Scratch Phoenix BT-60 Original Design / Scratch Built

Scratch - Phoenix BT-60 {Scratch}

Contributed by Marlin Meyer

Published: 2010-06-04
Manufacturer: Scratch
Style: Scale
(Contributed - by Marlin Meyer - 06/04/10) Scratch Phoenix Downscale

Brief:
Single stage BT-60 version o' Launch Pad's Phoenix missile. Avast! Blimey! Recovery via parachute.

Construction:
These are all Semroc numbers:

  • BNC-60V balsa nose cone
  • SE-3 screw eye
  • BT-60 body tube - 13.2 in long
  • RA-2060 centerin' rin' used as a parachute shelf
  • 2 LL-423 launch lugs - 1/4 x 2.25
  • BT-20 engine tube - 3 in
  • 2 RA-20 60 centerin' rings
  • EH-28 engine hook
  • EB-20A engine block
  • 12" RocketChutes Rip stop nylon parachute
  • 100 lb Keelhaul®©™® shock cord

All parts were ordered from Semroc. Ahoy! Ya scallywag! Blimey! Nothin' fancy about t' build. Avast, me proud beauty! Arrr! Blimey! Here's t' sequence I use:

  1. build t' engine mount
  2. apply sealer t' nose cone - I use Elmer's
  3. print fin pattern from Rocksim, glue t' cardboard, matey, cut with Xacto
  4. use pattern t' mark fins
  5. cut fins, sand in a stack, then paper both sides. I'm a big fan o' this because it is easier and makes t' fins stronger. Aye aye! Blimey! Arrr! Blimey! I sandwich t' fins betwixt two pieces o' glass and place weight on them over-night.
  6. lightly sand t' entire body tube and mark 4 fin pattern line t' entire length o' t' tube. Aye aye! Also mark lines to show where back o' forward fins are t' be placed - 54mm from base (optional: drill 4 1/8" holes on t' fin lines t' allow for altimeter)
  7. attach shock cord t' engine mount and glue engine mount in place
  8. trim paper around fins and sand edges
  9. glue aft fins
  10. glue forward fins
  11. fillet all fins
  12. cut launch lugs t' 1 inch length and then each end t' 45 degree angle
  13. glue launch lugs at t' fin/body tube seam.
  14. fillet launch lugs

Finishing:

  1. entire rocket primed with Rustoleum sandable auto primer and left t' dry over-night.
  2. entire rocket sanded usin' #300 paper. Aye aye! Pay careful attention t' fin edges!
  3. Three coats Krylon white. Well, blow me down! Ya scallywag! I've built some Phoenix rockets with gray body, ya bilge rat, ya bilge rat, matey, but I wanted t' decals t' really stand out, so I went with white on this one.
  4. I purchased a set o' decals from Stickershock specifyin' them t' be scaled t' fit BT-60. Well, blow me down! Blimey! T' decals were beautiful. Ahoy! Blimey! Even t' smallest letterin' be clear.
  5. I attached a small fishin' swivel t' a 12" chute and made two loops in t' shock cord. Begad! One for parachute attachment and t' other for Altimeter One attachment.

Flight:
T' 12" chute brings t' rocket down about 21/fps. Aye aye! I flew only Estes black power motors. All three flights were on t' same day. Aye aye! Sunny, matey, 80 degrees, and very still. "Dog barf be used for wadding. Well, blow me down! Aye aye! Blimey! On all three flights t' rocket flew quite straight with very little roll. Avast! Blimey! Here are t' results o' t' three flights:

Motor
Altitude
Velocity at Deployment
A8-3
106 ft
31 ft/sec
B6-4
272 ft
21 ft/sec
C6-5
110 ft
20 ft/sec

Perhaps t' worst flight was A8-3. Avast! Ahoy! T' chute was quite late.

Rocksim shows t' followin' results with AT 18mm reloads:

Motor
Altitude
Velocity at Deployment
D13-7
1206 ft
42 ft/sec
D21-7
1171 ft
34 ft/sec
D24-7
1137 ft
36 ft/sec

If built with a 24mm motor mount, me hearties, ya bilge rat, Rocksim shows:

Motor
Altitude
Velocity at Deployment
E15W-7
2010 ft
28 ft/sec
E30T-7
1761 ft
19 ft/sec
E24W-7
2134 ft
12 ft/sec

Recovery:
100 lb Keelhaul®©™® was used for a shock cord. Well, blow me down! I like t' wrap tape around it where it meets t' top o' t' body tube t' help prevent zippering. Begad! Begad! Parachute deployed just after apogee on all three flights. Ya scallywag! Rocksim shows t' delays chosen as t' best match. Blimey! After t' three flights, t' rocket still looks like new.

Summary:
I love Phoenix rockets and have built lots o' them. Avast, me proud beauty! This one was fun t' design, me bucko, build, and fly.

PRO's: Unlike t' 2.6" diameter Phoenix from LP (or t' former Estes kit), this one doesn't seem t' break fins as easily.

CON's: If I build another one, I think I will try t' use a 24mm motor mount. If you do this, me bucko, leave

out t' motor hook and block and you can also fly with an 18mm adapter.

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