Re: volvo duo prop counter rotating
Do you have a nearby propellor shop ? Take the boat over & ask for their advice and a set " loaner props " to see if it does the job. Be DAMM SURE you do not over speed the motor!!!
Also. if the motor does not reach very close to full rpm. Remember the maximum RPMs to tell the prop shop. 2 props ARE A DEFINATE EXPENSE. So use a place that HOPEFULLY has some duals to loan you. Any set would be good. Good shops know what is close or a engine that is tired & needs some work.