Russell Kent wrote:

Paul,
The chart you sent ("Fig.22 Relation between apex seal and lubricating oil
volume") seems to indicate little cooling benefit beyond 80 cc/hr/bank at
6000RPM. [WOT]  That's 2.4 oz/hr/bank. I am not clear how they define "bank": is
that rotor, or apex?

I tried to compute what the lubricating volume is for a hypothetical aircraft
rotary.  Assumptions:

  1. Fuel burn is 10 gal/hr (YMMV, literally)
  2. Engine is a two-rotor
  3. Two-stroke oil introduced to fuel at the rate of 2 oz/gal (64:1 ratio)I

If "bank" means "rotor", then you are consuming 10 oz/hr/bank (almost 300
cc).  If "bank" means "apex", then you are consuming 3.3 oz/hr/bank (almost
100 cc).

Obviously, mixing two-stroke at 1 oz/gal (128:1) would halve the above
consumption figures.  If "bank" means "rotor", then you're still ok, but if
"bank" means "apex", then you're only getting 50 cc, which isn't good for 4000
or 5000 RPM [WOT], and appears to be very bad for 6000 RPM [WOT].

Russell Kent

I think it means rotor.

Paul
 
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