I have maybe problem with installing height. The bow jumping at full speed. Does anyone have any experience of right mounting from the height of NXT6 to Fountain 42?
Sorry bad english, i am from finland =)

Right word my problem is "Porpoising" i think.

Not sure about height, but if its never been changed, it should be fine.
Most likely the propoising could be corrected with propeller changes.

I had the NXT on my Outerlimits SV 43. Those drives have a big flat front. The are very bad when you start to run fast, they blow out the water away from the propeller, so the boat handle poorly. I had to run the drive height very high to get them to work. I ran 2.5 - 3 inches above the bottom. If you raise them to high the bottom front of the drive acts like a water ski and will lift the back of the boat up, be carefull. Again its a bad design, I switched to #6 drives. Try as many propellers as you can, more diameter may help.

NXT,s on a Fountain , sounds odd should have 6,s .

I have a dry sump #6 drives. No NXT drives.
drive height is no about 2 inches above to bottom and propellers are hering 6 blades.
Which one is better 5 or 6 blades?
Are you think i must take 1 inches more upper drives?