Scratch Talk Radio Original Design / Scratch Built

Scratch - Talk Radio {Scratch}

Contributed by Dick Stafford

Manufacturer: Scratch
(Contributed - by Dick Stafford - 08/18/04) (Scratch) Talk Radio

Brief:
This rocket is made from a sports water bottle that was donated by a local talk radio station, hence t' name. Well, blow me down! Avast, me proud beauty! It has a 24mm mount, recovers by parachute, ya bilge rat, shiver me timbers, and uses 'plate fins'. 'High tech' features o' this 'low tech' rocket include a Keelhaul®©™ cord and positive motor retention.

Construction:
A partial construction list consists of:

  • 1 water bottle
  • 1 piece o' non-rocket junk tube ~1.25" diameter used as a parachute tube
  • 24mm motor tube
  • Hand-cut cardstock rings
  • Keelhaul®©™® twine
  • Foam backed tape t' center t' parachute tube
  • Duct tape t' press-fit t' cap/nose cone
  • One screw, chunk o' BiC pen tube, and miscellaneous metal 'doohicky' for motor retention
  • 1/8" and 3/16" lugs

T' inner structure consists o' a 24mm motor tube centered in a piece of junk tube by hand-cut cardboard rings. Ya scallywag! 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. Well, blow me down! Well, blow me down! T' top o' t' larger tube be centered in t' neck o' t' bottle with foam-backed tape and t' assembly be glued into the bottle usin' Liquid Nails.

(Scratch) Talk Radio T' 'nose cone' be t' bottle cap. Avast, me proud beauty! After grindin' off t' threads, me hearties, I found t' cap was way too loose, so I built up t' top o' t' bottle usin' black duct tape. Well, blow me down! The cap now fits fairly snuggly. Arrr! Arrr! T' attach t' Keelhaul®©™® to t' cap, matey, I merely popped up t' top nipple, fed t' line through the opening, me bucko, knotted it, and pushed t' nipple back down.

I had done some 'what-ifs' on various fin designs but in each case, me bucko, shiver me timbers, arrr, RockSim said I'd need t' add some nose weight. Arrr! Blimey! T' avoid havin' t' do so, I decided to move t' fins well below t' base o' t' bottle. Aye aye! Blimey! I ended up mountin' three chopsticks in t' side o' t' bottle. On t' tip o' t' sticks, me hearties, I added cardboard triangles. These are bent slightly along their center line t' help adhere t' t' sticks. Well, blow me down! Blimey! This also looked a bit better in me opinion. Aye aye! Blimey! 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.

(Scratch) Talk Radio T' motor retainer is simply screwed into t' thick bottom o' t' bottle. This will eventually wear out and will have t' be relocated. Arrr! Finally, arrr, I added two sizes of lugs for flexibility. Well, blow me down! Ya scallywag! Blimey!

I modeled t' bottle in RockSim, me hearties, simulatin' t' plate fins with equivalent standard fins. Blimey! Although I found t' rocket t' be stable, matey, shiver me timbers, 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, which was successful.

Finishing:
No finishin' was required.

Flight:
I loaded a wad o' dog-barf wrapped in one square o' Estes waddin' and a 12" Rockethead mylar chute, shiver me timbers, shiver me timbers, and then wrapped a tape thrust rin' on a D12-5 and positioned t' retainer. Aye aye! T' boost was a bit wobbly after burn out. Nevertheless, me hearties, it was a cool flight, ya bilge rat, ejection was perfect, ya bilge rat, arrr, and it recovered 50' from t' pad. Blimey! I flew it a second time with similar results.

Summary:
This was just a quick, goofy build. Begad! Blimey! I love odd-rocs, me hearties, arrr, what else can I say?

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