Two years ago, I got a 'Fisher-like' boat :
V transom,
length 21', beam 9',
dry weight 2.5 tons,
one outboard Suzuki DF115,
one 3 x 13.5 x 15 prop.
Due to the weight, speed was about 18 kn @WOT (5500-6000 rpm)
Knowing that 115 HP were not sufficient, I found a good deal for a second suzuki DF115, same engine, same prop, NO counter-rotation.
The result looks good : 20 kn @ 4400 rpm (26 kn at WOT, hard to maintain due to torque).
But I noticed that, at 4400 rpm, there were on the rear, like 2 walls of water, about 1 foot high, on each side.
I remembered a picture showing those 'two walls' as an example of incorrect height for the engines, but I cannot remember if they are too high or too low.
The service man put the two engines so the A.V. are exactly at the level of the limits of the 'V' (see the picture), as far away each other he could.
Anybody to tell me if engines mounted too high or too low ?
Thanx in advance
V transom,
length 21', beam 9',
dry weight 2.5 tons,
one outboard Suzuki DF115,
one 3 x 13.5 x 15 prop.
Due to the weight, speed was about 18 kn @WOT (5500-6000 rpm)
Knowing that 115 HP were not sufficient, I found a good deal for a second suzuki DF115, same engine, same prop, NO counter-rotation.
The result looks good : 20 kn @ 4400 rpm (26 kn at WOT, hard to maintain due to torque).
But I noticed that, at 4400 rpm, there were on the rear, like 2 walls of water, about 1 foot high, on each side.
I remembered a picture showing those 'two walls' as an example of incorrect height for the engines, but I cannot remember if they are too high or too low.
The service man put the two engines so the A.V. are exactly at the level of the limits of the 'V' (see the picture), as far away each other he could.
Anybody to tell me if engines mounted too high or too low ?
Thanx in advance
