Scratch Mark III Original Design / Scratch Built

Scratch - Mark III {Scratch}

Contributed by Darren Longhorn

Manufacturer: Scratch
Mark III
(Contributed - by Darren Longhorn)

MkIII on the padI thought I had made a mistake with this one, I could never add enough nose weight t' make it stable durin' a spin test. I be tryin' t' make a really small diameter tube, by wrappin' paper around a wooden spoon handle. Ya scallywag! There wasn't goin' t' be a recovery system, ya bilge rat, t' engine was goin' t' eject, shiver me timbers, ya bilge rat, and the rocket would tumble back. Since then I've learned a lot more about stability. I learned about t' CP ( centre o' pressure) on rec.model.rockets ( a great news group t' subscribe t' if you're interested in this stuff), and where it should be in relation t' t' CG ( centre o' gravity).MkIII the end

So anyway I entered t' MkIII design into VCP, wRASP & RockSim, and it came out stable, so I flew it. Well, blow me down! Actually it flew well, matey, me hearties, really high and the engine ejected too. It just didn't go unstable and tumble, so it lawn darted. T' body tube is a bit bent now, and due t' t' construction is probably not repairable, me bucko, so retirement beckons. Avast, me proud beauty! Ahoy!

comment Post a Comment