Alt-BEAM Archive
Message #01930
To: beam@corp.sgi.com
From: Justin jaf60@student.canterbury.ac.nz
Date: Thu, 01 Apr 1999 14:35:29 +1200
Subject: [alt-beam] Re: COX Planes
> I have a cox plane in my basement that has a battery pack, and you charge
> the plane for 20 seconds with the battery pack, turn it on and let it go. I
> has 2 caps in it, and I was wondering if anybody knows the size of those
> caps, because they must be big for that plane to run about 20+ seconds.
I'd suggest connecting your largest cap of known capacitance to it and
compare the running time (use a multimetre to check that you're charging
it to the same voltage if poss).
I've got the same problem with Hotwheels X-V racers. They charge from 3
AA's for 10 seconds and run for over a minute on an incredibly
inefficient motor.
Anyway - what are these cox planes? Where would I get some and how much
would they cost? In other words, are they a useful source of big caps?
The complete hotwheels cars cost about Euro$9, and as far as my
guesswork goes, the cap is 5V and seems to be at least 2F, yet it's only
13x23mm, so they're well worth it.
From the performance, I suspect they're 2F, yet from the size and price,
I keep thinking they've got to be 1F, it's difficult to tell as my next
largest cap is only .033F, but charge and discharge times from the
hotwheels cap seem to be far more than the expected 6 times greater.
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