It is called hull-speed or displacement-speed.
hull speed in knots = 1.34 times the square-root of the waterline length
then there is the prismatic coefficient where fat equals worse and narrow equals a bit better and really skinny can break the rules.
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The power requirements are a sharp curve.It will take at least 3 times the power to go from two-thirds hull speed to full hull speed.
But go ahead and build it, it will be an interesting project.
From: Paul Phillips
Sent: Monday, September 12, 2011 10:58 PM
Subject: Re: [Electric Boats] 1000w per ton?
ok, that is why I am asking. I am looking at 5-6' wheels not 8'. why 4x20 and not 4x8 or 10.
Paul
From: Ed Bachmann edbz <edbz@hotmail.com>
To: electricboats@yahoogroups.com
Sent: Monday, September 12, 2011 10:45 PM
Subject: Re: [Electric Boats] 1000w per ton?
To: electricboats@yahoogroups.com
Sent: Monday, September 12, 2011 10:45 PM
Subject: Re: [Electric Boats] 1000w per ton?
Open, flat paddles are not efficient (losses pushing he water down and up along with wash around the edges). Making them 8 feet in diameter seems way out of line.
And your hull shape is not going to help. My wild guess is you might get 2 knots. Change the design to 4 feet by 20 feet and you might see that 4 knot speed.
From: Paul Phillips
Sent: Monday, September 12, 2011 10:09 PM
Subject: Re: [Electric Boats] 1000w per ton?
looking at 4x8 to 6 x 12 flat bottom with 45degre bow. I belive the wheels are more efficent than a prop with less slip in the water. I am thinking 6-8 12x12 paddels on 2-6' wheels.
thanks
Paul
From: Ed Bachmann edbz <edbz@hotmail.com>
To: electricboats@yahoogroups.com
Sent: Monday, September 12, 2011 9:46 PM
Subject: Re: [Electric Boats] 1000w per ton?
To: electricboats@yahoogroups.com
Sent: Monday, September 12, 2011 9:46 PM
Subject: Re: [Electric Boats] 1000w per ton?
How small is your "small side-wheeler" going to be? Length, width, displacement, Style (shape) of hull?
Displacement speed limitations are going to be the issue but the dynamics of a side-wheeler are going to be too complicated for anyone to predict the actual speed.
Hi all
I noticed a post earler that referd to a rule of thum "1000W per ton" does this aply to pattel wheelers to? I am thinking about building a SMALL 1 or 2 person side wheeler with 2 eletric wheel chair moters (500W each) and the gear boxes that are atached. Then reduce down with a 3-1 belt reduction.this will give me about 4-5 knots with a 5-6' wheel. I have the speed controll and the joy stick to controll it. Any input?
Paul
I noticed a post earler that referd to a rule of thum "1000W per ton" does this aply to pattel wheelers to? I am thinking about building a SMALL 1 or 2 person side wheeler with 2 eletric wheel chair moters (500W each) and the gear boxes that are atached. Then reduce down with a 3-1 belt reduction.this will give me about 4-5 knots with a 5-6' wheel. I have the speed controll and the joy stick to controll it. Any input?
Paul
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