Need help with prop selection

[iluvgear]

My boat is a 79 Glastron 16 foot trihull bowrider powered by a 78 Evinrude 85hp with an aluminum prop approximately 13 inches in diameter. The prop is banged up and I am trying to figure out the proper replacement. There is a stamping R5323 on the prop hub under the prop nut. I would appreciate any suggestions for a suitable replacement prop. Thanks in advance. Joe

 

[Spidybot]

Re: Need help with prop selection

Can't seem to figure out the prop specs from that number...<br /><br />Suggest you try the prop calculation sheet on www.dorthe.homepage.dk to get an idea.<br /><br />Your gear ratio is 2:1 and your rpm at wot is 4500-5500. Based on what rpm you reach at wot you can decide what prop you need (1" up in pitch equals 200 rpm down - and vice versa). A good prop shop should lend you a couple of test props.