Andy,
Another application is maybe for dinghy motors. I realize torquedo is already there, but I don't think that theirs will push a 12 foot rigid inflatable up on a plane for any appreciable length of time. With all the ethanol problems in the smaller motors, I for one would like to skip all that and go electric. For example, I have a property on an island that I use four times/year. To get to town it is about a 1.5 mile dinghy ride. So range is not that big a deal, although more would be nice. The big thing is that since the motor only gets used when I'm on the island, unless I'm very diligent about laying it up properly between trips I'm bound to have a problem.
Thanks,
Jerry Barth
Sent from Mail for Windows 10
From: mike@electricyachtssocal.com [electricboats]
Sent: Tuesday, November 3, 2015 9:08 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: New member, developing electric outboard
Andy,
Excited about what you are building. My advice? If you are going to use the boat as a test/demonstration boat, you should get a boat that is more common in the market and would provide the most representative model for the market. If you are looking at 20kW outboard, I would want to know how it pushes a 13ft Boston Whaler which is a well know and popular boat which is often powered by motors from 9.9hp to 40hp. That would be a great demo boat to use in order for the market understand the capabilities of the motor.
I also want to understand the 20kW continuous. Does it have a higher rating for short bursts? What is the voltage of the motor? The 1500 RPM is good. The special propeller also is of interest. We know of other electric outboards that over compare their capabilities because in a controlled test their special propeller will perform better than what would be a real world usage.
Outboards are rated at the propeller (thrust) which is vastly different than what inboards are rated. A 35 hp diesel (break hp) is actually about 28shp (shaft hp). That is what we all expect. My question is will your 20kW electric outboard therefore would likely be more comparable to a 28hp outboard (20000w / 746). Very impressive and I believe there is a market for such a quiet powerful motor. I would also think that a motor that would provide the thrust of a 9.9hp outboard would be even more popular.
Mike Electric Yachts of Southern California/Pacific
Posted by: Jerry Barth <Shredderf16@sbcglobal.net>
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