Profile

Name: AYRS Weymouth meeting on Speedsailing
Start: 2021-10-13T19:30:00+01:00
End: 2021-10-13T21:30:00+01:00
Location: Weymouth Sailing Club

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Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
[...]2.The batteries: there are for sure a lot of different batteries, all suitable to your project. Some are cheaper than other... I just want to mentioned that Caterpillar make a really good hybrid battery available worldwide and at an affordable price. It’s a regular 12V hybrid lead battery of 100 AH, group 31, maintenance free. […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Thank you Alex,I know about the comparatively large losses of the props. For this reason I try to go in the long term with a large and slow turning prop. I developed a software tool to calculate the shape of props - along the parameters given in the Dictionary of the International Towing Tank Conference […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Other few remarks...-I thing that knowing the real thrust out an electric motor is most important than anything else. This value has to be comparing to the residuary resistance of yours hull(s). Keep in mind, that the last link of the kinematic chain is the propeller. And let’s say that the maximum propeller efficiency you […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Thank you John,"... much depends on what kind of boating you want to do"I'll go slow and driving silently, That's the point for us to go electric and (partly) solar. 2014 and 2015 we were sailing a few days with roughly comparable electric boats we hired (but monohulls, 2 kW torqeedo outboard and the other […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Curiosity lead me to look up the specification for the Haswing 3.0 electric outboard motor that you mention. (https://www.boxmarine.co.uk/products/ha ... controller). One thing I noticed is that this is advertised as a 5hp motor, and the specification actually says that the shaft power is 5hp, but when you read the details it says that the […]