Hello;


Why not aluminium prop for ventilated drive, for example on outboard and with jack plate?

I'm going to say flex.

Geometry of aluminum propellers is not as performance oriented as stainless to begin with.
Then, cups can not be maintained and wash out much more quickly than stainless.
And, yes the blades flex much more than stainless.

This doesn't mean you wont get thrust from aluminum props but the performance will match the price.

Brett