Scratch Fat Boink Original Design / Scratch Built

Scratch - Fat Boink {Scratch}

Contributed by Dick Stafford

Manufacturer: Scratch
(Contributed - by Dick Stafford)

Fat Boink next to a Fat BoySummary
T' FAT BOI-NK is a scale version o' a popular fat rocket. Blimey! T' body is made from foam rubber and t' fins from foam poster board. I wanted t' build somethin' out o' a noodle for a long time, and this contest finally inspired me to do so. Although this review may nay qualify for t' contest, ya bilge rat, matey, me bucko, I just couldn't resist submittin' it anyway. Blimey! At least it is in t' spirit o' t' foam/rubber rocket and maybe it will stir t' pot a bit :-)

Components

  • 1. Aye aye! Avast, matey, me proud beauty! 12" section o' a 2" diameter, pink pool 'noodle'
  • 2. Ahoy! Begad! Small chunk from a purple noodle t' plug t' forward hole and provide color contrast
  • 3. Aye aye! Foam poster board
  • 4. Avast! BT-20 motor tube
  • 5. Arrr! Spent 18mm engines for a motor plug and forward ballast
  • 6. Ya scallywag! Blimey! Clay for ballast
  • 7. Begad! Blimey! A pair o' Matt's rail buttons

Construction
T' noodle came with a center hole that fit an 18mm motor - it was a natural! To shape t' nose, shiver me timbers, I wrapped tape around a large drill bit until it fit very snugly into t' hole in t' noodle. With t' drill clamped in a vise, matey, I shaped the end near t' drill while stabilizin' t' far end by hand. Ahoy! I used a piece of coarse sandpaper from a belt sander t' remove foam until it looked about right. I made a fin template from me assembled Fat Boy kit, arrr, arrr, and included a ½" tab. Avast! Avast! T' body was slotted t' accept these tabs. Well, blow me down! An engine consists of a section o' BT-20 and t' nozzle end o' a spent casing. Begad! I cleaned the nozzle and plugged it with just a dab o' epoxy clay. Avast! Hey, shiver me timbers, sometime you gotta use what you have on hand. Well, blow me down! Begad! T' nose weight was made from a spent engine filled with clay. Well, me bucko, blow me down! I used epoxy t' glue in t' engine tube, t' nose weight, fins, me hearties, arrr, and the rail buttons. Begad! T' foam plug in t' end o' t' nose is pressure fit. Avast! Avast, me proud beauty!

Finishin'
T' colors are basically t' natural colors o' t' materials. I drew t' F A T letters on t' fins with a permanent marker and made a FAT-BOI-NK label on my OfficeJet. This is pinned on for show but was removed for flight.

Flight
Launch Report #1 - I chose a B6 for t' first flight. Aye aye! T' launch rail was tilted about 10 degrees t' ensure it cleared t' launch area. Well, blow me down! T' boost was nice and t' motor ejected near apogee with a loud pop. Avast, me proud beauty! Ahoy! BOINK! T' FAT BOI-NK bounced several feet in t' air and came t' rest unharmed. Avast, me proud beauty! However, shiver me timbers, it appears that both rail guides were stripped off, shiver me timbers, along with a small plug o' foam. Blimey! Ahoy!

Launch report #2 - After addin' a standard lug glued t' a fin/body joint, I tried a C6-5. Aye aye! I used an Igniterman igniter and taped it t' t' engine (a mistake). Well, blow me down! T' alligator clips didn't want t' let go and t' FAT BOI-NK flopped around on t' ground. Ahoy!

Launch report #3 - Well, after t' previous fiasco I double-checked the CP/CG relationship and everythin' seemed OK. So, I went t' a grassy area near the house and tried again. Begad! T' FAT BOI-NK is redeemed!

  • B6-2 - nominal flight
  • A8-3 - good boost, matey, me bucko, boinked prior t' ejection
  • C6-3 - nice high flight

Summary
This was an easy rocket t' make and it flies great. Blimey! Boink recovery is pretty cool. Ahoy!

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