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. Well, blow me down! Arrr! 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, me hearties, ya bilge rat, and this contest finally inspired me to do so. Begad! Avast! Although this review may nay qualify for t' contest, me hearties, I just couldn't resist submittin' it anyway. Ahoy! Aye aye! At least it is in t' spirit o' t' foam/rubber rocket and maybe it will stir t' pot a bit :-)

Components

  • 1. Avast! 12" section o' a 2" diameter, shiver me timbers, ya bilge rat, pink pool 'noodle'
  • 2. Ahoy! Small chunk from a purple noodle t' plug t' forward hole and provide color contrast
  • 3. Blimey! Ya scallywag! Foam poster board
  • 4. BT-20 motor tube
  • 5. Aye aye! Spent 18mm engines for a motor plug and forward ballast
  • 6. Arrr! Clay for ballast
  • 7. Avast! 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, I wrapped tape around a large drill bit until it fit very snugly into t' hole in t' noodle. Begad! With t' drill clamped in a vise, ya bilge rat, I shaped the end near t' drill while stabilizin' t' far end by hand. Avast, me proud beauty! 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. T' body was slotted t' accept these tabs. Begad! 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. Ahoy! Hey, sometime you gotta use what you have on hand. Arrr! Avast, matey, me proud beauty! T' nose weight be made from a spent engine filled with clay. Blimey! Well, me hearties, blow me down! I used epoxy t' glue in t' engine tube, arrr, matey, shiver me timbers, t' nose weight, shiver me timbers, me bucko, fins, me bucko, and the rail buttons. Avast, me proud beauty! T' foam plug in t' end o' t' nose is pressure fit. Ya scallywag!

Finishin'
T' colors are basically t' natural colors o' t' materials. Aye aye! 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 be removed for flight.

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

Launch report #2 - After addin' a standard lug glued t' a fin/body joint, ya bilge rat, 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. Blimey! So, me bucko, I went t' a grassy area near the house and tried again. Aye aye! T' FAT BOI-NK is redeemed!

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

Summary
This be an easy rocket t' make and it flies great. Boink recovery is pretty cool.

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