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"Nearly in every airplane like a Cessna is a dry running rotary vane vacuum pump installed because of its reliably und they don´t have any seals." I'd agree that most light aircraft vane vane type vaccuum pumps but wouldn't agree on the reliablity.

How does a graphite housing stand up the combustion process? Have you Chromed your bore?

How do you do side seals? The smallest wankels (model engines) also don't need them if you control the housing thickness to very close tolerances. In a bigger engine, thermal expansion makes these clearances differcult to maintain.

The Apex seal issues of the early wankels were basically solved by the early seventies 12A's. The marketing need to inject a little sump oil rather than a more optimised two stroke type oil also leads to gumming up of the seals in their slots on the Mazda engines. Have you looked into springs behind your vanes to help your sticking issues?

Have you done any dyno work with varying intake and exhaust pipe lengths. Your design should benefit from harmonic tuning in a similar manor to the wankel. Here is a link to a very well done model dyno:

http://gallery.intlwaters.com/thumbnails.php?album=338
http://gallery.intlwaters.com/thumbnails.php?album=351