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Date: Thu, 7 Jan 2010 09:20:56 -0800
Message-ID: <1c23473f1001070920m7d03702erfb00fbb6ed865d0e@mail.gmail.com>
Subject: High voltage problem fixed for real
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I finally figured out why my voltage had been creeping up - I was losing a
small bit of voltage with each crimp and connection and section of wire in
the alternator field circuit (went from the main buss, through a fuse, 4' to
a switch, then 4' back to the alternator.  That added up to 0.4 volts over
the length of the circuit when the field was drawing 3.5 amps.  If that draw
ever goes up in flight the voltage drop would be higher.  More
importantly there was a bad crimp in the b-field wire which would have been
causing an obvious drop in voltage between the alternator output and the
rest of the electrical system.

I fixed the crimp and installed a relay near the alternator to handle the
field voltage.  This not only got my operating voltage back down to 13.8
volts, but also removed the last bit of alternator noise from the headsets.
Cool!

Live and learn.
-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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<div>I finally figured out why my voltage had been creeping up - I was losi=
ng a small bit of voltage with each crimp and connection and section of wir=
e in the alternator field circuit (went from the main buss, through a fuse,=
 4&#39; to a switch, then 4&#39; back to the alternator.=A0 That added up t=
o 0.4 volts over the length of the circuit when the field was drawing 3.5 a=
mps.=A0 If that draw ever goes up in flight the voltage drop would be highe=
r.=A0=A0More importantly=A0there was a=A0bad crimp=A0in the b-field wire wh=
ich would have been causing an obvious drop in voltage between the alternat=
or=A0output and the rest of the electrical system.=A0</div>

<div>=A0</div>
<div>I fixed the=A0crimp and installed a relay near the alternator to handl=
e the field voltage.=A0 This not only got my operating voltage back down to=
 13.8 volts, but also removed the last bit of alternator noise from the hea=
dsets. Cool!</div>

<div>=A0</div>
<div>Live and learn.=A0<br>-- <br>David Leonard<br><br>Turbo Rotary RV-6 N4=
VY<br><a href=3D"http://N4VY.RotaryRoster.net">http://N4VY.RotaryRoster.net=
</a><br><a href=3D"http://RotaryRoster.net">http://RotaryRoster.net</a><br>=
</div>

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