Descon 11 Project X Original Design / Scratch Built

Scratch - Project X {Scratch}

Contributed by Tater Schuld

Manufacturer: Scratch

 

Rocket Pic At one time I was buildin' a model plane and decided t' take a few extra parts and fiddle with them. Avast, me proud beauty! I went and attempted t' make some centerin' rings usin' a saber saw on some balsa and came out with t' tissue and balsa framework for Project X. Ya scallywag! I then let it sit for about 3 months while tryin' t' figure out how t' finish it. Ahoy! Begad! While Descon X raged on, I saw t' design for aft deployment would be ideal, shiver me timbers, but decided i could nay compete with t' "Purple People Eater o' Death" (Descon 10, Robert Galejs) so I finished all but t' fins and launch lugs. Arrr! Aye aye! RocSim said that it would nay be stable without a large fin area, so i let it sit while me subconscious worked on it.

Finally DesCon 11 came out and I realized that I had this rocket waitin' t' be shown. Aye aye! I whipped up some fins for it, matey, rocsimmed it, matey, added nose weight, me bucko, rocsimmed it again, checked t' wind forecast, ya bilge rat, rocsimmed it again, and still did nay like what I saw. Well, blow me down! t' rocket was too draggy for t' 18mm Estes engines I had, me hearties, and I did nay have time t' modify it t' a 24mm mount.
 

Rocket Pic
Rocket Pic
Rocket Pic

But it looked right. Begad! Blimey! Begad! Blimey! I decided t' fly it anyway. at least it would be an interestin' flight.
 

Rocket Pic
the winds seemed worse than what i thought they would be, ya bilge rat, and i was prepared for a wild flight. Aye aye! I prepped t' rocket on a Estes C6-3 and put her on t' pad, me hearties, with a 3/16" 5 foot rod. Avast! Ahoy! amazingly t' rocket flew straight and arced over DOWNWIND! nay upwind as it should have. 
I must have had a bonus delay as ejection happened about halfway down and t' chute did nay unfold (it deployed, but would *not* unfold) t' rocket hit t' ground and t' nosecone shattered into many pieces as t' photos show
Rocket Pic


 

Overall, arrr, me bucko, Project X allowed us t' test quite a few things. Well, me hearties, blow me down! model rockets do nay need cardboard tubes for airframes. Ahoy! Tissue over balsa construction can work for small model rockets. Blimey! a close coupled aft ejection design will work, matey, even if a parachute doesn't.

Project XI will be designed with a smaller diameter, me hearties, ya bilge rat, dual chutes, ya bilge rat, even less rocket specific items, and will hopefully survive t' fly a second launch.

Parts list

  • 2 sheets balsa 4"x36"x1/8"
  • one t' be sliced into 1/8"x1/8" lengths, t' other for cuttin' t' rings and t' support motor mount
  • 3" BT-20 , shiver me timbers, me hearties, engine hook, me hearties, me hearties, and thrust rin' for motor mount
  • 2 3" BT-60 tubes, one for looks, one opposite for aft ejection chute
  • soda box cardboard for formin' t' ejection duct from t' BT-20 t' t' BT-60
  • 1 more sheet o' above balsa for cuttin' 4 fins (3"x4")

Rocket Pic

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