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nuckolls.bob(at)aeroelect
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 Posted: Tue May 25, 2021 7:01 am Post subject: "Contactor Questions" , battery in the trunk, now Ground |
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At 04:59 PM 5/24/2021, you wrote:
| Quote: | | Is this external power receptacle on a Western airplane? Or a Yak/CJ? |
There have been a number of connector styles adapted
to ground power service on aircraft. The military
was fond of the 3-pin configuration with wiring as
illustrated in View-A of:
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z31K.pdf
The small pin is shorter than the other two
power conducting pins. This pin was used to control
a ground power contactor such that the contactor
would NOT close until the main power pins were engaged.
Conversely, upon disengagement the contactor WOULD
open before the main power pins broke contact.
This prevented arcing/burning of the power pins
should connect/disconnect operations be conducted
with a potential for high current flows.
View-B illustrates a more pedestrian approach
to ground power. This single pin connector was
common to terrestrial vehicles manufactured
by Cole-Hersee and perhaps others. I think
Piper was the first to offer this connector
on their product line.
Virtually every FBO ground power cart I've encountered
has two cart-to-aircraft cables: One with the mil-spec
3-terminal plug, a second with the Mack-truck style
plug.
I'm aware of a short-lived, single pin ground power
connector that Beech used for a time waaayyy back
when.
http://www.aeroelectric.com/Pictures/Connectors/AeroStart/
I think this ground power combo was offered on
some Beech models. A 'jumper cable' was supplied
with each airplane 'cause few if any FBOs had
mating plugs on their ground power carts.
The clips are kinda flimsy for engine cranking
currents. I suspect this cable's primary utility
was to charge the ship's battery from a nearby
vehicle whereupon the engine could be started
using internal battery power.
There may be others out there but the two
styles illustrated in Z31 are the most prevalent
in the wild.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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prestonkavanagh
Joined: 27 Nov 2018
Posts: 16
Location: Tarpon Springs
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| Posted: Sat May 29, 2021 8:28 am Post subject: shore power |
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Bob's write up made this a fun little project, now easily accessed while hidden away under a rear seat.
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PA-12, BD-4, RV6a, gliders, Rutan canards |
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