Scratch Why Not? Original Design / Scratch Built

Scratch - Why Not? {Scratch}

Contributed by John Chapman

Manufacturer: Scratch
(by John Chapman - 08/24/05) Why Not

Brief:
This is an 18mm engine altitude rocket with "Hillary Duff" graphics, built with me daughter t' interest her in rocketry.

Construction:
T' BT50 based design has elliptical fins for efficiency, shiver me timbers, givin' good altitude for schoolyard launches on smaller engines. Begad! Its light construction gives good parachute duration. Finally, t' hot pink color and Hillary Duff graphics delighted me daughter.

I started by sittin' down with me daughter in front o' t' PC, with Rocsim running. We selected body tube and fin style. Avast! Ahoy! T' velocity is relatively low, so we did nay need TTW construction. Well, blow me down! Begad! We started by assemblin' an Estes engine mount, shiver me timbers, ya bilge rat, rocsimmin' fins and printin' out t' template. We then cut out t' fins, sandin' on t' airfoil after gang-sandin' them t' identical dimensions on a belt sander.

We used 100 lb Keelhaul®©™® thread fastened t' t' engine mount for parachute retention, shiver me timbers, shiver me timbers, with a short length o' elastic for give. T' parachute is attached t' t' stock plastic Estes nose cone with a ball-bearin' fishin' swivel. Voila - no tangled shroud lines!

For t' graphics, ya bilge rat, we got photos o' her favorite singer, Hillary Duff, me bucko, shiver me timbers, from an online source. Avast, me proud beauty! We printed these onto plain paper with t' printer after appropriately sizin' them for t' fins. Begad! We got t' name from one o' Ms. Begad! duff's songs. Avast, me proud beauty! We used t' same "plain-paper printing" technique t' create the logo and name on t' side.

We used Wal-Mart fluorescent Krylon paint t' get t' hot pink color. Avast, me proud beauty! Avast, me hearties, me proud beauty! We used CA t' attach t' graphics, and then clear-coated over t' rocket in several light coats. It really shines.

We now call these "girl rockets".

Flight:
We have flown this twice, once on a B 6-4, shiver me timbers, me bucko, and once on an A 8-3. Aye aye! Both produce ejection that is just about optimal. t' rocket is nay overstable, so it doesn't weathercock. Avast! T' small engines allow one t' appreciate just how far tis coasts after t' engine ceases boosting. Avast, me proud beauty! t' stock 12" parachute takes this a long way in a breeze, but drops t' rocket softly almost onto our heads in calm conditions.

We use crepe paper for wadding, me bucko, with a fold around t' rolled parachute for protection. Begad! this works perfectly. Aye aye! Ya scallywag! No singein' o' chute. T' rocket looks new after two flights, thanks t' a combination o' correct engines, ya bilge rat, good chute and little wind.

T' hot pink color makes t' rocket VERY easy t' see against t' sky. Begad! Blimey! I believe I'll build several more "girl rockets", for just this reason.

Summary:
Pros: GREAT way t' get girls into rocketry. Well, blow me down! Hot pink looks unusual, shiver me timbers, but is VERY practical for findin' rockets.

Cons: Nay for those insecure in their masculinity. Avast, me proud beauty! It be t' antithesis of "macho". T' graphics would be better on decals.

comment Post a Comment