Brief:
Single stage, low power, parachute recovery rocket. I saw the review posted on EMRR of this rocket, used the provided Rocksim file (thank you) and upscaled to BT-55

Construction:
Parts are all Semroc:

• BNC-55PT nose cone
• SE-2 screw eye
• BT-55 body tube
• 15" parachute (Topflight)
• BT-20 engine tube
• (2) RA-2055 centering rings
• EB-20A engine block
• EH-28 engine hook
• (2) LL-110 launch lug

With the exception of the parachute which I already had, I purchased all the parts from Semroc. In reading the difficulty of getting the two-tone paint job with the fins so close together, I experimented and decided to put a little more space between them. I was able to run a clean wrap of tape to apply the second color and I liked the way it looks. It did change the CG, but didn't present a problem. All fins were papered using white glue and then surface mounted using TiteBond II. As with any multiple fin rocket, care was taken to get them aligned. I put the lower fins on first, then used two strips of plywood to align the upper fins. The 18mm motor mount is a little underpowered, but I wanted to design this one for smaller fields. If you want altitude, you might want to try this with a 24mm motor mount.

Finishing:
I used rattle cans to get the flat white/fluorescent orange paint job. After the usual priming and sanding, I sprayed the entire rocket flat white, waited a couple of days and then masked off the areas to remain white and hit it with one coat of orange. The Frog Tape yielded some very clean lines. The paint job was pretty simple and the rocket remains without any decals. It looks ok and should be easy to track and locate.

Flight:
I only had two flights. Both were on the same day with light winds. I used "dog barf" for wadding and made certain I had enough to prevent the chute from slipping down and destroying the CG

Here are the results:

B6-4 approx. 450 ft. timing on the chute was just about perfect. (just after apogee)

C6-6 approx. 800 ft. chute was a little late

Both flights were pretty straight up. Even with the late chute on the C6, I had no zippering or damage.

Recovery:
The shock cord is 150 lb Kevlar® attached at the motor mount and about 3 times longer than the rocket.

Summary:
I thank the previous reviewer of this rocket for the Rocksim file and the paint scheme.

PROS: It is a great flier for smaller fields. Simple build. Hi-Vis paint job

CONS: A bit under-powered. At this size it needs a 24mm motor mount if you want altitude.