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Will this boat do 90mph???

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Old 09-13-2003, 11:58 AM
  #21
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You would have to be turning those engines close to 6500 to reach 90 with 25's
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Old 09-13-2003, 03:02 PM
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FYI -- The size of the pitot inlet really has nothing whatsoever to do with the #'s/sq. in. of water pressure that the speedo gage measures. Then the dial on your gage is calibrated in MPH rather than #'s. --- Jer
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Old 09-14-2003, 05:18 AM
  #23
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Assuming these factors here are the speeds it's capable of;

At 5000 RPM
1.36 gear and 25 pitch prop
at 7% prop slip = 80 mph
at 12 % prop slip = 76 mph
1.5 gear and a 25 pitch prop
at 7% prop slip = 73 mph
at 12% prop slip = 69 mph

At 5500 RPM
1.36 gear and 25 pitch prop
at 7% prop slip = 89 mph
at 12% prop slip = 84 mph
1.5 gear and 25 pitch prop
at 7 % prop slip = 80 mph
at 12% prop slip = 76 mph

At 6000 RPM
1.36 gear and 25 pitch prop
at 7% prop slip = 97 mph
at 12% prop slip = 91 mph
1.5 gear and 25 pitch prop
at 7% prop slip = 88 mph
at 12% prop slip = 83 mph

It's possible but not probable. Need more HP IMHO

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Old 09-14-2003, 08:03 PM
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jp's kind of on the right track - Speedo pitot diameter has no effect on the line pressure to the speedo head.

Big hole, little hole - the only reason the pitot hole isn't larger is that it would slow the boat down.

That is why you can use any brand of pitot and get the same result. I've seen hole diams from 1/16" to 3/16".

You gotta remember that the water in the line isn't moving at a steady speed. It is not a flow consideration, just a route for sampling of water pressure at speed.

With that said, NO, I don't believe this boat will go 100. Or 90. Or 80.
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Old 09-14-2003, 08:08 PM
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Talks up all the money in the motors and then there is not even a picture of them (High Priced Things)

NO
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Old 09-14-2003, 09:17 PM
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Friend of mine just sold his 311 with 625 Sterlings. Boat went 82 on a GOOD day. And these were Sterlings. He dosn't say who built his. My guess is NOT EVEN CLOSE!!
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Old 09-14-2003, 09:18 PM
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Default Re: Why Not !

Quote:
Originally posted by WickedWon
Faria gauges RULE !!!
Hey... I have Faria gauges. 'Course my boat is slow and rattly.
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