I have a 2011 Yamaha F70 mounted on an aluminum hull Buster Lx and was wondering what would be the best prop to get the most top speed out of the combination.
I currently have an aluminum Yamaha 13 1/4 x 17 K prop.
I get 6300 rpm and 32.7 kts / 37.6 mph WOT fully trimmed up when I'm the only person in the boat. The motor is currently mounted as high as possible and the anti-ventilation plate is just above the water.
The engine has recommended WOT range of 5300-6300 rpm. The gear ratio is 2.33:1.
The boat:
Length:
5.04m / 16.5 ft
Beam:
1.98m / 6.5 ft
Weight:
415kg / 915 lbs
Hull V-angle:
16 degrees
Number of persons:
6
Power range:
40-60hp
Performance:
The boat is basically made out of a Buster L by moving the driver and passenger forward and giving them individual seats. The Buster L:
Since the boat is a bit nose heavy I have to trim it as high as possible to get the bow up. This increases the speed but I'm not sure if the current prop is the optimum choice getting the bow up and running this close to the surface at this angle. I believe the prop slips quite a bit when I trim it all the way up. It rises quite a fountain behind the boat:
What do you guys think what would be the best prop to get the most out of the combination?
I currently have an aluminum Yamaha 13 1/4 x 17 K prop.
I get 6300 rpm and 32.7 kts / 37.6 mph WOT fully trimmed up when I'm the only person in the boat. The motor is currently mounted as high as possible and the anti-ventilation plate is just above the water.
The engine has recommended WOT range of 5300-6300 rpm. The gear ratio is 2.33:1.
The boat:

Length:
5.04m / 16.5 ft
Beam:
1.98m / 6.5 ft
Weight:
415kg / 915 lbs
Hull V-angle:
16 degrees
Number of persons:
6
Power range:
40-60hp
Performance:

The boat is basically made out of a Buster L by moving the driver and passenger forward and giving them individual seats. The Buster L:

Since the boat is a bit nose heavy I have to trim it as high as possible to get the bow up. This increases the speed but I'm not sure if the current prop is the optimum choice getting the bow up and running this close to the surface at this angle. I believe the prop slips quite a bit when I trim it all the way up. It rises quite a fountain behind the boat:

What do you guys think what would be the best prop to get the most out of the combination?
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