Mercury 50hp throwing water into transom

[jenniferk]

I have a 400DL Novurania with a 50hp Mercury and extra large prop. When motoring over 10 knots, water pours in the back of the boat. I'm tired of having to change my wet shorts every time we go out. Thoughts?

[uncle al]

Is the obm deap enough in the water?Is the propeller skiming the water surface? It should be under water,is it the correct pitch prop for the boat?

[A1an]

Originally Posted by jenniferk

I have a 400DL Novurania with a 50hp Mercury and extra large prop. When motoring over 10 knots, water pours in the back of the boat. I'm tired of having to change my wet shorts every time we go out. Thoughts?

On the other hand it may be sunk too low

[jyasaki]

I'd bet too low. Jen, can you get a pic of the back of the boat while on the trailer, taken about even with the keel, with the motor down?

Anti-ventilation plate should be about (plus or minus an inch or to) even with the lowest part of the keel line. Can often be substantially higher, depending on turning performance under power.

jky

[Peter_C]

Something like this. Yellow level is up against bottom of cavitation plate.

[Locozodiac]

If water splashes over middle transom into deck, your engine height is too low, rise engine accordingly untill water flow at wot lightly skims under small upper water deflector plate. You must have a rib well, ballanced, correctly trimed...

If this helps...

ABC Sib-Rib Installation Guidelines.-*/ 628902

Happy Boating