Scratch Starchaser Original Design / Scratch Built

Scratch - Starchaser {Scratch}

Contributed by Glenn Roth

Published: 2010-04-16
Manufacturer: Scratch
(Contributed - by Glenn Roth - 04/16/10)

Brief:
Scaled down "scratch" built version of original estes model, which was a representation of the Starchaser Industries entry in the Ansari X-PRIZE competition, the Thunderstar. I opted to go with 13mm 2-engine cluster.

Construction:
Rocket consisted of a BT-55 body tube for main airframe, dual 13mm motor mount consisting of two heavy duty centering rings, two 3" long motor tubes, two engine block rings, plastic nose cone, heavy duty balsa fins, paper launch lug, 15" heavy duty elastic shock cord + a 24" dacron shock cord, and a 12" parachute, 2 sodastraws. (may change that to a 15")

I had sent for the original estes plans to use as a guide. My big difference was using 13mm motors, thicker fins, and a smaller chute, that I may increase in size. I had read some of the other reviews and opted for heavier fins, coated in several layers of modge podge. Gave it a nice smooth finish and now ready for paint. Used a "guide" to mark out fin and launch lug location.

Opted for "round elastic" and 20lb dacron shock cord, for a total length of 3'. (Don't want any dents in body tube). Also, thick balsa fins coated in "modge podge" for strength.

Finishing:
I finished it in metalic silver paint, and cut up some Initiator stickers. Came out looking a lot sharper than expected.

Flight:
Flt 1 3/6/10: Only 1 engine lit and deployed safely just before landing

Flt #2: 3/6: Perfect flight! Both motors lit, and went about 300'. Perfect chute deployment and soft landing. Very happy with this flight!

Recovery:
Shock cord "heavy duty round elastic and 20lb dacron cord for a total of 3' of shock cord, attached w/standard mount. Assembly was easy. A little tricky to get both motors to ignite but, with my launcher or "clip whip", makes an impressive flight.

Summary:
Pros: "heavy duty round elastic and 20lb dacron cord for a total of 3' of shock cord. Epoxied fins on w/"loctite". easy to use, strong, and easy cleanup w/water.

Cons: "Friction fit" motor attachment instead of "engine hooks."

Finishing: Came out nice. Used several coats of poly over paint a decals.

comment Post a Comment