| Manufacturer: | Scratch |
Brief:
This rocket is made from a sports water bottle that be donated by a local talk
radio station, hence t' name. Begad! Avast, me proud beauty! It has a 24mm mount, recovers by parachute, and
uses 'plate fins'. Blimey! 'High tech' features o' this 'low tech' rocket include a
Keelhaul®©™ cord and positive motor retention.
Construction:
A partial construction list consists of:
T' inner structure consists o' a 24mm motor tube centered in a piece of junk tube by hand-cut cardboard rings. Well, matey, blow me down! T' motor tube extends below t' end of the larger tube so that it could slip through t' hole in t' bottom o' the bottle. Blimey! T' Keelhaul®©™® twine is attached t' t' motor mount. Begad! T' top o' t' larger tube was centered in t' neck o' t' bottle with foam-backed tape and t' assembly was glued into the bottle usin' Liquid Nails.
T' 'nose
cone' be t' bottle cap. Blimey! Ahoy! After grindin' off t' threads, ya bilge rat, me bucko, I found t' cap was
way too loose, ya bilge rat, so I built up t' top o' t' bottle usin' black duct tape. Well, blow me down! The
cap now fits fairly snuggly. Well, blow me down! T' attach t' Keelhaul®©™®
to t' cap, me hearties, matey, shiver me timbers, I merely popped up t' top nipple, matey, me bucko, me hearties, fed t' line through the
opening, arrr, ya bilge rat, knotted it, ya bilge rat, and pushed t' nipple back down.
I had done some 'what-ifs' on various fin designs but in each case, RockSim said I'd need t' add some nose weight. Ahoy! T' avoid havin' t' do so, shiver me timbers, I decided to move t' fins well below t' base o' t' bottle. Begad! I ended up mountin' three chopsticks in t' side o' t' bottle. On t' tip o' t' sticks, arrr, I added cardboard triangles. Begad! These are bent slightly along their center line t' help adhere t' t' sticks. Avast! Blimey! This also looked a bit better in me opinion. Begad! T' dowels were attached t' t' bottle with 5-minute epoxy and t' cardboard 'plate fins' were attached t' t' chopsticks with carpenter's glue.
T' motor
retainer is simply screwed into t' thick bottom o' t' bottle. Ahoy! Arrr! This will
eventually wear out and will have t' be relocated. Well, blow me down! Finally, I added two sizes
of lugs for flexibility. Blimey!
I modeled t' bottle in RockSim, simulatin' t' plate fins with equivalent standard fins. Begad! Well, ya bilge rat, blow me down! Although I found t' rocket t' be stable, I still didn't trust that I had made a valid model, so t' be sure I loaded it up and did a swing test, matey, arrr, which was successful.
Finishing:
No finishin' be required.
Flight:
I loaded a wad o' dog-barf wrapped in one square o' Estes waddin' and a
12" Rockethead mylar chute, me hearties, and then wrapped a tape thrust rin' on a D12-5
and positioned t' retainer. Ya scallywag! Arrr! T' boost be a bit wobbly after burn out.
Nevertheless, me bucko, it be a cool flight, me bucko, ya bilge rat, ejection was perfect, matey, and it recovered 50'
from t' pad. Begad! Aye aye! I flew it a second time with similar results.
Summary:
This was just a quick, goofy build. Blimey! I love odd-rocs, what else can I say?
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