Here is another set of numbers. These are from a tow-test I did today, and show boat speed in knots vs. drag in pounds. My setup was a little crude so I didn't get real clean readings.
Speed Drag
3.0 40.0
3.4 39.4
3.4 36.0
4.0 60.0
4.5 122.0
4.9 138.0
5.0 128.0
5.6 186.0
5.8 190.0
6.1 179.8
To those who asked about my reduction ratio, I didn't count the teeth, but it's real close to 2.2:1. Also, I posted another pic in the photo section showing my motor, controller, and battery installation. Since this is a test setup I haven't spent any time making things pretty.
Cheers,
Jim McMillan
--- In electricboats@yahoogroups.com, Steamboat Willie <stmbtwle@...> wrote:
>
> My sentiments exactly.. A tracking device on a boat that can turn 360 degrees and more involves slip rings and who knows whatever else. No doubt you CAN build one, but an extra panel to make up the difference might well be less expensive than the tracker and mount. I mounted mine flat, with no tracker. No moving parts, and no problems.
>
> Willie
>
> --- On Thu, 10/7/10, luv2bsailin <luv2bsailin@...> wrote:
>
> From: luv2bsailin <luv2bsailin@...>
> Subject: [Electric Boats] Re: Albin 25 test results
> To: electricboats@yahoogroups.com
> Date: Thursday, October 7, 2010, 8:42 PM
>
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> Â
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> Thanks Geoff.
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> In the interest of simplicity I am going to mount them flat on the roof for now. My feeling is that the increased output would have to be pretty significant to be worth the added complexity of a tracking mechanism on a moving boat.
>
> Jim
>
> PS. I started a picture album titled "Albin 25" in the photo section. Will add more pics as I get them.
>
>
>
> --- In electricboats@yahoogroups.com, geoff gamsby <geoffgamsby@> wrote:
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> >
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> > I have heard that it is also fairly easy to build a photo-sensor to
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> > track and turn the array to the brightest light source
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> > geoff
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> > www.straightturn.net
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> >
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