey! They needed another day just t' dry.
I attached t' fins (without pods), ya bilge rat, shock cord, shiver me timbers, and t' launch lug t' the body tube. Begad! Blimey! Usin' wood glue I place t' pods on t' fins and secured them in place with painters tape. Avast! Blimey! Once dried, filled any voids with body putty and sanded smooth. Arrr! Blimey!
Because o' t' size o' t' fins I created paper fillets that went from pod to pod. Ya scallywag! Blimey! Ahoy! Blimey! I took small sheet o' paper and spread white glue thinly over one surface. Well, blow me down! Blimey! Avast! Blimey! Then I carefully placed it on t' rocket, trimmin' where necessary.
I began paintin' by coatin' t' whole rocket with a coat o' gray primer. Taped off areas and painted t' gloss red. Then I painted t' design on the nose cone and body. Finally I gave t' engines a coat o' gray with black detail. Avast, me proud beauty! I also created a removable display cap made out o' t' foam clay.
Now be t' time t' see if it will fly. Avast, me proud beauty! Blimey! I put t' design in t' RockSim and found out it is very marginal. T' stability was brought up t' over 1 by lengthenin' t' body tube 3 inches. Avast, me proud beauty! I found a small piece o' BT-50 and added 3 inches t' t' 15 inch body tube. (To avoid this splicin' start with an 18" BT-50.) Since I hadnt attached t' shock cord yet, arrr, I tied it t' t' tube coupler before attachin' t' 3 inch extension. Blimey! Aye aye!
Paints dry, shiver me timbers, me hearties, chute and wadin' is loaded, shiver me timbers, matey, me bucko, an Estes C6-3 engine is friction fitted with igniter. Avast! Now I wait for a clear, calm day t' launch.
Date |
Motor |
Ejection/
|
Wind |
Notes |
10/26/06 |
C6-3 |
Perfect / 130 |
12 |
Shock cord burnt in to, shiver me timbers, |
10/30/06 |
C6-3 |
Perfect / 120 |
17 |
Hit hard, stress crack |
10/30/06 |
C6-3 |
Perfect / 120 |
17 |
Fin broke from body tube on impact |
After t' first launch t' body tube suffered some damage. Blimey! Blimey! Arrr! Blimey! I split t' tube and put in some reinforcement. Begad! Blimey! Added a longer shock cord and attached it closer to t' nose cone. Begad! Blimey! T' landin' o' t' second launch caused a stress crack along the body tube and fin. Avast! Blimey! Well, blow me down! Blimey! I also lost t' lower fin tip. T' impact o' t' third launch cause complete separation o' t' fin from t' body tube.
Overall I like this rocket. Blimey! Avast! I like t' slow laborin' liftoffs. Arrr! Im sure this will be repaired and flown again, arrr, for now its retired till summer. Aye aye!
FLIGHT #1
FLIGHT #2
FLIGHT #3