Descon Easter Egg Rocket Original Design / Scratch Built

Scratch - Easter Egg Rocket {Scratch}

Contributed by Dan Major

Published: 2012-11-04
Manufacturer: Scratch

I get a big kick out o' t' challenge o' makin' rockets from "found objects". Avast! I tend t' walk through stores in a kind o' a daze sometimes, wonderin' what sort o' adapter or how much thrust it will take t' "fly" certain objects on t' store shelves. Avast, me proud beauty! Aye aye! This is one o' me recent attempts. Blimey! Begad! Everythin' is found or made from scratch except t' engine mount tube, arrr, me hearties, centerin' ring, matey, matey, shiver me timbers, and thrust rin' in t' "nose cone" (launch lug was hand-rolled).



This be t' completed rocket next t' an 18mm engine casing


A shot with t' nose cone off...


Showin' t' streamer...


And with t' streamer folded and packed into place.

T' egg gives interestin' and fun flights from 200-300 feet. Arrr! Aye aye! Blimey! T' streamer recovery can brin' t' rocket down a bit fast, esp. Aye aye! Blimey! if it lands on concrete, so t' construction needs t' be robust (either that or you need t' take a big bottle o' CA glue t' t' range). Ahoy! Short delays work best as this thin' has enough drag that it stops goin' up when t' engine gives out.

Engines I've flown it on: first flight be on an A8-3. Just wanted t' make sure it would fly. Aye aye! Then followed with B6- and C6-3 engines. T' B engines really scoot off t' pad, but I think t' egg goes higher on a C. Avast, me proud beauty! Begad! Be sure t' tape t' engine because this is a serious dart if t' engine is spit out rather than t' streamer.

Parts List: Plastic Easter Egg (mine is about 3" long by about 1 3/4 dia.), arrr, engine mount tube and thrust ring, matey, paper centerin' ring, matey, external couplin' tube, 1/8" plexiglass (fins), launch lug, matey, and streamer. Avast! T' engine mount, me hearties, arrr, shiver me timbers, centerin' ring, me bucko, and green external coupler tube came from an Estes parts kit (engine mount kit?). Begad! Aye aye! Fins are 1 1/2" wide at t' root, me hearties, shiver me timbers, ya bilge rat, and have a span o' 2" long. Ya scallywag! Ya scallywag! I just guessed at t' curve aroung t' egg and sanded until they fit. They are swept at about 30 degrees.

Construction note: t' front half o' t' nose cone, forward o' t' thrust rin' is filled with epoxy (you can see t' rin' left in t' first picture where t' epoxy heated and slightly melted t' nosecone as it cured. This be done for several reasons. Avast, me proud beauty! First t' mount t' green couplin' ring. Aye aye! Since t' area forward o' t' engine be so small, I thought that somethin' was needed here t' prevent t' rocket from splittin' rather than seperatin' at t' seam. Begad! Second, it adds strength in case it lands on t' tip o' t' nose. Ahoy! And third, me bucko, t' add weight t' move t' CG forward. Avast, me proud beauty! T' lips where t' two halves snap together need t' be sanded down so they pop apart easily.

 

any questions or comments? mail to: major@tensor.nssl.noaa.gov

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