Your assumptions looks more accurate to me so I think 14X11 will give me the best option, I just want to make sure I don't get to a under reved situation with 14X11. If this was correct this would imply increasing by 1 inch dia = 2.5 X 200 rpm = reduction of 500rpm on my current situation = 4000-500= 3500 which is close to max 3600rpm.
#14X11 INBOARD PROPELLER SERIES#
Large Offshore Boats, XTO OS, Saltwater Series II. One other piece of info I came across is that increasing 1'' in Diameter is = to a pitch increase of 2.5''. Currently SDS is available on the following Yamaha propellers: Boat Type, Available Props. The boat is a semi displacement which give me hope of improving on your correct calc of 5.4 knots for a displacement boat. My understanding is that you should always try to get prop to match Max rpm as close as possible to get the most power from motor, so the 14X11 should get me there.
Given the engine guidelines would be to run motor at generally 90% of top rpm i.e 3240 with occassional bursts of WOT, I think 14X11 might suit best. Many thanks for that, you are right the 2.21 gear reduction will deliver 1629rpm at shaft not 1689, typo by me. Again my goal is improved speed for cruising as my fishing grounds are a good hour out in the bay so want to get there as fast as possible. I really want to get the optimium prop for the boat and don't want to have to buy a third prop. My instincts tell me that a 14X11 should probably best deal with reducing the 4000rpm to close to 3600rpm on the basis of 1 extra inch in Dia should reduce rpm by about 150rpm and 1 inch increase pitch should reduce rpm by a further 200rpm totalling in bringing 4000rpm down to about 3650 rpm closest to recommended rpm?Īnyone got advice on this ? Are my assumptions on relationship of increasing D and P correct ie 150rpm and 200rpm respectively. My goal is not to achieve better acceleration but is to achieve the best crusing speed I can get at about 3300=3400 rpm, hopefully 8.5-9.5 knots. Having run the boat a WOT I am actually getting too many rmp, 4000 rpm which gives me about 7 knots. I sought a lot of advice from various prop shops and on line and I bought a 13X10 prop after the guy I bought it from convinced me this was optium, unfortunately it's not. I needed to change prop as previous prop was anti clockwise as old engine was a Volvo. Displacement is 1900KGs fully loaded, waterline is 16ft. Max rpm is 3600rpm at the crank and 1689rpm at shaft. Mercury Black Max propellers are made with Mercurys unique patented Mercalloy aluminum. These propellers are a great choice for engines less than 250 HP with top speeds less than 50 MPH/80 KPH. We’re here from 9:00 AM until 6:00 PM, EST, Monday through Friday at (877) 388-2628.I recently installed a new inboard diesel engine 3YM20 21hp yanmar on my boat. Mercury Black Max Propellers are well-balanced aluminum props. If you cannot locate what you need, give us a call. Make us your one-stop boating shop for every nautical requirement. When replacing or upgrading, know that Wholesale Marine carries a wide assortment of Yamaha propellers. Gear Ratio - Be sure to consider a propeller that allows the engine to operate within the manufacturer’s recommended Wide Open Throttle (WOT) RPM under normal conditions. If x 3 or x 4 is present, this means the number of propeller blades.īlades - These have cups (pertains to the lip on the blade tip), geometry (the actual blade shape) and surface area (the greater the blade area, the more water it pushes).
Example: 14” x 17” propeller has a 14” diameter and 17” of pitch. Size - This is expressed by diameter and pitch.
Low rake propellers cause less engine strain. High rake propellers are preferred for high engine mounts. Rake - The blade angle in relation to the propeller barrel/center. A low pitch provides greater acceleration and a higher pitch has a greater potential for higher speeds.
#14X11 INBOARD PROPELLER FULL#
Pitch - This is the distance a propeller travels in one full revolution. Here’s some additional advice and considerations you’ll find helpful when selecting a spare or replacement Yamaha propeller. You can use our parts finder, or give us a call and together we’ll locate the best choice for your boating needs. If you are not certain which replacement propeller is right for your craft, there are several ways to find out.
Replacement 4-blade sterndrive propellers for your Yamaha are also available. We carry spare and replacement propellers for Yamaha outboards from 2-20 HP, 25-50 HP, 55-100 Hp, 105-150 HP and over 150 HP. Wholesale Marine recommends that boaters keep a spare propeller on board. Michigan Wheel’s XHS exchangeable hub system ensures a secure fit and optimal performance. We stock replacement aluminum Yamaha propellers by Michigan Wheel that feature high-performance blade geometry and blades that have been precision-balanced and powder-coated to resist corrosion. When the propeller on your Yamaha outboard or sterndrive requires replacement, turn to Wholesale Marine.
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