----- Original Message -----

From: Mark Steitle

Sent: Wednesday, May 12, 2004 11:57 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Alternator pulley size

 

At 11:45 AM 5/12/2004 -0400, you wrote:

 

----- Original Message -----

From: Bill Dube

Sent: Wednesday, May 12, 2004 10:24 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Alternator pulley size

 

At 09:29 PM 5/11/2004 -0400, you wrote:

>I found alternator from Prelude with much larger pulley than the stock

>Mazda.

         Don't Honda engines spin "backwards"? Will this be a problem when

using a Honda alternator on a rotary?

Not that a pulley cares which way it turns, but Alternators are AC devices internally and don't care which way they turn either.  A rectifier converts AC to DC for the external world.

Tracy

Don't some alternators have internal or external fans that need to turn a specific direction in order to cool properly?

Mark S.

Its possible that the fins on the centrifugal fans could be canted to optimize them for direction.  A look at a sample in my junk pile looked symmetrical so should work in either direction. 

 Hope everyone takes all comments made on this and every discussion group in the spirit of "your mileage may vary".   This stuff is not carved in tablets of stone and should always be sanity checked for your application.

Tracy