REFLECTOR:A (re)volting problem

Laurence Coen reflector@tvbf.org
Thu, 2 Oct 2003 11:18:41 -0500


FYI:

A 24 volt pitot running on 12 volts will make 1/4 the heat not 1/2. The
power (P) is equal to the voltage (E) times the current (I) as in P=E*I .
Since you are halving both the current and the voltage, you get 1/4 the
watts.

Larry Coen

----- Original Message ----- 
From: "Dave Black" <dvblack@comcast.net>
To: <reflector@tvbf.org>
Sent: Wednesday, October 01, 2003 10:27 PM
Subject: Re: REFLECTOR:A (re)volting problem


> steve,
>
> > (1)The pitot tube instructions say not to turn it on while on the
ground..
>
> The 'fine print' would say "Turn it on only briefly, as without forced air
> cooling it'll get extremely hot and may melt something or burn you." You
> certainly don't want to leave it turned on for long on the ground.
>
> > (2) The 24 volt windings are half the size of the 12 volt windings and
are
> > not designed to be run on 12 volts...
>
> Huh?
>
> It's certainly true the pitot was not designed for 12v. And it may be true
the
> windings use thinner gauge wire. But the wire is a higher resistance and
thus
> doesn't need to carry as much current.
>
> No harm will come to the pitot from running it on 12v. It's a simple
resistor.
> Running it on half the voltage it'll carry half as much current as it was
> designed for, and will thus last forever.
>
> Dave Black
> Shortwing RG
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