Come on guy's he's trying to get some help and prolly real frusterated by the language barrier so if anyone understands maybe we can try to help not make light of his trouble. :(
Ludvabmw: I think you are trying to ask if anyone knows what prop you should be turning with this setup. What speeds and rpm are you getting with your boat?

Or was it something with cooling?

JUST ONCE


meanwhile I got on 4.850 speed and rate 90km with usual aluminous propeller 19
ship scales take in petrol 3000kg

HyperBaja

must have been produce two rotund cooling
motor is aluminous
and was it quite problem in the end I him made out of heating from aeroplanes
and functions first - rate

If you asking about a propellor -

What is your MAXIMUM or Highest RPM (revolutions per minute)
What size propellor do you have on the boat now?
What is the Motors Maximum RPM?

Rolling on the floor laughing my ass off

simple- Very funny, humorus.

What is your MAXIMUM or Highest RPM (revolutions per minute) 4850
What size propellor do you have on the boat now? 19
What is the Motors Maximum RPM?6500


__________________

Rolling on the floor laughing my ass off

simple- Very funny, humorus ????

Do I have this right?
boat weight full of fuel =6600lbs.
speed= 55.9miles per hour
max RPM achieved=4850
alluminum prop= 19pitch
The 5.6 V12 builds max Hp @ 6000 so I'd guess to try a stainless steel 17" prop but that almost seems too small. That motor should spin a 19" prop to redline with proper trim Shouldn't it?:confused:

JUST ONCE


Do I have this right
boat weight full of fuel =6600lbs. 3000kg
speed= 55.9miles per hour yes
max RPM achieved=4850 yes
alluminum prop= 19pitch yes