REFLECTOR:A (re)volting problem

Al Gietzen reflector@tvbf.org
Wed, 1 Oct 2003 23:08:58 -0700


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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

 

I haven't followed this and had deleted most of the topic before I read
enough to realize I may have some marginally relevant info.  I installed
a 24v pitot (AN 5813-1) made by Aero Instrument in the nose of my
Velocity. In my installation less than 2" of it is exposed, so it should
only need about half as much heat.  It is insulated from the fiberglass
by one layer of Cool-Mat insulation.

 

 Before I installed it I did some testing - connected it to a 12 volt
battery and first determined that it would not overheat the fiberglass
through 1 layer of Cool-Mat if turned on when not in flight; just
natural convection.  It got very hot but through the layer of Cool-mat
it was just a bit too hot to touch. OK.

 

Then checked it with while running 40 degree water over it.  It stayed
quite warm.  I concluded it would work just fine.

 

Al


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<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>Chuck,</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>Before
fixing your problem, determine whether you actually have one!&nbsp; =
Clip</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>or
safety-wire a thermocouple to the pitot and go fly on a cold day.&nbsp; =
If the</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>heater
can keep the pitot at 100 degrees Fahrenheit, you don't have =
a</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>problem.&nbsp;
If it can't, a little insulation on the lower part (or reduce =
the</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>extension
out the nose) may do the trick with no electrical =
change.</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>Keith</span></font></p>

<p class=3DMsoPlainText><font size=3D2 face=3DNimrod><span =
style=3D'font-size:11.0pt'>&nbsp;</span></font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblue face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>I =
haven&#8217;t followed
this and had deleted most of the topic before I read enough to realize I =
may
have some marginally relevant info. &nbsp;I installed a 24v pitot (AN =
5813-1)
made by Aero Instrument in the nose of my Velocity. In my installation =
less than
2&#8221; of it is exposed, so it should only need about half as much =
heat.&nbsp;
It is insulated from the fiberglass by one layer of Cool-Mat =
insulation.</span></font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblue face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></=
font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblue face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>&nbsp;Before I =
installed
it I did some testing &#8211; connected it to a 12 volt battery and =
first
determined that it would not overheat the fiberglass through 1 layer of
Cool-Mat if turned on when not in flight; just natural convection. =
&nbsp;It got
very hot but through the layer of Cool-mat it was just a bit too hot to =
touch.
OK.</span></font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblue face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></=
font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblue face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>Then checked =
it with while
running 40 degree water over it. &nbsp;It stayed quite warm.&nbsp; I =
concluded
it would work just fine.</span></font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>&nbsp;</span><=
/font></p>

<p class=3DMsoPlainText><font size=3D2 color=3Dblack =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:black'>Al</span></fon=
t></p>

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