I do have a wellcraft 18sx 1996 volvo penta 3.0 gs/sx.<br />With the current prop 14,5x19 alu the wot rpm's are ok (4650).<br />If i want to change to a 3 blade stainless to get more performance what size do i need, also like the keep the proper rpm's at wot.<br /><br />Regards <br />Peter<br...