flyrotary@lancaironline.net Mailing List Archive

Steve,

Going with your assumption that the rotary runs so smooth that isolation of the oil cooler is not necessary. Now suppose one rotor quits while at altitude (fouled plug, failed coil, plugged injector, etc.) and you have to find a place to land. The engine will be running very rough no doubt. The last thing you need at that time is a secondary emergency in the form of an oil fire. You're much safer to mount the oil cooler to the motor mount than to the engine. Just say'in.

Mark

On Thu, Jul 25, 2013 at 6:36 PM, Stephen Izett <steveizett@me.com> wrote:

Hi guys

Would really appreciate your thoughts here.
We made a decision way back to mount the oil cooler hard to the redrive being fed from the left cheek.
This was made on the basis of a belief that the rotary runs very smooth.
We recently built up the diffuser for it, trying to allow for some movement but I have significant concerns.

If we are going to shift it, now is the time!

I remember Mark S commenting on having mounted to the redrive (with some form of rubber isolation) then redesigned of the engine.

Key concerns are:
1. Vibration breaking one of the many joints in the cooler and subsequent high pressure oil flow and possible fire.
2. Seal between diffuser and core.

Thanks

Steve Izett
Glasair SIIRG with Renesis
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