StormUK I have an almost identical situation as yourself. I have only recently started testing out my trolling motor but the results should give...
That is an interesting hull shape, not what I would have expected from a sailboat. It looks very much like a semi-displacement hull with those...
I finally got around to making the video on propeller performance. It is still just a high level explanation without detailed equations. The...
Can you elaborate on the area distribution? Aside from designing to avoid cavitation, how does a change in fluid properties change the optimum...
Did you use blade foil sections designed specifically for low Rn? I have been using rc aircraft props for my solar kayak. I found a very useful...
For my calculation purposes, I would like to evaluate performance at Rn of 200k-500k. I realise that at low Rn values there is an increase in...
It all came together today. 6kts! Still lots of issues to address, leaking gear-case, vibrating drive shaft. At least the concept has now proven...
More tests and more tests, always varying some variable until a pattern starts to emerge. For reasons yet unknown to me, there is a marked...
You would think that some supercaps will provide enough of a reference voltage for the MPPT to use. The MPPT supplier did mention that the Victron...
Supercaps! That is what's next! I think I have figured out why the little buck failed. Yesterday I had the motor back on the test bench with the...
A few days before the race I also tested the original brushed motor with the small 50W panels and a buck converter. It was partly cloudy which...
That is exactly what I did with my new motor. I used helical bevel gears from a small angle-grinder. The puller configuration greatly simplified...
Video of the dyno as discussed above. Also shown are the bevel gears from a small angle grinder. These will be used to reduce speed and increase...
Testing continues, this time with the batteries in series for 26V. The pinion in the generator gearbox eventually failed under the increased rpm....
Gonzo your comments have become a nuisance, I have patiently explained my approach and have been able to back up everything with actual...
Here are some propeller torque curves generated from propeller theory. A 12" x 6" and 12" x 10", each at static (think bollard pull) and at...
What I meant with "no restriction on available power" was power input available to the motor. At a fixed voltage this translates into current not...
Pick up a brushed motor and spin it with your fingers. I have one here and I can hardly feel the difference in torque between open and shorted...
No, motors stall because they do not have enough torque to overcome a load with a finite static torque. A motor operating at its maximum power can...
Results so far for 13V. I have added the shorted generator load using a torque estimate that would yield 50% efficiency. It gives a better...
