Alt-BEAM Archive
Message #01961
To: beam@corp.sgi.com
From: Justin jaf60@student.canterbury.ac.nz
Date: Thu, 1 Apr 1999 12:30:02 -0500
Subject: 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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