Tom
Have you checked out the solar boat races the universities have each year?
The RC motors need better (bigger) bearing, stouter housings and water cooling for long run times.
They are generally wound with a view to higher amp peaks and average levels over a short time, the Io's are high, so the low amp efficiency tends to be poor, but there are exceptions.
The solar boat use large airplane props and APC props should be good in that role as they are designed by a fellow whose background was the development of submarine props.
If you like I can help you find a motor with high levels of efficiency at the amps you want to run at.
Could you tell me what you have been running at - voltage/chemistry, motor and kv, and prop.
The lipo are definitely a weight saver and the lower rate cells are much cheaper and totally adequate for lower current draws. Especially well suited to a high voltage low amp setups. There are some good marine RC controllers now which run to 16 and 20S lipo. They need buffering with caps (cheap) and the cooling maintained but should be very reliable in a low amp setup with a 100% duty cycle.
regards Andrew Gilchrist
www.fastelectrics.com
On 02/06/2012 5:43 AM, tom_the_rower wrote:
I believe that it is a special class 6c. and that you have to keep all your electric with you the whole race, no jettisoning it if it fails, and no charging from shore or generator, only solar, and the normal rules still apply, such as you must drag your boat down to the water from the high tide sand line, unassisted, plus a bunch of pain in the butt stuff, like you have to have a PLB (personal locator beacon, kind of like a epirb) plus a spot tracker with subscription and camping gear and hypothermia gear. Hopefully, I will be a quadruple threat, rowing, sail, electric and a parafoil sled kite. Just got to rig it up so that the electric will last the full 100 miles.
Tom
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