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. Well, blow me down! 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, me hearties, me bucko, with Rocsim running. Aye aye! Well, me bucko, blow me down! We selected body tube and fin style. T' velocity is relatively low, so we did nay need TTW construction. Avast! We started by assemblin' an Estes engine mount, rocsimmin' fins and printin' out t' template. Avast, me proud beauty! Ya scallywag! 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, with a short length o' elastic for give. Aye aye! T' parachute is attached t' t' stock plastic Estes nose cone with a ball-bearin' fishin' swivel. Begad! Avast! Voila - no tangled shroud lines!

For t' graphics, we got photos o' her favorite singer, me hearties, Hillary Duff, shiver me timbers, from an online source. We printed these onto plain paper with t' printer after appropriately sizin' them for t' fins. Ya scallywag! We got t' name from one o' Ms. Aye aye! duff's songs. Avast, me proud beauty! Aye aye! 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. Well, blow me down! Blimey! We used CA t' attach t' graphics, me bucko, and then clear-coated over t' rocket in several light coats. Begad! Blimey! It really shines.

We now call these "girl rockets".

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

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

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

Summary:
Pros: GREAT way t' get girls into rocketry. Ahoy! Hot pink looks unusual, matey, matey, but is VERY practical for findin' rockets.

Cons: Nay for those insecure in their masculinity. Aye aye! Blimey! It be t' antithesis of "macho". T' graphics would be better on decals.

comment Post a Comment