Mailing List flyrotary@lancaironline.net Message #42553
From: George Lendich <lendich@optusnet.com.au>
Subject: Re: [FlyRotary] Re: the Kubota dynamo
Date: Mon, 28 Apr 2008 09:39:55 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Scot/Michael,
Why not run a light rather, like they do on Motorbikes rather than dump excess power.
George ( down under)
Scott:
 
Mark Langford's example shows what most folks are doing for a schematic for the John Deere dynamo. It can be seen on his page here:
 
and here are the specifics on the dynamo set up
 
The Kubota unit has the same output as the JD though it is slightly different in size, and is made by the same folks Kokusan Denki in Japan.
 
As for running dual units I have not crossed that hurdle yet but I know folks have done it so there has to be a reasonable way to make it happen. As I understand the permanent magnet uses a heat sink to dump unused power. I obtained these heat sink regulators from the same source on ebay that sold me the dynamos. They are removed form brand new tractors when the customer orders more lights and the units are replaced with a higher output conventional alternator.
 
Michael
 
----- Original Message -----
Sent: Sunday, April 27, 2008 4:56 PM
Subject: [FlyRotary] Re: the Kubota dynamo

So that's cool.
What about the regulator and wiring diagram?
I got a John Deere PM alternator (that looks similar to yours) and regulator from different ebayers. I would like to use it as a backup source instead of two batteries.
Figuring out the regulator wiring is slowing me down while I go thru the first engine runs etc. maybe I won't use it.
I always thought a Harley style PM alternator could be fit between the engine and the reduction gear? The amp rating should be equal to the esential loads, because extra generator capacity is 'spilled' by the regulator as wasted energy. The 'main' alternator can turn off it's field current if no additional power is required.
Scott E



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