Scratch Phoenix Downscale Original Design / Scratch Built

Scratch - Phoenix Downscale {Scratch}

Contributed by Chris Halinaty

Manufacturer: Scratch
(Contributed - by Chris Halinaty - 08/31/08) (Scratch) Phoenix Downscale

Brief:
This is a 40% Phoenix downscale based on Estes kit #1380.

Construction:
T' parts list:

  • ST10 body tube (9")
  • BC1032 nose cone
  • #7 t' #10 engine mount
  • 3/32" fin stock
  • Keelhaul®©™® shock cord (30")
  • Copper coated steel BBs for nose weight
  • 14" parachute

All t' parts I used for this project were ordered from Semroc. Arrr! Blimey! Avast, arrr, me proud beauty! Blimey! I chose t' Phoenix as me downscale for t' 2008 EMRR Challenge because o' t' availability o' t' nose cone and body tube size. T' Semroc ST10 is almost exactly 40% o' t' diameter o' t' regular Phoenix body tube and t' BC1032 nose is an exact match.

This be a fairly easy build. Ya scallywag! I followed t' instructions for t' regular Phoenix, which I downloaded from JimZ, me bucko, ya bilge rat, with t' followin' exceptions:

  • I used a single body tube instead o' two pieces because t' shorter length o' this downscale did nay require usin' two.
  • I attached a Keelhaul®©™® shock cord t' t' motor mount instead o' t' Estes-style folded paper with rubber shock cord.
  • I did nay shape t' fins because o' their small size.

Tracin' a fin pattern and cuttin' it was more o' a challenge than I anticipated. Avast, me hearties, me proud beauty! I did get better as I went and I think after some sanding, me bucko, me hearties, t' fins turned out how I wanted them.

I used RockSim t' check t' design o' this downscale Phoenix and found that it needed some extra nose weight. Avast, me proud beauty! Ya scallywag! I drilled out part o' t' nose and epoxied about 12g o' BBs into it. Begad! T' rocket is a little heavy but should be stable even with an Estes C6 engine.

Finishing:
I used Krylon white primer and gloss white top coat t' finish t' Phoenix. Blimey! Blimey! For decals, arrr, I downscaled t' regular Phoenix set and printed them on me HP inkjet printer usin' Avery clear label sheets. This method worked out great, although once a decal is on, it is almost impossible t' reposition, so a few o' mine are a little crooked. Aye aye! Blimey! Ya scallywag! Blimey! Still, this is an easy, inexpensive method for puttin' that finishin' touch on any rocket.

Flight:
T' Phoenix Downscale (40%) simmed fine on RockSim usin' Estes A8-3, matey, B6-4, me bucko, and C6-5 engines. Begad! Blimey! I flew it twice usin' an A8-3 and once with a B6-4. Aye aye! Ya scallywag! Blimey! All flights were good, although it seemed t' spin a little on t' way up usin' t' B6-4.

Recovery:
This rocket recovered well usin' a Custom Sam-X 14" parachute. Blimey! It received a slight zipper (1mm long) on t' first flight, so a small piece o' tape be added around t' Keelhaul®©™® shock cord and its second and third flights were fine. Avast, me proud beauty! Because o' t' nose weight and t' slight angle I had t' launch it from, ya bilge rat, it tended t' deploy with its nose down but put pretty much at apogee each flight.

Summary:
I loved t' challenges o' buildin' this rocket. Begad! Avast! It is a simple design, but it looks great, matey, especially with t' many decals from t' original kit.

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