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post #171 of 187 Old 12-12-2009
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The Pardeys have and 8hp and you can read about there ethanol fuel issue right on this page

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If a dirty bottom slows you down what do you think it does to your boat
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post #172 of 187 Old 12-12-2009
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Thanks Tom. Except, I hate to sound dense (I feel a little like the dog when someone is pointing to the stick - go get the stick - looking at the finger instead of the stick) but you mean someplace in this thread? If not then I don't see it... if so, I'll plow back through and find it, that part I can handle.
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post #173 of 187 Old 12-12-2009
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And its fairly sad that your better facts seem to be whose the real sailor rather than even post pictures of some of your working real world installs

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If a dirty bottom slows you down what do you think it does to your boat
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Last edited by tommays; 12-12-2009 at 11:18 AM.
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post #174 of 187 Old 12-12-2009
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Just curious...

Do any of the current electric motor products use the prop to generate power? I remember seeing a wind generator (don't remember the brand) that you could replace the air rotor with a prop and lean the thing down into the water to generate power.

On the face of it, seems like it would be a good option to be recharging the bank while sailing using the prop itself. You could potentially get days of charging on a passage.

BTW - the build quality of that E-pod was truly embarrassing.


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post #175 of 187 Old 12-12-2009
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Hardy folk like the Pardeys, the Hiscocks, Don Street, etc. etc. prove that it is still possible today. The key is that your boat must be set up to sail really well, especially upwind.

When you use people like the Pardeys to make your case for motor less sailing you have to keep up to date as there always great to learn from BUT did buy and outboard as a necessary evil



I can say with proven facts you need 4HP at the prop to move an 8000# boat and the big thing working against electric is the PROP as any off the shelf sailboat prop is a massive energy waster as a comprise to the drag when sailing




Torqeedo Electric Outboard is the ONLY company that has done the engineering work necessary to provide and efficient prop fro electric drive

You guys should be able to provide some pictures of you working electric drives drives rather than deflect with whose the real sailor

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post #176 of 187 Old 12-12-2009
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Tom - dude, you just leapfrogged me with the same post! Impressive. Somebody get JagsB over here. I smell a wormhole conspiracy.


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post #177 of 187 Old 12-12-2009
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Agreed the Torqeedo 4.0 seems about the right size for my application... to put in place of a 9.9 hp 4 stroke. But it ends up running about twice the cost of its gas equivalent, and still leaves me struggling to recharge on an extended trip.
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post #178 of 187 Old 12-12-2009
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Hi Mitiempo,

That's a beautiful place you live!

I used to have an Ericson 23 (also electric) but now have an Ericson 27.

I understand your concern about range with the summer trips you do , it's not a trivial issue. Also not insurmountable.

My boat had an Atomic 4 then a 6hp outboard.

I have a PakTrakr battery monitor. I find the SOC reading pretty useless as it is set for different max and empty states of charge than my batteries and the two banks are different from each-other. I watch the volts. After 7 hrs at a 20 amp draw I was just under 48 volts, maybe 47.9. I also had +/- 52 volts left in the second bank. I typically use very little current.

Top speed with a 12x10 fixed three (fat) blade prop is 5.8 knots (110 amps). You will eat up amps fast at that rate. 4 knots at 20 amps is what I use if I'm going to have to motor for a long time. I do take a hit on sailing speed with my current prop (1/2 knot?). I have a Campbell Sailor (skinny blades) that I want to try but it is right handed instead of left handed and I need the left handed prop walk to get out of my slip :-). To switch from right to left handed props I have a patch plug that switches the + and - on the low voltage forward/reverse switch (my transmission).

I've got about $6000 into my electric auxiliary.
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post #179 of 187 Old 12-12-2009
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post #180 of 187 Old 12-12-2009
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Mark
Just watched the video. It's impressive. $6000 is pretty affordable. If I were to do this I could see a few improvements though. One is combining all batteries in one bank as that gives you more usable amps especially with the large amp use of an electric drive. I'd put a real battery monitor on so I'd know the amps in and out accurately as voltage can't give accuracy until the bank is rested quite a while. The extra life of the batteries will easily more than pay for the monitor which would only cost about $250.
Why do you need a left handed prop to get out of your slip? The Campbell Sailor backs better than most 3 blades and I doubt you'd have a problem - especially with all that torque. What I don't really buy is the power regenerated under sail. The numbers in the video are 200 watts at 6 knots - at what voltage? If it is 48 volts that's only 4 amps. There's just no way to regenerate enough as far as I can tell.

Brian
Living aboard in Victoria Harbour
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