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Myles Thanks for the explanation. But which would be more efficient, turning the motor faster or slower with more resistance? Glenn

Myles, your numbers look good. I have noticed that most prop manufacturers use a 50-55% "slip" factor in determining the proper pitch for displacement auxilliary sailboats, so your 65-70% prop

Thanks Myles, it is in prop efficiency, next the mechanical drag, and then current control.. I've been working on the first thing, prop efficiency.. Dave K ________________________________ To:

OOPS.I meant to say: Since the power is proportional to the speed cubed, the prop driving 10knots of current will transfer substantially MORE power than if it is "driven" by the water with the 5knots

Probably the best you could do is get the same prop and conversion efficiency as your system does in delivering electrical energy into boat kinetic energy. So if you happen to have a damn good prop

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All I was disappointed to learn that regen would not "completely solve all problems" ;-) But as I read the last post I wondered, has anyone tried a different ratio for regen sort of a two speed

That's the same number that we use here because it is a basic scientific conversion. Gasoline holds 33.7kWh (115,000 Btu) per gallon and deisel holds 38.2kWh (130,500 Btu) per gallon. The numbers

The problem with all the data being published about the "new" electric cars is putting it into meaningful context. For instance, the statement that 1 gal gas is the energy equivalent of 34 KWh is

Eric, Thanks for adding this clear explanation concerning regen. I've found the people who are asking us about regen under sail seem to think of this as "free power" and that it will solve all of

EPA calculated the Leaf's fuel economy based on a formula that says 33.7 kilowatts per hour holds the energy equivalent of one gallon of gasoline. The label estimates a charging time of 7 hours on a

Thanks, I promise I'll do my homework first and after sailing her silly I'll had the weight and see how she sails. I think even moving the weight around to different areas might help. I'm a

You could try just adding the weight of the batteries first before taking the plunge Richard.

Ron,?Real engineers think, then if they are lucky, they can put things together...haha ?and if they are really lucky they have the money to make a few things happen.. ?We continue to build, if we

Eric, ?I do know what you are talking about poundage wise and I plan on sailing myself silly just the way she is before making any significant changes... ?I've got an 8 hp Johnson 2 stroke right now

Thanks Dave, I would love to be part of a "session" but not being a real engineer, I tend to clear a room pretty quick :) I have many ideas, but not being smart enough to prove they would work, I have

I couldn't find any specs for a Stiletto 26 but the 27's range from 1100 pounds for the base model to the 27SE at 1550 pounds. Coming from a mono, you probably won't mind sacrificing the 22kt top

Eric, I understand were your coming from on the electric drive for your Tri and not wanting the weight of the batteries. Something that the multi hullers should also consider is the fact that the

I have 36' steel sailboat so unless batteries get better and cheeper I will be using a 5 to 10 kw generator. ________________________________ To: electricboats@... Sent: Mon, November

Check out Triton called "Atom" he made some stands so that you can stand it up on the beach at low tide. Really cool. Triton has the same draft as the Alberg 30. Dan