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Sure, it has inherent sealing issues, but none that weren't already solved through several generations of the wenkel rotary and the new rotax. The answer - at seal points: apex seals. Most common material: teflon. I'm an electrical engineer and don't dive much into mechanics, but here's what I see being a problem and a comparative example: The wenkel rotary motor always overheated simply from the friction created from the rotation of the rotors in the rotor housing. In this design, "rotor" contact with the housing is present 100% of the time throughout operation. I counted 8 separate motions where the ball-piston structures were moving and in contact with the housing. My bet, this thing will never, ever, ever stay cool. It will heat up, seals will melt away and bam - detonation.
 
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