I can't get my head around that one. To my
way of thinking the jets supply cooling oil to the rotor, when the rotor is
full it is in best balance. If the jest didn't open until very high RPM the
rotors wouldn't be getting cooled ( I guess that's good for fuel
atomization) or be in best balance and the rotors would probably have no oil
in them at all thought centrifugal force slinging the oil out. The oil
spilling from the rotor also feed the fixed rotor gear. No oil, no gear
lube and rotor not in best balance.
To me your statement doesn't ring true. I must
accept what Lynn says, in that they open with RPM - but what RPM, surely not
very high RPM. However I stand to be corrected.
FWIW,
When I was rebuilding
my Renesis, I had planned to install the jets. I purchased them from
Atkins against their recommendation. I bounced it off Tracy, and he concurred
with Atkins. Their contention was that the jets were more for auto
racing applications (very high rpm’s).
Bryan
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Jeff Whaley
Sent: Tuesday, October 06, 2009 3:45
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Seepage, no
more. Oil system
Hi
Lynn, with regards to your high-lighted comment about the check balls in the
crank – that is one item Bruce Turrentine suggested be removed in an overhaul
for aircraft applications, replacing the balls with a carburetor jet to allow
oil flow right away and continuously. So, I did install carburetor jets in my
e-shaft during rebuild. Any comments? Anybody else out there do the same
thing? Just curious as I’m fighting high oil
temps.
Jeff
Plus,
the rotary is cold blooded. The big bearings stress the oil film to no great
extent, and the major source of oil temperature is rotor cooling. At low
speeds and idle, the check balls in the crank don't even open to allow cooling
oil to spray into the engine. Those balls operate as a function of RPM not
temperature.
On the other hand, you
will get a water temperature increase within one minute of startup. A
water based coolant has very low viscosity and flow to a distant heat
exchanger will be immediate. Like the rear heater in my school
bus.
Lynn E.
Hanover