Static test 5B of EX-motor F-eX

This is a video showing one of the (many) static tests my KNSU-motor went through *before* I flew it for the first time. The first flight has been posted here on youtube before.

This video was recorded with the camera mounted on a tripod about one meter away from the motor. The motor is electrically ignited with me on a safe distance should things go wrong.

As you notice this test was recorded as test 5B, and it was the second test using a delay grain that (at the time) hopefully would give approx. 6 seconds of delay after burn out. It worked out. I now use the exact same formula for all my delay grains.

If you watch the vid closely you can see that the motor first thrusts forward (it was not held down as tightly as I had aimed for). As the ejection charge goes off it then moves backwards. What happened was that the masking tape holding the charge in place got pushed forward, acting as a piston against the wooden stand.

A little about the hardware:
I turned everything on my lathe, including nozzle and delay grain holder. Nothing was bought except the raw materials. Build time, including design, was about 10 hours. Then I do not count the hours I spent on the net collecting valid data from reliable sources but only the time it took turning everything and have it anodized. Casing and delay holder is aluminum, nozzle stainless steel.

I aim not to be dull but I won't post anything about the fuel mixture/s here on youtube. There are serious EX-forums on the web, and if interested you should join one or more.

The tree got seriously harmed from the long screws I used for holding down the motor. It does not matter though as the tree is destined to become firewood in the near future.

Category:

Science & Technology

Tags:

• KNSU
• rc
• candy
• rocketry
• EX
• experimental
• f-class
• rocket
• static
• test
• successfull
• nozzle
• sugar
• motor

[balltip]

Hello! I use commercially bought black powder for ejection charges.

[trekridr42]

what did you make the ejection charge with?