Always something interesting with Find Hansen:
https://www.youtube.com/watch?v=Gq8Q-5AJ9mU
Another, variable compression opposed piston engine.
https://www.youtube.com/watch?v=SL1uwRtqPWE
https://www.youtube.com/watch?v=Gq8Q-5AJ9mU
Another, variable compression opposed piston engine.
https://www.youtube.com/watch?v=SL1uwRtqPWE
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