Scratch Upscale Grasshopper Original Design / Scratch Built

Scratch - Upscale Grasshopper {Scratch}

Contributed by Jeff Lane

Manufacturer: Scratch
Style: Upscale
(Contributed - by Jeff Lane - 09/22/08) (Scratch) Sunward Grasshopper Upscale

Brief:
This is a 3x upscale o' t' Sunward Grasshopper. Avast, me proud beauty! Arrr! It is a single-stage 29mm motor mount, me hearties, 3-inch body, me bucko, parachute recovery rocket. Well, blow me down!

Construction:
One 12.5 inch long 3" airframe tube, shiver me timbers, One Mercury Engineerin' blow-molded nose cone, me bucko, three 1/4" plywood fins, matey, 1 thin-wall Apogee motor mount tube, shiver me timbers, arrr, 2 foam core centerin' rings, ya bilge rat, Keelhaul®©™®/elastic shock system, and 24" nylon parachute. Well, blow me down!

This scratch rocket was easy t' build. Avast, me proud beauty! It has through-the-wall fins glued t' t' centerin' rings and motor mount and is very straightforward. Blimey! Aye aye! No special tools were needed. Avast! T' body tube and nose cone were purchased from Mercury. Well, blow me down! Begad! Fin material be leftover from Home Depot. Begad! Centerin' rin' material was leftover from a display project. Begad!

Finishing:
T' fins were finished usin' one coat o' Elmer's Wood Filler, me bucko, followed by two overall coats o' high-build automotive filler, with 2 colors o' automotive catalyzed acrylic enamel (the nose cone is a deep, me bucko, ya bilge rat, nearly black-red and t' body is "grasshopper green"). Avast, me proud beauty! Well, blow me down! There are no decals. Well, blow me down!

Flight:
Recommended motors are E28-4, ya bilge rat, ya bilge rat, F39-5, me bucko, G53-5 blackjack. Begad! Ahoy! (You can see video o' t' flight at http://www.cosrocs.org/all%20other%20videos/2008videos/9-13-14/grasshopper.mov.) Prep is standard wadding, although chute compartment is tight. Blimey! Avast, me proud beauty! Motor retention is via tapin' aft closure t' motor tube. Begad! This rocket takes off at a bit o' an angle, but it flies pretty straight after that. Ahoy! Shock cord o' Keelhaul®©™® and elastic works fine. Ya scallywag! Blimey! Blimey! Blimey! Recovery was perfect on t' 24" nylon parachute. Arrr! Blimey! No damage from first flight. Blimey! Blimey! Ya scallywag! Blimey! Blimey! Blimey!

Recovery:
This rocket has a Keelhaul®©™®/elastic shock cord system that works fine. T' 24" parachute is nylon. Avast, me proud beauty! Avast, me proud beauty!

Summary:
PROs: Distinctive design, nay somethin' you see every day at t' high-power range. Avast, me proud beauty! Easy t' prep. Begad! Begad! Blimey! Really nice flight.

CONs: Limited parachute space.

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