I have a Lagoon 400 catamaran
with 2 Yanmar
3JH5CE engines and 2 Yanmar SD 60 Saildrives. Theyre 39HP and the max revs is about 3200. We have been running the engines in so have been operating them at 2800 RPM mostly which gives a crusing speed of around 7 k on one engine
. Props are folding 3 blade flexfoil. Fuel consumption
is around 3.75l/hr at that speed. Id like to make a consumption/speed/range/revs spreadsheet if anyone else can fill in more estimates/details would be great.
Something like the one here.
Twixter -Â* Performance
Heres the details for our last boat.
capacity: 2 x 110 Liter tanks
For trip planning purposes (Conservative), each engine burns approx 2.1 Liters of diesel
per hour @ 2100 RPM, which gives up to approx 52 Engine hours per engine per tank.
One engine @ 2100 RPM gives approx 4.3 kts of speed in calm water
, which gives approx 234 nautical miles per tank using one engine.
2 engines at 2100 RPM gives approx 5.5 knots
2 x 100l tanks
+ 2 x 20l reserve jerrry cans
3000 revs one engine 7k 3.3l/h range 30 hrs/tank 210 miles /tank
2200 revs one engine 5.5k