HPR Nuke Pro Maxx

[MasonH]

Ok, so my friend and I have ordered a Nuke Pro Maxx, a stiffy tube coupler, an Aeropac Retainer, and a 2.14 bulkhead. Our goal is to make a DD capable NMP rocket that can reach supersonic speeds and over a mile high on nothing larger than an I motor. The parts were ordered from apogee today and should be here Saturday or Monday, so all I have left to buy are rail buttons, nomex, and a shock cord. The first two I can get locally, but the chord I will order from Top Flite. Chances are that if this build goes well, I will buy the same kit and do the same project for myself instead of with a group, just because I love the kit so much.

[EeebeeE]

Follow my threads on the same rocket. According to Open Rocket, my DD Nuke Pro Maxx will achieve Mach 1.2 with a CTI I470. I offset my body tube segment on my Av Bay by a half inch, then extended the motor tube 5/8" from the end of the rocket, and the result is that I can fly this thing on a CTI 6XL case. A J530 will put this thing up to 10,000 feet at a peak of Mach 1.7.

Providing of course that I do not shred. Attached is my Open Rocket design.

[MasonH]

Rocksim says close to 10200' on the same motor, and Mach 1.92 on a J825(?). Either way, I will not be pounding this with a J for years since I am only 15, almost 16. I hope to get this thing to fly by the end of summer. Do you have a link to the build thread?

[grouch]

Mine had a set back yesterday. I wasn't in the right state of mind when I tried to make a sled for my altimeter. It didn't come out as good as I wanted so it is back to the drawing board. I still think I am only a couple of weeks until it will be done though. As long as mine in done before the next CATO for a rundown flight I should be ready to spank it at NERRF. The rocket is seriously cool for sure.

[CarVac]

@MasonH: Rocksim is fairly useless for supersonic predictions. OR and RASAero are better for that.

[MasonH]

I have two main concerns with this build. The first is how to give the fins enough structure to prevent themfrom snapping off. They will be mounted with JB weld and use thickened external fillets, but how do I get internal fillets? I have heard of using expanding foam with a high density, and have used the injection technique that Wildman uses. What are other ways to get structure in the small gap between the motor mount and the airframe?

Secondly, how do I get the motor mount installed the best? My guess was to thicken some epoxy and spread it around the inside of the tube, then slide the motor mount in. Will this work, or will i need to do something different? Again, expanding foam was something I was suggested to use, but I have never used it and it just seems like a hastle.