We have a 200 amp hour pack. The prop rpm is in that range you mentioned at 3.to 3.5 kts about 4.5 hours to 50%.
We can in flat water hit 5 kts but no for long.
Richard.
On Mar 8, 2019 9:39 AM, "tvinypsi@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
Thank you for the thoughts, Kevin. Much appreciated! I've seen at least one other boater's suggestion that the prop calculators are intended for ICE driven boats and not electric, although the Vic Prop calculator seems to be designed the goal of attaining as close to hull speed as the engine/motor seems able. The torque it assumes is the maximum as calculated for the user-entered horsepower. I don't think any by highest RPM attainable by the user-described system is considered in its calculation.
With this in mind, the problem with using the Vic Prop calculator is knowing what figure for HP should be entered. Thunderstruck states their 10Kw motor will generate up to 10HP continuously, but offers a peak of 28HP. What would be the correct figure to use? I haven't been able to figure it out.But then there's also the question of what ratio of reduction to use. A big wheel is most efficient, but if constrained in diameter, I've read, increase the RPM or increase the pitch at the expense of efficiency.Not being an engineer of any kind, it's all quite a lot to get my head around!On the prop size/kort nozzle concepts ... My prop diameter is constrained by being in the aperture of a full-keel boat. In my readings I have indeed run across kort nozzles and thought about the possibility of such a retrofit. We're in the Great Lakes, so beyond the material and structural design questions that I'm not entirely competent to answer, the potential for fouling is a serious consideration. A couple of different types of mussels are particularly pesky. So, I doubt I'll attempt this. Great suggestion though .. sort of like an aft-facing bow thruster!
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Posted by: Richard <fullkeel2000@yahoo.ca>
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