Scratch Mark VI Original Design / Scratch Built

Scratch - Mark VI {Scratch}

Contributed by Darren Longhorn

Manufacturer: Scratch
Mark VI
(Contributed - by Darren Longhorn)

PoserT' success o' the MkV made me start t' think a bout t' bigger tubes I had stacked in t' corner. If I could cluster four engines, shiver me timbers, why nay six? Why nay use D engines? I had a tube that would hold seven 24mm mounts, me bucko, shiver me timbers, but it wasn't really long enough. Arrr! So I decided t' built a rocket reminiscent o' t' MkIV, me bucko, with a transition, arrr, and forward fins. With t' extra weight o' t' engines, matey, t' plywood fins and centerin' rings, matey, this design turned out nay t' be stable ( Usin' RockSim). Begad! I increased t' length o' t' upper tube ( forward o' t' transition) and removed the forward fins. Aye aye! Begad! Blimey! That be a lot better.

Engines installedI had heard o' some larger black powder engines available in t' UK form a company called Rocket Services and wanted t' option o' installin' them. Aye aye! So I went for a removable cartridge system. Blimey! Well, blow me down! T' Fins were mounted through t' body wall and formed runners onto which t' engine cartridge would slide. Avast, me proud beauty! Arrr! T' cartridge was made up from two discs o' plywood drilled with holes for t' engine mounts. Avast, me proud beauty! T' cartridge slid in t' t' body on t' runners and was then locked into position by rotatin' the whole thing. Blimey! Well, ya bilge rat, blow me down! In t' end I just went with six engines. Ahoy! Ya scallywag! Thrust rings were made from sawn up spent D engines and epoxied in t' place. Avast, me proud beauty! A stuffer tube was placed inside t' main body, shiver me timbers, mounted on two centerin' rings. Begad! At ignition t' upper body was t' separate, shiver me timbers, each half with its own parachute. Ahoy! Karen made a red and white hemispherical 'chute for t' lower half, me bucko, and I was goin' t' use t' pink circular 'chute for t' upper half. Ahoy! We intended t' fly it at t' International Rocket Weekend, and I had a lot o' help from Brain who made and painted the transition just days before we went.

PreppedAt t' event, a lot o' doubt be raised about t' engine cartridge system. Well, blow me down! 'Six D ejection charges will blow it out' they said. Aye aye! I also couldn't determine how I was goin' t' ensure that both parachutes deployed. In t' end I bought some big shock cord and tied both halves together on t' red & white 'chute. Another hitch, I had planned to add another set o' clips t' me ignition system, me hearties, but had forgotten ( that last week was hectic as I me work had taken me away from home for several days), and I didn't have a large enough launch pad... Begad! Begad!

Lift offLuckily I learned o' a new technique for clustering. Blimey! Well, arrr, blow me down! This involves usin' a single igniter t' ignite 'quick match' fuses that are fed into t' individual engines. Aye aye! One o' t' organizers, John Bonsor, me hearties, showed me how t' do this. Blimey! Avast! I managed t' borrow a launcher and after a wait for t' wind t' die down, ya bilge rat, we were ready. Ya scallywag! T' ignition and initial flight were perfect, except, what was that? A small object appeared t' fly from the back at ejection, and where was t' 'chute. Arrr! Arrr! T' rocket came in ballistically. What had happened was exactly what t' 'doom sayers' were predicting. Arrr! Arrr! Even though I had staggered t' ejection by usin' a mixture o' D12 delays, matey, the ejection gases pushed t' engine cartridge out o' t' rear, instead of deployin' t' chute. Ya scallywag! Ahoy! T' rocket was a write off. Ya scallywag! Begad! T' engine cartridge shattered, t' forward tube like a concertina, matey, arrr, me hearties, and t' aft tube a slowly unwindin' spiral.

T' pic o' lift off be t' last shout from me last roll o' film, so mercifully thar are no pictures o' t' rocket as we found it. Ahoy! T' realization of t' hours we had all spent on this rocket, which be now trash, didn't sink in until later, me bucko, and it be a long drive home from Largs t' Leeds.

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