I just posted an update on how things are going at the Miami
show so far - see the Electric
Yes, the speed/rpm/power graphs are exactly
what we want to plot - with a selection of different propellers on the boat - after the Miami
is a couple of hundred pounds lighter than production diesel
leopards, which the brochure quotes as being 19,030 lbs/8,630 kg. I presume this is a "light" displacement
No propulsion battery
bank, so we don't carry the 1,500-2,000 lb weight penalty for that.
The two 35HP motors on my boat weigh 162lb each, the production boats will have 2x20HP motors, which weigh 146 each. See here
GB just replaced then gen before the show with a production model. (Mine was pre-production, developed a little less than the full 25kw, and was looking a little tired after a year of use). The few extra kw does, apparently, make a perceptible difference to boat speed - I'll see myself shortly.
25KW is max gen power and will drive the two motors at around 17HP each. The motors on my boat are over-sized (35HP max - prototype boat), so you can actually drive one motor
at a time at 34HP if you want. The production run cats will have 20HP motors. Smaller, lighter, cheaper.
2x17HP is enough to get to 8-8.5 kn quite nicely, and enough to heat water
, run air, charge house batteries, etc. too.
NB: It's a variable speed DC gen
, so if you're not drawing full power, it slows down and burns less fuel
, so there's no downside here. Nice power with you need it, less fuel
burn when you don't, no ac:dc or voltage conversion energy losses, no wet-stacking
to generate pollution and shorten oil/gen life...pretty cool gen this. And it weighs only 550lb and runs quiet at 65dba. See gen data here
Originally Posted by Whimsical
Great to see people taking the plunge with electric
. I hope you will have time to compile a table of speed versus current
draw for us.
I have quickly scaned your other posts but didn't find any info on the weight of your leopard
25 kW seems pretty generous for electric propulsion
at your size and is reflected in the speed of 8 knts. Is that maximum power ?