[ARC5] IF "overcoupling" in BC-453B

[Roy Morgan]

At 03:23 PM 2/7/03 -0700, Jim Mandaville wrote:
>Speaking of planes, can anyone tell me a bit about the power source for the
>28 vdc in single engine WW2 planes?  Did they have a DC generator and a
>battery for 28 v (13 wet cells?? :)?

Jim,

I can only tell you about the T-28 "Trojan" training aircraft which entered 
service in about 1950, and this is from memory over about 30+years:

Fore more info, see:

<http://www.t28cbuno146254.com/>
This first link had nice pictures. I can't tell you without looking at my 
log book if I flew this particular one, but I did land on the Lexington in 
one of them.

<http://www.wpafb.af.mil/museum/annex/an26.htm>
<http://www.warbirdalley.com/t28.htm>


The engine has a 28 volt DC generator that feeds all systems. The battery 
was a NICAD, not lead-acid.  There was a voltage regulator as part of the 
battery management system.  Certain instruments, such as fuel gauge and 
tachometers, need 28 or 115 volt ac 400 cycles, three phase. This was 
created from the 28 volts by a small inverter about the size of your fist..

The ones I flew had the ARN-6 navigation receiver that, as I understand, 
used 28 volts on the plates of the tubes and had no 
dynamotor.  The  communications radio(s) had dynamotors for the B+  plate 
supply.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
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