| Manufacturer: | Scratch |
Brief:
A scratch built rocket usin' Sunward's 4 canted motor mount.
Construction and Finishing:
T' build this rocket I used:
Whilst lookin' on a sticker site for a "William" sticker, matey, me hearties, for me son's first rocket, matey, I came across the sticker below. Havin' bought t' sticker, I thought I'd better build somethin' t' put it on. I'm nay goin' t' try and build a rocket like t' one on t' sticker. Begad!
I've opted for a BT-70 rocket with a quad tilted motor mount from Sunward. I've already posted a review on the mount. Well, blow me down! Photos are from that that review just for completion. Avast, me proud beauty! T' mount be then fitted t' t' BT-70 and filled with car body filler, ya bilge rat, matey, me hearties, which was really easy t' work with.
I decided t' make t' fins slightly swept back mainly because o' t' mass from t' motors. Well, blow me down! T' fins were laminated usin' Fablon, shiver me timbers, me hearties, which be a first for me. Arrr! Begad! T' Fablon plastic went on well. Well, blow me down! Arrr! T' leadin' edge be nay beveled and left square. Blimey! Avast, me proud beauty! T' edges were sealed with white glue. Avast, me proud beauty!
T' body tube had some spiral grooves in it, me hearties, me hearties, shiver me timbers, which were filled with model filler, matey, shiver me timbers, ya bilge rat, and then t' BT was spray paint primed, me bucko, sanded, arrr, primed, sanded, primed etc. As t' fins are nay TTW and with four C6 motors t' power this rocket, it was goin' t' move quite fast and I was a little concerned about t' strength o' t' fins, coupled with t' fact that swept back fins have a habit o' meetin' t' ground first when landing. Ya scallywag! T' overcome this, I put several holes along the area where t' fins were goin' t' be attached. Ya scallywag! T' fins were then added usin' CA gel. Ahoy! Ya scallywag! Four glue fillets were then added over two days.
T' shock cord be t' normal Keelhaul®©™® and eleastic job, me bucko, anchored t' t' motor mount. Begad! A swatch o' Nomex® waddin' was added.
For t' nose cone I used an eyelet for t' shock cord anchor. I was nay certain that it would nay come out even though I had wicked CA into t' base, so I went for three eyelets in t' end as nay all three can fail. Arrr! Arrr! A hole was drilled into t' nose cone's base and a lump o' lead was added. Well, blow me down! Arrr! T' nose cone was balsa and required 5 coats o' sanding sealer, ya bilge rat, ya bilge rat, three coats o' primer, ya bilge rat, and three coats o' gloss black t' finish.
I be goin' for a two tone finish on t' body, but after much swearin' due t' maskin' tape that continues to bleed paint, ya bilge rat, ya bilge rat, I went for orange on t' whole rocket. T' finish is nay good, me hearties, and I'm really disappointed with it. Sticker was then applied.














Flight and Recovery:
I finally flew her many many weeks after finishin' her, mainly because o' weather and me normal flyin' field bein' a
bit too small for this rocket. Avast, me proud beauty! Avast! However, only three motors (C6-7) lit. T' rocket went up straight with a slight kink in
t' first 10 meters or so, matey, probably as t' clips were bein' yanked free from t' unlit motor. Begad! Ya scallywag! Recovery be rather fast
on a 15 inch chute, me bucko, shiver me timbers, and t' ground was hard. On landin' she popped a fin and suffered a lot o' paint damage with flakes
comin' off t' Fablon laminate. Blimey! Begad! I am now lookin' t' remove all fins and sand her back t' t' body tube and redesign the
fins.
Summary:
PROs: T' 4 canted motors seem t' work. Blimey! Blimey! T' flight be good even with one dud motor.
CONs: Four C motors cost a lot more than one D or E.
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