Re: [electricboats] Re Power for SV/Retreat Time Catamaran

 

I have a 34’, 13500 lb keel/centerboard cat/ketch with a Thunderstruck 12kw watercooled kit. Prop is 17” x 13” fixed 2 blade. I am using the “large” Thunderstruck 2.5-1 gear reduction which is chain rather than belt. Initially the boat was over-propped and the current draw overwhelmed the C rating of the bank. I bought 10’ of SS #50 roller chain, 3 different size motor sprockets and a chain breaker all for  $200. Changing the reduction ratio takes less than 1 hour and I do not have to haul the boat. Things are working much better now at 3.33-1. Interesting how good regen worked when it was over-propped. 

i am using a 3kw aircooled quiet generator on propane to reduce my range anxiety. I have it mounted in a cockpit locker with 2 x 3” 12 volt blowers evacuating the locker and a water jacketed extension exhausting out the transom. Temps in the locker are 110 degrees max. Generator can keep up with the load at 4 knots.

 

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