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George,
The tooth belts DO NOT isolate TV. The only way you would get any isolation is to use a multiple "V"belt and they must be a matched set to work at all well. They have a short life too. The HTD belts have a Arimid fiber belt that is stronger than steel for the same weight. THESE BELTS CANNOT BE USED TO ISOLATE TORTIONAL VIBRATION. Sorry to shout but this is a common idea and needs to be squashed out of everybodys head ASAP. If you run one of these belts you will still need a lovejoy or Centaflex doughnut for TV. You must still be sure the system isn't in the normal TV range for the engine/system.
Everybody should put BD-5 and Tortional Vibration in their search engine. It makes for very interesting reading.
Bill Jepson
-----Original Message-----
From: George Lendich <lendich@aanet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Jul 7, 2009 2:44 pm
Subject: [FlyRotary] Re: INJECTION OIL IN FUEL
Yvon,
I would be interested in how this works for you in terms of life of belts etc. I would also be interested in the design for my single rotor. Do you incorporate torsional vibration isolators or rely on the belt to do that work?
George (down under)
Allo Bernie
The cog-belt PSRU that I fly is based on Richard Finch's 1986 design. I had some parts made by a machine shop and I put it together myself and adapted it to my 13B engine. The belt and sprockets are Gates Poly Chain GT products. RPM sprocket limit 3200 rpm. Gates rates the belt HP limit at about 150 HP
Yvon
----- Original Message -----
Sent: Friday, July 03, 2009 1:56 PM
Subject: [FlyRotary] Re: INJECTION OIL IN FUEL
Sorry, I don't have an answer, but I would like to know more about your cog-belt PSRU, who makes it and what are the operating limits (like HP limit, RPM limit, etc.). Thank you. Bernie
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