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prop size
greenshoe	#1  Posted on 09/05/08 - 3:22 PM
Member Posts: 23 Comments: 0 Joined: 11/26/07	I need help on what size propeller to choose for my 2008 Yamaha 90 HP. It is going to be mounted on a 1981 Montauk. The boat will be used for fishing in and around Boston Harbor. No water skiing, two to three people with equipment, cooler in front with a couple beers, battery in console. I would like the size for a stainless and aluminum propeller. I hope I gave enough information. This is a great site for getting information. Edited by Tom W Clark on 09/05/08 - 10:19 PM
kamie	#2  Posted on 09/05/08 - 4:53 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Need more info, what prop is on there now? How fast and what are the RPM's at WOT?
John Fyke	#3  Posted on 09/05/08 - 5:07 PM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	You need to talk to Tom Clark. Edited by Tom W Clark on 09/05/08 - 10:21 PM John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.
greenshoe	#4  Posted on 09/05/08 - 5:34 PM
Member Posts: 23 Comments: 0 Joined: 11/26/07	kamie- motor being put on this this week just need some info about prop selection.
Tom W Clark	#5  Posted on 09/05/08 - 5:38 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	WHICH 2008 Yamaha 90 HP outboard?
greenshoe	#6  Posted on 09/05/08 - 6:57 PM
Member Posts: 23 Comments: 0 Joined: 11/26/07	Tom Clark -- It is a 2008 90 hp 4 stroke Yamaha. Edited by Tom W Clark on 09/05/08 - 10:21 PM
Tom W Clark	#7  Posted on 09/05/08 - 10:13 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	OK, well let's think about this. The 2008 Yamaha 90 HP four stroke has a 2.31:1 gear ratio, a 6000 RPM redline and uses a 4-1/4" diameter hub propeller. Furthermore, we know from long experience that a classic Montauk with 90 HP is capable of 42-46 MPH, give or take. This suggests that a propeller with about 19" of pitch is going to fit the bill. Looking at the readily available propeller models with the intermediate 4-1/4" hub we can make some recommendations based on what has been proven to work well. If you want a Yamaha prop, try the 13" x 19" Painted Stainless Steel Prop or the 13-1/4" x 18" Performance 3 Series (essentially a Stiletto Advantage.) Edited by Tom W Clark on 09/05/08 - 10:15 PM