开云体育

Retreat Time is a 2006 refit from diesel to electric however it is under powered having 2.2 kw PM brushless motors at 144v. Direct drive. They were re insulated, and upgraded to American motion control, controllers new in 2019, they operate perfectly and are for sale if anyone is interested.

She is 44 ft LOA Sail craft Apache catamaran about 40 ft at the water line, 19.5 beam, Displacement is 13000 lbs theoretically, I'm guessing the weight trade off for the 50 hp diesels for the 24 - 115 Amp hour AGM batteries is a wash. She drafts 3.5 and 2.8 without the part of the keel that goes below the propellers so it can sit on a sand bar. What I mean is from the rudders forward its like railroad rails make up the bottom of the keels that allow the you to sit flat on the bottom when the tide goes out.

Propellers, what I know is they are 15 in diameter three blade fixed, pitch is unknown.
Will the group help me determine if the Thunderstruck 18Kw kits with all the liquid cooling, controller and motors, with gear reduction @72v be suitable to maintain 5 knots or so depending on conditions?

Plan- Divide the 144v banks in each hull to duel 72v having one in use and a stand by ready to go, or charging from the Fischer Panda 9 kw 220v generator or re gen.?

Do you have power/speedRPM info from your diesel? This will help you predict correct reduction and propeller diameter. Your 72v motor will gave a top speed of 3,600RPM ?if, for instance, you had a cruising speed if 6 knits with a propeller speed of 900 RPM with existing prop, you can do the math to figure out reduction - somewhere around 4:1 in this instance.

My 40’ cat weighs over 20,000# and has a pair of Motenergy 48v/10kW motors using a 3:1 reduction with max prop RPM of 800. My max speed is 6.3kts with max cruise of 6 knots.?

my guess is you’ll find you can cruise at up to 6 knots - but it will require a big battery if you’re going more than an hour or two. I have a 48v/1,000AH Winston LFP pack. I figure I have a max range of 25NM at 5 kts.?

I will look into this. They were 50 Hp Diesels, No Idea of brand or max RPM.
Thank you for your reply.