Hi Troy,

I face a slight problem with all my YS engines including the YS-160 DZ. When I am inverted and I try an upline from inverted, and then a humτpy bump, at the top of the HB where I push the elevator the engine seems to become very rich at full throttle and lots of smoke coming out. When I try an upline from straight and level at full throttle the engine pulls like a rocket, and don't notice any severe smoke.

Any explanation for that?

Something else, I currently use on my 160 an APC 16x12, I plan to replace it with a Mejzlik 17x10 (the best option would be 17x11 but is not available), on the other hand the 18x10 is quite big for my plane. Would you consider the Mejsliκ 17x10 a good prop or is it small? I know that the rommended prop is the APC 17x12, but Mejsliκ is about an oz lighter than APC.

Thanks and regards,

Nikos