Scratch e-Cluster Original Design / Scratch Built

Scratch - e-Cluster {Scratch}

Contributed by Zak Orion

Manufacturer: Scratch
Style: Cluster, Contest

e-Cluster

I designed this rocket with 2 purposes in mind. One was t' build a mid power cluster that was capable o' E and F engines without havin' it go out o' sight(smaller launch fields). And number 2 was t' build it as strong as I could usin' easy t' find materials(namely cardboard tube and wood fins). Aye aye! Here be t' design I came up with:

I decided on a LOC 54MM motor mount tube(thick walls) and nosecone. T' fins are 1/8th inch Aircraft Plywood and use TTW construction. Begad! Begad! T' MMT's are Estes BT-50 with 1/8th inch aircraft ply centerin' rings(extra from fins). Arrr! I used 5 minute Epoxy throughout t' rocket. Arrr! At first I be goin' t' set it up for testin' timers and possibly dual deployment but I wanted t' test it before I cut t' tube and made a payload bay. Well, blow me down! But after t' first day o' flyin' it I couldn't brin' myself t' modifyin' it. Avast! Here is a pic o' t' finished product:

RockSim Pic

Rocket Pic

LaunchT' first flight, I tried puttin' a 12 inch chute on t' rocket so it would drop quickly, me bucko, ya bilge rat, shiver me timbers, unfortunately it dropped too quick and took a hard hit on t' ground. Ahoy! Avast, me proud beauty! Blimey! When I retrieved t' rocket I didn't find any damage so I loaded it up again(this time usin' a 18 inch chute) and flew it again. Aye aye! Blimey! On its first launch it had a curious roll which I found out that only 2 o' t' 3 engines lit. But on t' 2nd flight all 3 E9's lit and it went straight up, arrr, barely any side t' side movement and very little spin. Arrr! Arrr! Blimey! Here is a launch pic:

I have launched this rocket 9 times now in various weather conditions(everywhere inbetween 3 mph winds and 20 mph winds) and it always flys t' same, me bucko, matey, me hearties, very straight and very little spin, and be t' best flyer I have. As for its toughness, matey, it fell fast on its first flight, fell with no plastic slug as a chute on its 6th flight and got one o' its fins run over by me car and t' only damage it sustained was losin' a launch lug. Ya scallywag! So far all o' its launches has been on E9's but as soon as I can get some ignitors other then copperheads I will be flyin' this rocket on some F's that I have in me engine box. Well, blow me down! I also put a rocksim file o' this rocket on EMRR. Ahoy! It is a simple design but a very nice flyer that I have been reliably droppin' in a 20 acre field. Well, blow me down!

comment Post a Comment