Fantastic the first complete set of data thanks to Mike.
The Gato Verde is a 42' Fountaine cat, weight between 8.6 and 10.6 T.
27hp (3gm30) saildrives propelled it to 7.4 knots in calm conditions @ 3400 RPM
. From Yanmar engine
propellor power graphs this would be about 17 Kw per engine
so 34 total, nearly full throttle. The graph is a speed table for the electric
install. At 7.5 kts it shows 350 Amp draw or 17 kW, half of the diesels. This figure must be the combined draw of both motors as the Lynch 200 motor
is only rated to 175 amps at any voltage up to 72. L.M.C. Manufacturers of Permanent Magnet DC Motors
Original estimates seem to tie into the real world quite well 12 kW, 250A,in the real world gives about 6.8kts. The estimate was 7.1. Sorry can't seem to post this table, have to look at the link. 12 kW is significant for me as this is the size of the gen set I would use also.
It must be remembered that this instalation has used the sail drive leg with its gearbox
. Discussions on the electric boat site claim about 1 kW lost
for the box and a couple of right angle drives, which seems reasonable, so things could be improved further with electric.
A couple more good sets of data like this and I will be convinced.
My setup is becoming more feasable the more I look into it. Given my lighter weight 6.5 T power level does not seem to be an issue. The E-cycle gen would not be as heavy as a 20 hp plus sail drive and associated equipment
. It doesn't even have a starter motor and battery
. I was going to use 2 X 250 ah agm
house batts now only one 100 ah and four 250 ah for propulsion
. This equates to an extra 140 kG, about the same or less than the diesel
that gets the bums rush. Another 75 -100 kg gone as I do not now need an aux gen set so I am now under weight and have oodles of gen when needed and 1100 ah house bank on the hook. It just keeps getting better.
The Glen-L site details the constuction of an electric drive utilising the lower part of an outboard
. It is installed through the bottom of the hull
much like a sail drive. The unit when installed is steerable. Twin engine with vectoring thrust, I'm excited.For those who are not Aussies
there was a big guy on tv here flogging cleaning products, Big Kev, and he always finishedwith an enthusiastic I'm excited.
Electric Drive - electric drive system-Boat plans, kits, inboard hardware, Boat building supplies, epoxy store
Nearly full construction details online.