REFLECTOR:A (re)volting problem

KeithHallsten reflector@tvbf.org
Wed, 1 Oct 2003 18:19:49 -0700


Chuck,
Before fixing your problem, determine whether you actually have one!  Clip
or safety-wire a thermocouple to the pitot and go fly on a cold day.  If the
heater can keep the pitot at 100 degrees Fahrenheit, you don't have a
problem.  If it can't, a little insulation on the lower part (or reduce the
extension out the nose) may do the trick with no electrical change.
Keith

----- Original Message ----- 
From: "Chuck Jensen" <cjensen@dts9000.com>
To: <reflector@tvbf.org>
Sent: Wednesday, October 01, 2003 5:52 PM
Subject: RE: REFLECTOR:A (re)volting problem


> I think I'll try the 12v routine. Right now the breaker is marked "inop"
but
> I guess I'll test it out...on the ground.
>
> John Tvedt said there is a DC to DC converter but says it'll only puts out
> about something like 0.630A, which I assume, like he does, wouldn't get
the
> job done.
>
> Now, all I have to do is figure out how hot is hot enough at 12v.  I
assume
> it wouldn't really have to be particularly hot.  Any ice inside the pitot
> would be catching the heat from all sides and anything on the outside
would
> form a slight insulation layer which would then allow undermining the ice
> where it adheres to the pitot surface.  Then again, that metal setting out
> front is going to loose heat like gangbusters.
>
> What to do?  What to do?
>
> Chuck Jensen
>
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Ronnie Brown
> Sent: Wednesday, October 01, 2003 3:20 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR:A (re)volting problem
>
>
> You could just run it off of 12 volts.  it will make half the heat it had
at
> 24 volts.  some pitot's get pretty hot, yours might make enough to melt
some
> of the ice.
>
> Another thought, some pitot's have replaceable elements.  Check and make
> sure yours can or cannot.
>
> I've seen Chuck's pitot, looks like it is gold plated to match his paint,
it
> would be a shame to scrap it.
>
> Ronnie
>
>
> ----- Original Message -----
> From: "Chuck Jensen" <cjensen@dts9000.com>
> To: <reflector@tvbf.org>
> Sent: Wednesday, October 01, 2003 4:11 PM
> Subject: REFLECTOR:A (re)volting problem
>
>
> | Looking for any ideas out there.  My Velo has a 12v system but a 24v
> pitot,
> | which was installed prior to my involvement.  Is there any way of
jumping
> | from 12v to 24v to drive the pitot, which draws a few amps.  The
reverse,
> | 24v to 12v, seems to be able to be done quite easily.  But going from
21v
> to
> | 24v seem problematic and I haven't discovered any great solutions.
> |
> | A second avenue of exploration is this Velo is equipped with two (2),
12v
> | batteries.  Is there a way of taking the 24v from the two batteries
> without
> | having a totally jerry-rigged system whose failure could potentially
make
> | both batteries inop?  The dual battery, even though I've never had to
> switch
> | to the second unit, is a degree of redundancy that I would not like to
> | compromise.
> |
> | Why not change out the pitot?  Well, the previous one was plated and
> fitted
> | for the plane, right on the pointy end of the plane and I kind of like
it.
> | Changing it out with a 12v unit would be a last resort.  Ideas?
> |
> | Chuck Jensen
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