depends on length/width/hull ype/and total normal weight load but heres and example 75 16 ft. sangstercraft /deep v hull weighing about 1800 pounds total incl. motor gear etc. i use a 12pitch prop it does 46 k/hr at mid trim and 51 k/hr at max trim ( roughly 22-26mph) if you are heavier or longer you will want an 11 or even a 10 pitch . best advice though is have tachometer installed so you can verify you are turning max rpm's at w.o.t . a motor running at its full potential will be healthier than one running outside that range usually 5000 - 5500 rpm
depends on length/width/hull ype/and total normal weight load but heres and example 75 16 ft. sangstercraft /deep v hull weighing about 1800 pounds total incl. motor gear etc. i use a 12pitch prop it does 46 k/hr at mid trim and 51 k/hr at max trim ( roughly 22-26mph) if you are heavier or longer you will want an 11 or even a 10 pitch . best advice though is have tachometer installed so you can verify you are turning max rpm's at w.o.t . a motor running at its full potential will be healthier than one running outside that range usually 5000 - 5500 rpm
right behind the prop, on the same shaft
$1000
A 4 hp Mercury outboard, produces a true 4 hp, rated at the prop.
yes mercury made a 260hp engine. it is a 2.5 ltr v6 2 stroke, the early carby models made 245hp, then went efi which made 260hp at the prop, 7500rpm redline. then they bought out the same block with different porting and electrics around 1999ish. this engine made 280hp @ the prop. these engine are race engines. not your normal fishing outboard
I have a 19' Crestline with a Mercury 50 ELPTO that has a 12X101/2 Turningpoint prop. Max speed with (2) aboard is 23 MPH by GPS @ 5600 RPM in ideal conditions. I crusie at 4000 RPM at about 13.5 MPH burning 2.5 gallons per hour. Max speed drops to 20 MPH with (5) aboard and will crusie at 12.5 MPH at 4000.
The 9.9 hp Mercury outboard requires a special flusher, and removal of the propeller is suggested for ease of installation. You can use a regular flusher if you position it just right, (the water pick-up is located underneath the anti-ventilation plate, above the prop), but I find it easier to use a barrel or waste can.
401.2 without prop
It's good to repair it as it protects your lower unit and prop. However it won't affect handling. It is not a rudder, it is a prop protector.
Replace the shear pin.
change the prop pitch nah done that. its to do with the engine.
398lbs +prop and oil,gear lube 446lbs
The propeller size on an outboard engine, is dependant on the application. The size of the boat, and more particularly the weight it will carry, determines the propeller size.