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Propping a Honda BF75 on a Montauk
kamie	#61  Posted on 10/19/09 - 5:28 AM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	sounds like your right on. 5600 is the middle of the range. I would stick with it.
Eastport3338	#62  Posted on 10/21/09 - 1:34 PM
Member Posts: 13 Comments: 0 Joined: 05/18/08	Insted of starting a new thread I thought I would ask my question on this thread. I have a 2005 Honda BF75A outboard that has a 3X13.25X17 prop and I am only able to get 5,000 rpm at WOT with a speed of 29-30 MPH. I boat at Lake Tahoe with a surface elevation of 6,223'. What pitch would allow me to achieve 5,500 RPM. I would like to thank you in advance for any help.
Joe Kriz	#63  Posted on 10/21/09 - 1:41 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Eastport3338, Paul is running a 15 pitch prop to get the 5600 RPM's at WOT... You may never achieve his exact statistics as he is at Sea Level and you are above 6,000 feet but I would definitely try the 15 pitch and see how it works for you.
Tom W Clark	#64  Posted on 10/21/09 - 2:51 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Eastport3338, You will need to drop to a 15" pitch prop to get your BF75 to 5500 RPM. Your 75 HP outboard is only putting out 60-65 HP at that altitude, so 29-30 MPH is pretty good. To discuss the special accommodations of outboards used at altitude, please start a new thread; it is usually better to start a new thread than to piggyback on an old (and very long) one.