Just a friendly reminder, guys –
it is helpful if the ‘Subject’ heading bears some relationship to
the content. I know, we get into an interesting discussion and don’t
even look at the subject line. Of course I would NEVER do such a thingJ.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of George Lendich
Sent: Tuesday, July 07, 2009 2:36
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: INJECTION
OIL IN FUEL
I was well aware of that, but
wondered about the design Yvon was using and if he was running
it with an isolator and getting a feel for the life of the belt. Actually
using one on anything over 100hp and getting any reasonable life was news to
me, but I'm always willing to hear about anything new.
----- Original Message -----
Sent: Wednesday,
July 08, 2009 8:24 AM
Subject: [FlyRotary]
Re: INJECTION OIL IN FUEL
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
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?
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
----- 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