What if we ran these boats for 100 miles?
Who would get there first?


"Shortwave Sportfishing" wrote in message
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On Sun, 26 Feb 2006 16:35:18 -0500, "RCE" wrote:


"Shortwave Sportfishing" wrote in message
news
On Sun, 26 Feb 2006 16:04:43 -0500, "RCE" wrote:



I don't disagree with anything that's been said so far - everybody has
made great points. But I'm firmly in the camp of horsepower vs rpm.

With less horsepower, all else being equal, it makes sense to me that
the engine will transmit less direct power to the prop, thus more
slippage, thus less speed.

Well, this is fine how-do-you-do! We disagree.

The magic part of this exercise is the 6000 RPM. Again, all else equal,
including prop pitch, both boats are going to move the same distance in
the
same time.

The bigger engine will get to 6000 RPM faster ... and *it* will probably
produce more prop slip in the process. Not unlike burning rubber in your
Vette. Get fatter or sticky-er tires and your slippage will decrease.

Again, I'm not disagreeing with anything that's been said as it all
makes sense to me.

But, just as a discussion exercise...

Everybody is forgetting how we got to 6,000 RPM. All else being
equal, more horsepower will get you to 6000 RPM faster with the net
result being more end speed at 6000 RPM. Once the boat is planing and
the boat is approaching 6000 RPM horsepower beings to show up
resulting in a higher end speed.

Yes/No?