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Forum: General Boating Discussion 04-03-2007, 09:35 PM
Replies: 55
Views: 6,664
Posted By Jon Fuller
Without any slip at all, the sums say 80.66mph,...

Without any slip at all, the sums say 80.66mph, so nearly 88mph would be a bit of a miracle, a 7mph miracle. I think that if the RPMs, and pitch are correct, sterling is right on the money at 73mph,...
Forum: General Boating Discussion 04-03-2007, 09:05 PM
Replies: 55
Views: 6,664
Posted By Jon Fuller
6000 (rpm) divide by 1.62:1 = 3703 x 23 ("pitch)...

6000 (rpm) divide by 1.62:1 = 3703 x 23 ("pitch) = 85185 divide by 1056 (magic number) = 80.66 (mph before slip) x 0.9 (10% slip factor) = 72.6mph (actual speed, assuming pitch and tachometer are...
Forum: General Boating Discussion 28-02-2007, 10:04 AM
Replies: 55
Views: 6,664
Posted By Jon Fuller
A very precise figure! How did you measure it?

A very precise figure! How did you measure it?
Forum: General Boating Discussion 28-02-2007, 09:57 AM
Replies: 55
Views: 6,664
Posted By Jon Fuller
That seems quick! I know a regular 21 will run...

That seems quick! I know a regular 21 will run low 80's with a stock 2.5/260, but would assume that'd be a lighter motor than the XS.
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