Re: what the difference. cobra outdrives
True, factories would never do something as irrational as that. However, theoretically if the drive is spinning slower all you have to do is put a more aggressively pitched blade on the end of that spinning shaft to make up the difference. The problem is that you get into hydrodynamic issues with how efficiently the larger prop moves through the water. Airplanes use similar principles, a jet uses a very small blade spinning at very high speeds to move quickly while helicopters use huge blades moving slowly in order to lift heavy objects straight up in the air. Both have their advantages. A slower spinning prop on a boat that has a very high pitch angle may not give you a very good top speed but it would have plenty of torque. Think of a tug boat vs a hydroplane. Would this not work because they would not bolt up the same or do you think that the gearing in the 4 cylinder out drive would be too weak to handle the extra 60 or 70 hp? I mean the HP jump is not THAT significant. I'm not trying to make a perfect boat, just something that will run for a few summers with an out drive I can grab for 100 bucks.
