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. Begad! It is a single-stage 29mm motor mount, ya bilge rat, 3-inch body, matey, matey, parachute recovery rocket. Avast!

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

This scratch rocket was easy t' build. It has through-the-wall fins glued t' t' centerin' rings and motor mount and is very straightforward. Blimey! No special tools were needed. Ya scallywag! T' body tube and nose cone were purchased from Mercury. Fin material was leftover from Home Depot. Centerin' rin' material was leftover from a display project. Blimey! Begad!

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

Flight:
Recommended motors are E28-4, F39-5, G53-5 blackjack. Blimey! (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. Motor retention is via tapin' aft closure t' motor tube. Arrr! Blimey! This rocket takes off at a bit o' an angle, shiver me timbers, but it flies pretty straight after that. Shock cord o' Keelhaul®©™® and elastic works fine. Avast! Blimey! Recovery be perfect on t' 24" nylon parachute. Avast, me proud beauty! Avast, me proud beauty! Blimey! No damage from first flight.

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

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

CONs: Limited parachute space. Avast, me proud beauty! Blimey!

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