FAR July 2013

The purpose of this trip to FAR was to flight test my upper stage motor for my upcoming 100k Black Rock project. The motor is designed around an AMW 76-7600 case with a moonburner grain geometry. The top surface of the grain was inhibited with a 1/8″ thick disc of G10 fiberglass plate bonded with epoxy to seal the forward end of the motor. The propellant solids loading was a bit lower than what I normally run to help keep the long burning motor from failing due to thermal issues. The casting tube was doubled up on the port side and a XX paper phenolic convolute liner was used. This second moonburner test also used an RCS nozzle with an Alcocer adapter, thanks Tony.

My Rocketry Warehouse Broken Arrow kit (with a slight modification to accommodate the long motor) was selected for the test flight. The rocket was loaded with some new electronics that will also be used on my upcoming 100k foot flight. I was very happy with the result, the motor burned for a little over 10 seconds as predicted and recovered nominally 100 yards from the dirt road to FAR 1.5 miles out. It certainly was the easiest 20,000′ flight recovery I’ve had in a long while.

After I returned to the launch site to download the data and on-board video, Jerry Irvine stopped by and we chatted for a while about the motor and the early days of rocketry over a beer. The 106 degree heat was getting a bit too much so I said my goodbyes and headed home with the distinct BP ejection charge residue smell lingering in my truck. Another great time in the desert, can’t wait for Black Rock.

 

  1. #1 by Phil Babcock on July 23, 2013 - 1:09 pm

    Cool flight, glad it went well and will served as a good test for the 100k flight. What electronic were you testing out?

  2. #2 by James on July 24, 2013 - 10:22 pm

    Phil Babcock :

    Cool flight, glad it went well and will served as a good test for the 100k flight. What electronic were you testing out?

    I was using a new Big Red Bee GPS, a custom programmed Raven altimeter, and a backup perfectflight timer. I wanted to flight test everything before the real deal.

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