First time we test on an engine just with the overhang and this itself gave 0.3 hp, but on the last engine we just add hydro diode and not measure this mod alone.
C is most unrestricted port for reversion on reed engines , shortest of all with nearly to vertical angle, very comfortable for ex gases and for back pressure from the pipe at wrong time. A and B usually shape have some restrictions, especially with sharp A B widows upper edges.
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