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Hull Speed
- g36
- Admiral
- Posts: 2002
- Joined: April 7th, 2014, 6:07 pm
- Vessel Info: 1997 Carver 405
- Location: Soddy Daisy TN.
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Re: Hull Speed
Crusader xli
The Black Pearl
Soddy Daisy Tn.
- Senorjeem
- Scurvy Dog
- Posts: 10
- Joined: June 5th, 2018, 5:37 am
- Vessel Info: 1997 350 Mariner
- Location: British Columbia Canada
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Re: Hull Speed
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- CYO Supporter
- Posts: 2307
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
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Re: Hull Speed
- km1125
- Admiral
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Re: Hull Speed
comes out to 42MPH hull speed!!!
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- CYO Supporter
- Posts: 2307
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X - Location: upper chesapeake bay
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Re: Hull Speed
- RGrew176
- Admiral
- Posts: 6388
- Joined: August 17th, 2015, 4:07 am
- Vessel Info: 2022 Stingray 182 SC
- Location: Southgate, MI.
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Re: Hull Speed
tomschauer wrote:Source of the post Rick, start slow and creep up the rpm, you have had your boat long enough that you should be able to "feel" when it starts to squat and plow water. When that happens, back off a bit till she is on top again, that would most likely be your most economical hull speed.
Great advice. I played with it a bit last year and I am thinking that my hull speed is somewhere between 1400 and 1600 RPM. I do need to spend some more time figuring that out.
2022 Stingray 182 SC
2004 Past Commodore
West River Yacht & Cruising Club
- bud37
- Admiral
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Re: Hull Speed
Senorjeem wrote:Source of the post I would have thought that there was more to this than simply entering your waterline length. Won't beam have a great influence here? Narrower the wedge that you are pushing through the water, the easier, and so the higher the hull speed for a given length???
Good point, there are much more complicated calculations for many different hull designs, but for our boat hulls that calculator posted seems to be pretty darn close, we have planing hulls and are trying to estimate hull speed in a displacement use, as has been said before the hull starts pushing water.
Rick , its amazing how that 1400-1600 rpm shows on different boats I have had......you can really see the tipping point with fuel flow meters on the engines.
- Ed Schumacher
- Scurvy Dog
- Posts: 2
- Joined: December 19th, 2018, 7:29 am
- Vessel Info: 1982 carver 3007 aft cabin
- Location: Nova Scotia, Canada
Re: Hull Speed
but sounds like your using a displacement hull model , planing hulls are a different beast . If your puddling along with your strern dragging half the harbour along with it your burning fuel
. I can drive a 33 foot sailboat under power at 6.5 knts and burn 1.5 litres an hr
because its a very efficiant displacement hull . Your Carver is going to burn less on plane because that's where it's designed to be. still going to burn fuel , its a big heavy boat and there's nothing much less efficient than a large planing power boat.
other than maybe an s71 blackbird or perhaps an M1 tank, cause someone thought a turbine engine was a good idea
to get away from the Russian hordes .
Besides they stuck twin 350s in my 3007 if I was supposed to puddle along at 6 knts, all I would have needed was two yanmar 15 hp diesels . And they could have put another bedroom down there.
- Ed Schumacher
- Scurvy Dog
- Posts: 2
- Joined: December 19th, 2018, 7:29 am
- Vessel Info: 1982 carver 3007 aft cabin
- Location: Nova Scotia, Canada
Re: Hull Speed
but sounds like your using a displacement hull model , planing hulls are a different beast . If your puddling along with your strern dragging half the harbour along with it your burning fuel
. I can drive a 33 foot sailboat under power at 6.5 knts and burn 1.5 litres an hr
because its a very efficiant displacement hull . Your Carver is going to burn less on plane because that's where it's designed to be. still going to burn fuel , its a big heavy boat and there's nothing much less efficient than a large planing power boat.
other than maybe an s71 blackbird or perhaps an M1 tank, cause someone thought a turbine engine was a good idea
to get away from the Russian hordes .
Besides they stuck twin 350s in my 3007 if I was supposed to puddle along at 6 knts, all I would have needed was two yanmar 15 hp diesels . And they could have put another bedroom down there.
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