Some more thinking...
How fast is a Revenger 27/29 with one 225 Yamaha 2-stroke/4-stroke? And if you put 2 on? Fuel consumtion with one at topspeed must be around 1,6-1,8 litres/nm. And economic in "around" 35-40 knop, 1,2-1,3 litres/nm. And with 2 it canīt go 2x? My guess is topspeed with 2 engines will take 2,7-2,9litres/nm. And economic 2,0litres/nm.
I will never have so much weight on the boat!
Another engine choise! Volvo Penta/Mercruiser 5,7! and 320hp must go very good! What do you have to say about the speed and fuel consumtion. The dieselengine must be 2 times more expensive to buy. If you looking at the yanmar 315 and compare it to the Volvo/merc.
Speed 225 hp (one) Fuelconsumtion?
Speed 225 hp (two) Fuelconsumtion?
Speed Mercruiser 320 hp (one) Fuelconsumtion?