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. Begad! Blimey! Ahoy! Blimey! T' body is made from foam rubber and t' fins from foam poster board. Ya scallywag! Blimey! Aye aye! Blimey! I wanted t' build somethin' out o' a noodle for a long time, me bucko, me bucko, and this contest finally inspired me to do so. Begad! Blimey! Ya scallywag! Blimey! Although this review may nay qualify for t' contest, me bucko, I just couldn't resist submittin' it anyway. Ahoy! Blimey! Avast! 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! Ahoy! 12" section o' a 2" diameter, matey, pink pool 'noodle'
  • 2. Small chunk from a purple noodle t' plug t' forward hole and provide color contrast
  • 3. Avast! Foam poster board
  • 4. BT-20 motor tube
  • 5. Ya scallywag! Avast, me proud beauty! Spent 18mm engines for a motor plug and forward ballast
  • 6. Begad! Clay for ballast
  • 7. Aye aye! 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. Well, blow me down! Aye aye! With t' drill clamped in a vise, I shaped the end near t' drill while stabilizin' t' far end by hand. Blimey! Arrr! 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, shiver me timbers, and included a ½" tab. Well, blow me down! Begad! T' body be slotted t' accept these tabs. Aye aye! Avast! An engine consists of a section o' BT-20 and t' nozzle end o' a spent casing. I cleaned the nozzle and plugged it with just a dab o' epoxy clay. Blimey! Hey, me bucko, shiver me timbers, arrr, sometime you gotta use what you have on hand. Begad! Avast! T' nose weight was made from a spent engine filled with clay. Ya scallywag! I used epoxy t' glue in t' engine tube, me hearties, t' nose weight, fins, and the rail buttons. T' foam plug in t' end o' t' nose is pressure fit. Begad! Aye aye!

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

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

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

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

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

Summary
This was an easy rocket t' make and it flies great. Boink recovery is pretty cool. Well, blow me down!

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