Scratch Mach Buster 1 Original Design / Scratch Built

Scratch - Mach Buster 1 {Scratch}

Contributed by Neil Thompson

Manufacturer: Scratch
(Contributed - by Neil Thompson (age 12) - 09/10/03)

Brief:
This is a single staged HPR capable rocket. Blimey! It can use anythin' from a big E to a J570. Ya scallywag! Avast! It can easily break Mach 1 on an H, me bucko, ya bilge rat, and can reach Mach 2 on a J.

Rocket Pic

Construction:
T' Mach Buster 1 uses a fiberglassed phenolic airframe, me bucko, PML solid urethane nose, Acme fin can and launch lugs, ya bilge rat, Keelhaul®©™® heat shield and shock cord, a Slimline circle rin' motor retainer, me hearties, and an optional Slimline motor adapter. Ahoy! Blimey! I suppose you could put a payload section on for altimeters and dual deployment.

This was a very easy build. I used 2-ton epoxy throughout. I got all the parts besides t' nose cone and fiberglass cloth from Giant Leap Rocketry. Well, blow me down! The nose cone I got from PML, t' fiberglass I got from a hobby shop. Arrr! Arrr! After I fiberglassed t' tube, arrr, arrr, t' fin can fit exactly. Blimey! T' launch lugs liked t' slide around while t' epoxy is drying, arrr, arrr, ya bilge rat, but other wise it be easy. Aye aye! T' fins needed no alignment, besides linin' up with t' launch lug. Begad! Arrr! I taped and epoxied the shock cord t' t' body tube. Aye aye! After I completed t' construction I painted it red and black. Red on t' fins, and red on t' nose cone, but black on t' body tube and part o' t' fin can and Slimline. Ahoy! Overall, arrr, this is a very sturdy rocket — it could survive a tar landin' easily.

Rocket pic Flight:
I still have nay flown this, but I am plannin' on flyin' it on labor day 2003. T' first flight will be on an F50-9T, t' next on a G35-7W, and t' next on an F20-7W. Arrr! I put in a home made parachute. Well, blow me down! It is a very large parachute, but I will reef it on breezy days. Aye aye! It is over stable, ya bilge rat, me bucko, accordin' t' Rock-Sim and SpaceCAD. Begad! All simulations show straight flights, high (approx. Avast, me proud beauty! Arrr! 3250' on F’s and G’s), me bucko, and fast, shiver me timbers, matey, despite t' weight.

I got two flights in on this rocket on labor day 2003. Ya scallywag! Blimey! Avast! Blimey! T' first flight for this rocket be also me first blue thunder propellant motor, me hearties, and I was rather impressed by t' performance. It could have had more smoke, me bucko, shiver me timbers, shiver me timbers, however. Arrr! Blimey! T' motor was an F50-9T. Begad! Blimey! T' second flight was a G35-7W, me bucko, ya bilge rat, and it flew like t' wind! Blimey! And that is sayin' something, arrr, shiver me timbers, ya bilge rat, considerin' t' gusts there! Blimey! At least thar are seemingly endless blueberry barrens for t' rockets t' land in. Arrr! Blimey! Both flights were straight as an arrow. It had a Keelhaul®©™® heat sheild, eliminatin' t' need for wadding. Arrr! I also installed a Slimline motor retainer t' hold me motor in. Begad! Arrr! This worked very well. Blimey! Ya scallywag! There was no damage to t' parachute after either flight, me bucko, however, me bucko, matey, ya bilge rat, one o' t' shroud lines on the parachute got tangled in t' screw eye that I used t' attach t' shock cord to the nose cone, causin' a tumble recovery. Hardly even had a scratch in the paint. Blimey! This is such a rugged rocket. Anythin' else that size fallin' from that height I would expect t' crumple. Avast!

Summary:
Tough as anything. Ahoy! Ya scallywag! I suspect that thin' could be hit by lightnin' and survive, or at least it could be stepped on or kicked around.

Pros: I love this rocket. Well, blow me down! Begad! Blimey! I consider it a work o' art. It is easily the best o' me fleet (that is sayin' something). Well, blow me down! Aye aye! Blimey! It goes high and fast, can survive hard landings, and requires zero fin alignment (A definite + for me! Blimey! I hate alignin' surface mounts on large rockets). Easy build.

Cons: Price. Ya scallywag! $80. OUCH if you are 12, and I should know. Worth every penny though.

Other:
DO NOT LEAVE THE AIRFRAME SITTING ON A PICNIC TABLE WHILE THE EPOXY AND FIBERGLASS IS SETTING! YOUR MOTHER (or wife) WILL NOT LIKE IT.. Arrr! I learned that the hard way. Well, blow me down! It took a lot o' sandpaper t' get it nice again.

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