This is a 40% Phoenix downscale based on Estes kit #1380.
The parts list:
All the parts I used for this project were ordered from Semroc. I chose the Phoenix as my downscale for the 2008 EMRR Challenge because of the availability of the nose cone and body tube size. The Semroc ST10 is almost exactly 40% of the diameter of the regular Phoenix body tube and the BC1032 nose is an exact match.
This was a fairly easy build. I followed the instructions for the regular Phoenix, which I downloaded from JimZ, with the following exceptions:
Tracing a fin pattern and cutting it was more of a challenge than I anticipated. I did get better as I went and I think after some sanding, the fins turned out how I wanted them.
I used RockSim to check the design of this downscale Phoenix and found that it needed some extra nose weight. I drilled out part of the nose and epoxied about 12g of BBs into it. The rocket is a little heavy but should be stable even with an Estes C6 engine.
I used Krylon white primer and gloss white top coat to finish the Phoenix. For decals, I downscaled the regular Phoenix set and printed them on my HP inkjet printer using Avery clear label sheets. This method worked out great, although once a decal is on, it is almost impossible to reposition, so a few of mine are a little crooked. Still, this is an easy, inexpensive method for putting that finishing touch on any rocket.
The Phoenix Downscale (40%) simmed fine on RockSim using Estes A8-3, B6-4, and C6-5 engines. I flew it twice using an A8-3 and once with a B6-4. All flights were good, although it seemed to spin a little on the way up using the B6-4.
This rocket recovered well using a Custom Sam-X 14" parachute. It received a slight zipper (1mm long) on the first flight, so a small piece of tape was added around the Kevlar® shock cord and its second and third flights were fine. Because of the nose weight and the slight angle I had to launch it from, it tended to deploy with its nose down but put pretty much at apogee each flight.
I loved the challenges of building this rocket. It is a simple design, but it looks great, especially with the many decals from the original kit.