Scratch Express Mail Original Design / Scratch Built

Scratch - Express Mail {Scratch}

Contributed by Drake "Doc" Damerau

Manufacturer: Scratch
(Contributed - by Drake Damerau - 03/30/05) (Scratch) Express Mail

Brief:
Mid power rocket made with free Priority mail boxes, arrr, parachute recovery.

Construction:
To build this rocket, you will need two triangle priority mail tubes, shiver me timbers, me hearties, shiver me timbers, packing tape, wood glue, and a hobby knife.

T' first step is t' make t' body. Arrr! Well, blow me down! Cut t' end flaps off o' one o' the tubes (picture below-left). Begad! Avast, me proud beauty!

Peel t' self stick tape off o' t' side flap and seal t' box. Blimey! Set this aside for now (picture below-right). Well, blow me down!

T' next step is t' make t' nose cone. Cut about 9 inches off t' end of one o' t' boxes. Begad! Ahoy! Use t' end that has t' flaps. Blimey! Now cut t' self stick flap from t' side. Begad! Arrr! This be t' trickiest part o' t' build. You will need t' trim the sides and "work" t' fold in t' middle t' make it fit into the other box. T' fit has t' be good t' ensure that t' pressure doesn't leak out and fails t' blow off t' nose cone. Ya scallywag! Ahoy! When you get a good fit, me hearties, use packin' tape to close t' end and side. Begad!

Flaps Tape

(Scratch) Express MailNow you can make t' motor mount. Begad! I used an 11" x 17" sheet o' paper wrapped around a couple o' E engines and secured it with some packin' tape. Begad! Soak the paper liberally with CA t' stiffen it up. Avast, me proud beauty! I did this t' keep it a free paper rocket, but you can use a MMT if you wish. Well, blow me down!

Now make two centerin' "rings" (centerin' triangles really) out of the leftover tube. You can use your motor tube t' draw circles t' cut the holes. You will need t' cut a hole for t' tube now in t' box you made for the body tube. Arrr! Glue t' motor tube assembly in t' rocket as you would with any other rocket.

(Scratch) Express Mail Cut three fins out o' t' remainin' box. Arrr! I chose t' glue them t' t' sides but you can arrange them any way you wish. Launch lugs were made from a discarded Aerotech igniter tube. Recovery can be installed usin' any system you wish.

T' finished weight without recovery was 15.6 oz.

Finishing:
I chose nay t' finish mine. Begad! Avast! If you wish t' finish yours, I would recommend two coats o' primer t' seal t' cardboard before painting. Blimey! Ahoy! Another idea would be to just seal it with a clear coat t' prevent t' cardboard from soakin' up moisture.

Flight:
T' first flight was on an E16-4W. It looked like it went t' about 500 feet. T' delay be good but t' flight was underpowered. This is an F powered rocket.

Recovery:
I used a 24" paper parachute for this flight. Ahoy! T' recovery be good, me hearties, but it landed in a stream. Avast! By t' time I got t' it, it was soaked beyond repair. Avast, me proud beauty! Ahoy!

Summary:
This be a fun rocket t' build. Blimey! Ahoy! T' price was right and its nice t' do somethin' unusual.

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