symondo
Well-Known Member
Think you may need to calculate with 10 GPH (ish) at cruise ... (32 - 3400 RPM from recollection ... Presume TMD40A's at 130 Hp each) .... legs trimmed in and with some help from trim-tabs, she should stay on plane until you drop down to about 14-15 knots... With only 20 Gallons, you are light, so should pop up fast .... but I'd be cautious about that if I were you as I cannot recall where fuel pick-up is on the tank .... and the last thing I'd want to do on a first time out would be to get air into the fuel system...
Better to potter around up the loch and enjoy half an hour at slow speed up the way and back bringing the engines up to low operating temp, and inspecting them frequently, then spend an hour or two mucking around manoeuvring before you moor up again ..... that should leave you with a comfortable margin in the tank ...
the intention is just to make sure all is as it should be and then moor her up until next week when the tank gets filled but yes definately dont wish to run the tank dry