REFLECTOR:A (re)volting problem

Laurence Coen reflector@tvbf.org
Sat, 4 Oct 2003 12:24:14 -0500


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Chuck,

I have the same unit, sans plating.  The reason that the breaker pops is =
that the normal current is about 25 amps.  The normal internal =
resistance is about 0.5 ohms.  You need #10 wire and a 30 amp breaker to =
run that sucker.

Larry Coen
SE/RG Franklin

PS: It only takes about 5 seconds on the ground to get it too hot to =
touch.  I'm thinking of a voltage converter that reduces 12 volts to 6 =
volts.
  ----- Original Message -----=20
  From: Chuck Jensen=20
  To: 'reflector@tvbf.org'=20
  Sent: Saturday, October 04, 2003 10:18 AM
  Subject: RE: REFLECTOR:A (re)volting problem


  From some Reflector postings and off-line comments, it seemed highly =
unlikely that there wouldn't be any markings on the "impossibly put =
together pitot".  Apparently, in the plating process, enough metal was =
displaced that the only way to see the manufacturer's imprint was to =
position a light just-so and hold your mouth just right.  On the plane, =
it looked perfectly smooth on both sides where the imprint was.  It took =
a few attempts but I was able to glean the following information:

  Kollsman Mfr No. 369D-011
  AN5816-1, 12-16v
  Patent Canada, 1940
  Patent No. 2.204.367

  In checking the web, this AN5816-1 number corresponds to pitots used =
in some old warbirds, though it wasn't possible to tell which ones.  =
More currently, that number was used in Aerostars and Piper Aztecs.  =
It's called a "sharkfin pitot" due to the, well, sharkfin looking sail =
on the top of the pitot.    Equally surprising, it truly is a 12v pitot, =
not 24v as I was told.  The heavy current draw was from an internal =
short that became apparent as I did more testing; apparently incurred =
during the plating process.  Nonetheless, Dave Black's, et al, discourse =
on epower and ecurrent was interesting and informative.  I'll post a =
couple photos when I get the USB working again.  However, anyone that =
has any idea in how to break into this thing would be most welcome to =
pass along suggestions.  I really want to repair/salvage it if I can.

  On a different note, Jim now has me skeptical and fearful about flying =
near a cloud in a plastic plane.  I'm ever so thankful for the many =
times I must have already cheated death's grip.  My personal minimums =
have now gone up to 20,000 overcast with 10 mile visibility and low =
humidity!!=20

  Chuck Jensen, in East Tennessee where gaming Jim is the sport of the =
day.

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<DIV><FONT face=3DArial size=3D2>Chuck,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I have the same unit, sans =
plating.&nbsp; The=20
reason that the breaker pops is that the normal current is about 25 =
amps.&nbsp;=20
The normal internal resistance is about 0.5 ohms.&nbsp; You need #10 =
wire and a=20
30 amp breaker to run that sucker.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Larry Coen</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>SE/RG Franklin</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>PS: It only takes about 5 seconds on =
the ground to=20
get it too hot to touch.&nbsp; I'm thinking of a voltage converter that =
reduces=20
12 volts to 6 volts.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dcjensen@dts9000.com =
href=3D"mailto:cjensen@dts9000.com">Chuck=20
  Jensen</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
  href=3D"mailto:'reflector@tvbf.org'">'reflector@tvbf.org'</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, October 04, =
2003 10:18=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:A =
(re)volting=20
  problem</DIV>
  <DIV><BR></DIV>
  <P><FONT face=3DArial size=3D2>From some Reflector postings and =
off-line comments,=20
  it seemed highly unlikely that there wouldn't be any markings on the=20
  "impossibly put together pitot".&nbsp; Apparently, in the plating =
process,=20
  enough metal was displaced that the only way to see the manufacturer's =
imprint=20
  was to position&nbsp;a light just-so and hold your mouth just =
right.&nbsp; On=20
  the plane, it looked perfectly smooth on both sides where the imprint =
was.=20
  &nbsp;It took a few attempts but I was able to glean the following=20
  information:</FONT></P>
  <DIV><FONT size=3D2><FONT face=3DArial>Kollsman Mfr No.=20
  369D-011</FONT></FONT></DIV>
  <DIV>
  <DIV><FONT size=3D2><FONT face=3DArial>AN5816-1, =
12-16v</FONT></FONT></DIV></DIV>
  <DIV><FONT size=3D2><FONT face=3DArial>Patent Canada, =
1940</FONT></FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>Patent No. 2.204.367</FONT></DIV>
  <DIV><FONT size=3D2><FONT face=3DArial></FONT></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2><FONT face=3DArial>In checking the web, this =
AN5816-1 number=20
  corresponds to pitots used in some old warbirds, though it wasn't =
possible to=20
  tell which ones.&nbsp; More currently, that number was used in =
Aerostars and=20
  Piper Aztecs.&nbsp; It's called a "sharkfin pitot" due to the, well, =
sharkfin=20
  looking sail on the top of the pitot.&nbsp;&nbsp;&nbsp; =
</FONT></FONT><FONT=20
  face=3DArial size=3D2>Equally surprising, it truly is&nbsp;a 12v =
pitot, not 24v as=20
  I was told.&nbsp; The heavy current draw was from an internal short =
that=20
  became apparent as I did more testing; apparently incurred during the =
plating=20
  process.&nbsp; Nonetheless, Dave Black's,&nbsp;et al, discourse on =
epower and=20
  ecurrent was interesting and informative.&nbsp; I'll post a couple =
photos when=20
  I get the USB working again.&nbsp; However, anyone that has any idea =
in how to=20
  break into this thing would be most welcome to pass along =
suggestions.&nbsp; I=20
  really want to repair/salvage it if I can.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>On a different note,&nbsp;Jim now has =
me=20
  skeptical and fearful&nbsp;about flying near a cloud in a plastic =
plane.&nbsp;=20
  I'm ever so thankful for the many&nbsp;times I must have already =
cheated=20
  death's grip.&nbsp; My personal minimums have now gone up to 20,000 =
overcast=20
  with 10 mile visibility and low humidity!! </FONT></DIV>
  <DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>Chuck Jensen, in East Tennessee where =
gaming Jim=20
  is the sport of the day.<BR></FONT></DIV></BLOCKQUOTE></BODY></HTML>

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