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A couple of things about this -- If you are
referring to Greg Richter's article on aircraft wiring (the link below seems
broken): He founded Blue Mountain Avionics and the EFIS. I found out the
hard way that if the voltage drops below about 11 volts, the EFIS-1 starts to
act up, and if it goes to below 10 volts it causes damage to the power supply
requiring replacement and recalibration at the factory. Blue Mountain is now out
of business.
Re: Teflon or Tefzel -- the Tefzel was designed for
aircraft use, and is tougher than Teflon, and easier to strip. There was
extensive discussion on the Aeroelectric list about this, and Bob Nuckolls
recommends Tefzel. I side with Bob over Greg on this issue.
Bill Schertz
KIS Cruiser
#4045
N343BS
Phase I testing
Sent: Saturday, December 05, 2009 7:08 AM
Subject: [FlyRotary] Re: Primer in AC/DC Electricity - Wire
Types
Jeff,
Teflon wire is more prone to cold flow in that the
insulation will move at room or cold temps when the wire is excessively
restricted. This also caused one of NASAs launch vehicles to fail. I
prefer the PVC insulation. It is readily available in different colors and
the heat ceiling is so high that if the insulation sees that kind of a temp your
AC might be on fire. Proper fusing and wire routing is more important than
insulation melting points. Just my opinion.
Joe Berki
Limo EZ
----- Original Message -----
Sent: Friday, December 04, 2009 11:20
PM
Subject: [FlyRotary] Re: Primer in AC/DC
Electricity - Wire Types
I read thru Greg’s
paper and found it very interesting. He recommends Teflon wire as
opposed to Tefzel wire.
I’m wondering: what
are the main differences between the two types of insulation. I remember
reading something about Teflon being softer or less durable – but I don’t
remember the details.
Are there any
A&P/EE’s out there who want to tackle this question? (mere mortals can
also feel free to respond as well ;)
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Friday, December 04, 2009
14:57
To: Rotary motors in
aircraft
Subject: [FlyRotary]
Re: Primer in AC/DC Electricity
George,
He is probably not talking to folks who install an
electrically dependant alternative engine. If you just forget the
problems that might arise getting Tracy’s controllers, etc, and the 12V auto
starter to work on 24V, you still have to accept the fact that that “big 24V
battery” can fail. If is does and you don’t have a second battery, it
will get very quiet in the cockpit until the screaming starts. Also
don’t forget that the only way you can get a 24V battery is to tie two 12V
batteries together. If you go with one 24V battery, you have the same
battery weight plus the weight of redundant busses. If you go with two
batteries, you now have 4 times the weight of one 12V battery. If you
try to mix the systems so you have 24V and 12V, you have a
nightmare.
The only real advantage seems to me to be wire weight
(smaller wire for 24V). I am pretty sure that I ate more weight for last
nights dinner than the entire wireing system in my plane
:>)
If you really want to save weight in your plane, go on
a diet! (I don’t want to hear that you are 7 feet tall and weigh 120
lbs! :>))
Bill B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of George Lendich
Sent: Friday, December 04, 2009 3:45
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Primer in AC/DC
Electricity
Being electronically challenged I
had a quick look. It says 24 volts is better for aircraft use eliminating the
need for extra batteries and alternator, I'm wondering why builders
collectively don't already go that way. Are there complications or additional
expenses to be considered or are auto conversions typically locked in to a 12
volt system for one reason or another - perhaps just the
alternator.
Some of you may have already seen this and to others this may be
knowledge that you carry
around in your head and use everyday but to someone
like me whose schooling in AC/DC
(Navy)
electricity was 50 plus years ago and also something
I do not use everyday the following link
has
refreshed my old brain..............Hope some of the
group finds it useful..............
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
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