prop recommendation for 16' Cruiser with Suzuki 50

D

DMcD

New member
prop recommendation for 16' Cruiser with Suzuki 50?

motor manual has the following table (all 3 bladed):

11.5 x 9
11.5 x 10
11.5 x 11
11.5 x 9
11.625 x 12
11.5 x 13
11.375 x 14
11.25 x 15
11.125 x 16
11 x 17

thanks for any suggestions
DMcD
 
To best determine the prop for any outboard, one should know the engine RPM at wide open throttle, as well as the GPS measured speed, in calm, no current water. The engine should reach at least 5500 RPM--better 6,000 RPM. The boats are loaded differently, The positing of the motor on the transom (too deep or too shallow) will make a difference; also trim to get the maximum RPM/speed with the prop you have now. SS props will require slightly less pitch (or give slightly more speed for the same size, because of flex of the aluminum props. For this reason I avoid the plastic props--although some like the replaceable blades.
 
thanks for info. The reason I want a new propeller is that the old one has some damage on tip/edge from rubbing against a faulty prop-guard/shroud. Won't that worn/flattened edge affect the RPM at wide open throttle?

I wish I had done the research and recorded the RPM at WOT with the propeller in its original state.
 
Having a propgruard/ shield may also affect speed/RPM...And if you run with it all of the time,could be an important factor.

Although the damage may cause a little error, the prop should still be close, especially if you fine down any burns on the edges.
 
Read the original prop's data [pitch and diameter]. Thats your starting point . Thats a particularly high revving motor . 6500 RPM redline .
6000 or better for best performance and longevity.
Marc
 
I cannot find markings of any kind to identify which prop is currently on my motor. Does anyone know what would be the factory default for a Suzuki DF50? I'd just as soon replace it with the default.

Also, I did attempt to record the RPM at WOT. Note: the propeller has a little roll over on the tip edge that I have not attempted to file off where it rubbed on the prop guard shroud which is no longer installed. Unfortunately it was a little too choppy to get in a good test... got up to about 5600 RPM and it was still inching up when we became uncomfortable with the ride. The manual says ideal range is 5900-6500 RPM for this motor.
 
I do carry a file with me to touch up any dings. I would file down the edges, The 5600 is fine--and you are probably proper propped. However, a dinged prop should be rebuilt or replaced not good for the lower unit to run out of balance for any long time.

The number may be in the are on the back of the prop hub. Either between the blades on the hub, or pull the prop (need to do that for lube yearly anyway) Look on the back of the hub, there should be either a part # or 11.25 x 15 etc..
 
Back
Top