Efficiency is better with a three blade but the amp draw is going to be the same for work performed. I am a pilot and we use this in our variable speed props. You tie to a tree and your prop just slips in the water it does not use much in the way of amps. I am also a pump installer. You would think that as the pump build pressure it would take more amps, but this is not the case. The higher the pressure the less water being pumped, the less amps needed. The highest amps used is when you are pumping the most water.
On Thu, Aug 30, 2018 at 2:51 PM, Hannu Venermo gcode.fi@gmail.com [electricboats]<electricboats@yahoogroups.com> wrote:Excellent post.
Sort of agree on many of your points.
Sort of disagree on some.
If we tie a rope to a tree on shore and pull the boat - vs using the
propellers, we get 4-5x better performance in power/pull/cost.
So propellers are about 20% efficient at best - in general.
The best recovered lion battery modules cost about the same as fla/agm
per usable capacity.
Efficiency is easily seen.
I can push/pull a 70 metric tons 24 m steel powerboat at around 0.5 knots.
My power == 100 W (more like 40W).
Any prop system will consume many multiple of 100W to deliver 0.6 knots.
On 30/08/2018 16:13, king_of_neworleans wrote:
> Stick around and read the threads going back over the years. Do your
> homework. It will take you at least a year or two to reach the point
> where you can DIY your electric propulsion setup with a reasonable
> chance of success.
--
-hanermo (cnc designs)
Posted by: Daniel Michaels <nov32394@yahoo.com>
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