 63J Coilgun Completed!
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OwlFowl
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Registered Member #1441
Joined: Sun Apr 13 2008, 03:40PM
Location:
Posts: 10
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Thanks for all your comments and input!
Barry:
Excellent performance figures, too!
Not anymore! I simply used a box as my sound detection and placed my cg 1m away. For these two trials I used 1 new and 1 used battery. Here are my results.
It seems like the measurements are more precise when I moved the sound target 1m away instead of the mere 10cm. From that, I've gotten:
the speed of sound is already factored in the t values, and
the mass of the projectile is 0.005kg
joules stored in capacitors is 63J NOT 112J
trial 1: t=0.04495233
v=22m/s
e=1.9%
trial 2: t=0.04712933
v=21m/s
e=1.8%
My goal in this project was to obtain a velocity more than 20m/s or an efficiency of 2%+
I would say it was pretty successful considering I've only used 1 new battery in the experiment. Time to get new C batteries 
OZZY:
How are you setting the start position?
I used a bolt and nail to hold the projectile in place, and I measured the velocity of the projectile for each mm the nail is protruding from the bolt. I found that with 11mm-12mm of the nail sticking out from the bolt I can fire with maximum velocity. Considering the length of the nail it would mean that the projectile is just resting outside of the coil.
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