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Author Topic:   Effects of calm water on boat performance

aussiejake posted 09-20-2009 10:06 PM ET (US)
I have noted that on very calm days (no wind) but swell still rolling through that the boat tends to "stick" to the water. When there is a bit of wind chop the hull seems to perform better, possibly because air flows under the hull better?
My boat is a 21 degree half cabin with a weight of 1500kg. The motor is a 2006 Mercury 150hp EFI.
Its hard to explain but the engine still reaches top rpm but it seems to glue down into the water and lose top end on those calm windless days.
Is this a trait of deep V hulls or is it in my imagination.
cheers,
Jake
Tom W Clark posted 09-21-2009 12:47 AM ET (US)
It is not you imagination.
It is true of all hulls.
elaelap posted 09-21-2009 11:01 AM ET (US)
Of all planing hulls.
Tony
Buckda posted 09-21-2009 04:12 PM ET (US)
I have no idea why, but flat, greasy calm conditions often cause my Whaler to do aggressive "S-turns" and the occasional "power circle" at WOT. Sometimes it also causes the operator (me, if I'm driving) to whoop out loud and usually requires all aboard to brush the bugs out of their Whaler-wide grins when we get back to the dock.
Strange.
deepwater posted 09-22-2009 10:16 PM ET (US)
That's because you have a loose grip on reality and a need to feel the tears in yer ears like me ^@^ ,,hey max when ya coming up,,Back on subject,,yes the slick smooth water does grab and the very light chop wavy water lets the beast run free
R T M posted 09-23-2009 08:34 PM ET (US)
When, or if the conditions are the same, my 13 footer is 1 mph faster in salt water than in fresh water.
rich/Binkie
elaelap posted 09-24-2009 12:24 AM ET (US)
Water so calm and beautiful it would have almost been a crime to do anything but idle through it:
http://i22.photobucket.com/albums/b309/elaelap/LakeSonomareflections052. jpg
RobertRibley posted 09-24-2009 08:15 PM ET (US)
The same holds true for Ski performance.Water like Tony pic.one can Brake later and turn harder.With my outrage 18 and water like that 15 off at 31mph . And no one in the stern Fun fun fun Free sking.
RJG posted 09-24-2009 09:53 PM ET (US)
Tony
Is that your life jacket laying on the bow of the boat?
R T M posted 09-24-2009 11:12 PM ET (US)
I think at the time of this picture, Tony was running along just off plane. He is always one to make waves.;)

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Author	Topic: Effects of calm water on boat performance
aussiejake	posted 09-20-2009 10:06 PM ET (US) I have noted that on very calm days (no wind) but swell still rolling through that the boat tends to "stick" to the water. When there is a bit of wind chop the hull seems to perform better, possibly because air flows under the hull better? My boat is a 21 degree half cabin with a weight of 1500kg. The motor is a 2006 Mercury 150hp EFI. Its hard to explain but the engine still reaches top rpm but it seems to glue down into the water and lose top end on those calm windless days. Is this a trait of deep V hulls or is it in my imagination. cheers, Jake
Tom W Clark	posted 09-21-2009 12:47 AM ET (US) It is not you imagination. It is true of all hulls.
elaelap	posted 09-21-2009 11:01 AM ET (US) Of all planing hulls. Tony
Buckda	posted 09-21-2009 04:12 PM ET (US) I have no idea why, but flat, greasy calm conditions often cause my Whaler to do aggressive "S-turns" and the occasional "power circle" at WOT. Sometimes it also causes the operator (me, if I'm driving) to whoop out loud and usually requires all aboard to brush the bugs out of their Whaler-wide grins when we get back to the dock. Strange.
deepwater	posted 09-22-2009 10:16 PM ET (US) That's because you have a loose grip on reality and a need to feel the tears in yer ears like me ^@^ ,,hey max when ya coming up,,Back on subject,,yes the slick smooth water does grab and the very light chop wavy water lets the beast run free
R T M	posted 09-23-2009 08:34 PM ET (US) When, or if the conditions are the same, my 13 footer is 1 mph faster in salt water than in fresh water. rich/Binkie
elaelap	posted 09-24-2009 12:24 AM ET (US) Water so calm and beautiful it would have almost been a crime to do anything but idle through it: http://i22.photobucket.com/albums/b309/elaelap/LakeSonomareflections052. jpg
RobertRibley	posted 09-24-2009 08:15 PM ET (US) The same holds true for Ski performance.Water like Tony pic.one can Brake later and turn harder.With my outrage 18 and water like that 15 off at 31mph . And no one in the stern Fun fun fun Free sking.
RJG	posted 09-24-2009 09:53 PM ET (US) Tony Is that your life jacket laying on the bow of the boat?
R T M	posted 09-24-2009 11:12 PM ET (US) I think at the time of this picture, Tony was running along just off plane. He is always one to make waves.;)