Probably not noticeably at high RPM because the rotary is reputed
to run at high RPM without apex seals.

Research at Curtiss Wright and Deere led to the hypothesis that engines running at VERY high speed
might work without apex seals, but this was never tested. I would guess that the equivalent speed
for a 13b where this might work would be above 20,000 RPM. I can tell you that a large (5.8liter
per rotor) engine operating at 3600 RPM (equivalent to a 13B speed of about 7200RPM) will make
zero power with malfunctioning apex seals.

Has anyone seen the Graupner RC engine? What does it have for apex seals?

I have no experience with the trailing hole modification.

Jon Lauter
Rotary Power Marine Corporation
www.rotarypowermarine.com

 
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