Prop Slip Calculation

@ Dieter .... The problem with a reliable service engineer and spares with the SUZUKIS exists in Greece. This is the reason I am waiting to see if it will improv in the next year or so. If not I will go for Yamahas

@ Nordi ... Thanks very much .... Is as you say and I completely agree with you.
I may try a prop I just bought Yamaha Slatwater Series II 15 3/4 x 15. If this doew not work I will try any prop 14 and something x 17 see if this is better.

WIll let you know guys what happens.

Many Thanks fpr all your help