Sunday, July 26, 2009

Re: [Electric Boats] Torqeedo Cruise 2.0 vs 4.0 questions

 

The torque curve will tell more than the no-load speed. It's doubtful the controller would include either closed loop or rpm limitation, but a quick test with the prop out of the water will tell. If the speed is governed, there will be a slight variation in sound as the motor is reved at no-load.
Brushless DC motors typically develop their peak output at 70% to 90% of their no-load speed Operation in these regions should be reserved for peak loading, as the battery life is far important than getting an extra 0.5 knots by doubling the current at 70% of hull speed.

Be Well,
Arby

On Jul 26, 2009, at 4:20 PM, "dennis wolfe" <dwolfe@dropsheet.com> wrote:

I imagine the 1250 rpm is at no load and limited by the controller. The 48v model would turn the prop a lot faster under load on an actual boat in the water.

Denny

----- Original Message -----
From: ravlegend
To: electricboats@yahoogroups.com
Sent: Sunday, July 26, 2009 2:24 AM
Subject: [Electric Boats] Torqeedo Cruise 2.0 vs 4.0 questions

Could someone enlighten me on where the Torqeedo Cruise 4.0 gets it's extra "horsepower" from over the Cruise 2.0 model?

Both use 12X10 propeller.
Both put out 1250rpm max.

What variables am I missing?

http://www.yachtproductsintl.com/custom.aspx?id=15

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