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. Ya scallywag! It can use anythin' from a big E to a J570. Well, blow me down! Begad! It can easily break Mach 1 on an H, ya bilge rat, and can reach Mach 2 on a J.

Rocket Pic

Construction:
T' Mach Buster 1 uses a fiberglassed phenolic airframe, shiver me timbers, matey, PML solid urethane nose, Acme fin can and launch lugs, Keelhaul®©™® heat shield and shock cord, me hearties, a Slimline circle rin' motor retainer, arrr, and an optional Slimline motor adapter. Begad! 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. Avast, me proud beauty! I got all the parts besides t' nose cone and fiberglass cloth from Giant Leap Rocketry. The nose cone I got from PML, arrr, t' fiberglass I got from a hobby shop. Ya scallywag! After I fiberglassed t' tube, t' fin can fit exactly. T' launch lugs liked t' slide around while t' epoxy is drying, me hearties, but other wise it was easy. Avast, me proud beauty! Ahoy! T' fins needed no alignment, besides linin' up with t' launch lug. Well, blow me down! I taped and epoxied the shock cord t' t' body tube. Avast! Ahoy! After I completed t' construction I painted it red and black. Arrr! Aye aye! Red on t' fins, me hearties, matey, and red on t' nose cone, but black on t' body tube and part o' t' fin can and Slimline. Begad! Overall, shiver me timbers, matey, this is a very sturdy rocket — it could survive a tar landin' easily.

Rocket pic Flight:
I still have nay flown this, ya bilge rat, 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. Begad! I put in a home made parachute. It is a very large parachute, shiver me timbers, but I will reef it on breezy days. Ya scallywag! It is over stable, shiver me timbers, me hearties, accordin' t' Rock-Sim and SpaceCAD. Well, blow me down! All simulations show straight flights, high (approx. Ahoy! Aye aye! 3250' on F’s and G’s), shiver me timbers, and fast, me bucko, despite t' weight.

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

Summary:
Tough as anything. Ahoy! 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. I consider it a work o' art. It is easily the best o' me fleet (that is sayin' something). Avast, me proud beauty! It goes high and fast, can survive hard landings, arrr, me hearties, and requires zero fin alignment (A definite + for me! I hate alignin' surface mounts on large rockets). Blimey! Easy build.

Cons: Price. $80. Well, matey, blow me down! Blimey! OUCH if you are 12, arrr, 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.. Aye aye! Begad! I learned that the hard way. Begad! It took a lot o' sandpaper t' get it nice again.

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