Mailing List flyrotary@lancaironline.net Message #47032
From: George Lendich <lendich@aanet.com.au>
Subject: Cog belt PSRU
Date: Thu, 9 Jul 2009 08:51:05 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
 
 Michael,
Nice find, I do have some reservations however. There appears to be no damper, I can't see how the belt is tensioned and I would like to see both cog wheels supported on both sides. It is nicely made and the engine mounts and isolators look good.
George (down under)
Bernie: 
 
Here is one for you
 
 
 
 
Produced in Brazil by Altair Coelho a well known aircraft designer in down there for the VW 4 inline engines as found on the Jetta and Golf here
 
Michael in Maine (where its raining again)
 
 
 
 
----- Original Message -----

This is excellent reading, Bill!  Maybe this should have its own heading, like "Cog Belt PSRUs".

I've been collecting pictures and descriptions of cog belt PSRUs just for my own information, looking at different examples. Plus looking at other types of PSRUs, this is the way I started to understand that COG BELTS CANNOT BE USED TO ISOLATE TORTIONAL VIBRATION. One thing that bothered me - unless most of the anti-vibration couplers were very cleverly hidden, I did not see any at all, because the input cog pulleys all looked like they were mounted directly onto the flywheel. How come? Unless I'm really, REALLY missing something. What say you?
Bernie.
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