by our consomption:
at 1400 rpm 6,6 knts and 0,61lt per nm on one engine (Perkins 6.354 215c)
At 1600 rpm 7,4 knts and 0,92 lt per nm (one engine)
At 1850 rpm 9,8 kts and 1,78 lt per nm (two engines)
As you can read at :
Motorisation - Le blog de long-cours
The "circumstances" choose the engines for us
but in reality two same Perkins but atmo and 110/130 hp was clearly bigs enought for keept our hull speed (10,40kts) in all circonstances.
Full load (rarely !) 72750 pds (average 67000 pds)
lenght wl 60'
gear box 2,53/1 (for the price on a precedent boat we had 3/1 seems to be more efficient)
propeller 4 blades 27"X27" but something I don't like whith this propelers they "take" exactly the Perkins propeler curve of the ....130 hp model
, and can't get answer from propeller factories