Yamaha 6 and 9 hp propeller question

[Philip Botha]

Good day Everyone.I own a 96 ,6hp two stroke,and a 2006/7 9.9hp four stroke. I recently obtained a short shaft four stroke portable 6hp. The prop is so much smaller than the other two,will that motor push my inflatable as efficiently as my 6hp two stroke?Any input anyone?

[panasonic]

I would say you will have try it yourself and let us know what happens. It would be interesting to see on those small engines.