Refueler
Well-known member
My Colvic Watson 34 is 12 tons or thereabouts & has one 65hp engine. When I bought her she was on the Norfolk Broads, we did Lowestoft to Brighton in about 32 hours non-stop, using about a gallon per hour. Tide with us some of the time, against some of the time. It was a bit rolly at times but far from uncomfortable because we chose a calm weather window. Very enjoyable trip. I'd have no hesitation whatsoever crossing the Irish sea or over to France in the right weather in her. I think you're worrying too much about the sea crossings...
My Sunrider 25 is 4 tons ... bilge keel ....
Crossed Baltic number of times .... it crossed Eng Ch .. Channel Isles ....
Perkins 4-99 38HP in her when I bought her ... then that was swapped out for a 2nd hand lump of rust 4-107 43HP ... 20yrs later that lump of rust looks same but purrs along never missing a bit.
Engine alone without sails : Cruise speed 4.5 - 5kts ..... 1.5ltrs / hr ..... max speed 9kts but fuel consumption then goes WOW ... probably about 5+ lts / hr
With sails : Cruise speed 4.5 - 5kts .... ~ 1.2 - 1.5lts /hr
With regard to tide punching ... having that boat at Langstone - then Chichester Hbrs - with the crazy tide races at entrance ... she punched through fine ...
TBH - I think OP may be putting too restrictive factors on the boat ....
I also have a 24ft MoBo... weight ? Maybe 1.5T ... has Volvo Penta 170HP 6cyl gasoline engine ... cruise at 14kts - burns about 10lts/hr ... open her up and you can burn over 25lts/hr .. estimated 25kts. Drop her to 7 - 8kts and in fact she can burn worse rate than the 14kts .. about 6 - 7lts/hr.