Tracy Crook wrote:

Is there a relationship/ formula that shows the relationship of octane
to BSFC?  What would be the minimum octane for a rotary?  See ya in
Oshkosh.

Barny

If there is I don't think it is a strong relationship with a fixed
compression ratio. The compression ratio does not seem to be as
important in a Wankel rotary. The rotary reputedly will run on kerosene
if you can get it started. Aircraft people run anything from car gas
through 100LL aircraft fuel quite happily. I don't know
if Tracy has ever run low octane car gas. Tracy?

Paul Lamar

I haven't run anything  *but* low octane (87)  auto fuel.  Somewhere in
Yamamoto's stuff it mentioned a minimum octane of 68 for WOT operation.
That was with a C/R of 9.4 - 1 I think.  With no hot exhaust valve to
encourage preignition or detonation, the octane requirements are quite
modest.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

 
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