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Wrong Prop ???
heimtun	#1  Posted on 08/06/16 - 6:15 AM
Member Personal Page Posts: 97 Comments: 0 Joined: 06/03/16	I'm still sorting out the boat we got a few weeks back. It's a 1962 Sakonnet with a 1998 60 hp Merc 2 stroke. The prop is in ok shape but I thought I'd do some research on it. The number stamped (molded in) on the prop is 48-73144A40 - according to the Merc manual, this prop is for boats up to 15' weighting up to 1000 pounds gross. So, our boat is longer than 15' and I'm rather confident that the gross weight is way over 1000 pounds. How much of an issues is this potentially wrong prop? What am I loosing/hurting with this prop? What would I gain with a properly matched prop? Thanks in advance! Wayne
Phil T	#2  Posted on 08/06/16 - 7:14 AM
Administrator Personal Page Personal Album Project Albums Posts: 6985 Comments: 6 Joined: 03/26/05	It could be the right one, or not. There are dozens of props that are appropriate. To know if yours is, we we need to know: Wide open throttle (WOT) rpm's with the boat empty and just the operator. What is the WOT speed via GPS? What do you expect to be your typical (65% of the time) load of passengers/freight/gear/supplies?
heimtun	#3  Posted on 08/06/16 - 8:06 AM
Member Personal Page Posts: 97 Comments: 0 Joined: 06/03/16	Thanks PhilT - I'm going to need a tach first befor I can give feedback. I was just going by a page out of the Merc manual. I'll reply again when I can provide more info.
Joe Kriz	#4  Posted on 08/06/16 - 1:24 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11429 Comments: 452 Joined: 03/18/05	Yes, a Tach is a must have when setting up your prop. There are some things you can tell us now while you wait for your tach. 1. Where is the motor mounted? http://www.whalercentral.com/articles...cle_id=106 2. What is your top speed via GPS?
heimtun	#5  Posted on 08/06/16 - 1:51 PM
Member Personal Page Posts: 97 Comments: 0 Joined: 06/03/16	Thanks for the help Joe. My Merc is mounted in the middle hole on the top set and four up from bottom on bottom set (see photo in personal page - still having some issues uploading photos to threads) If I'm reading my GPS correctly, our top speed GPS speed was 29+mph. We are still dialing in the GPS and I'm not 100% sure we are interpreting it correctly. Regards, Wayne Edited by heimtun on 08/06/16 - 1:58 PM
Joe Kriz	#6  Posted on 08/06/16 - 2:10 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11429 Comments: 452 Joined: 03/18/05	The engine height looks in the ball park and so does your top speed. I am not sure if you can do too much better than 30 mph with a 60hp motor. Maybe others with a 60hp motor can tell you their top speed.