Hi
Just curious on everyone's thoughts on my observations on almost 2 identical boats as I am trying to get a better idea on how these 852 pumps work regarding there great ability to be set up for so many different applications...
-I am currently running an 852 with a standard and pro impeller. (front stand rear pro I believe?)
-My friends boat is running an 852 with two pro impellers...
-My boat is a 21 ft, 7 ft bottom, 109 beam...built heavy to take abuse. 12 deg delta pad.
-My friends boat is exactly the same only 20 ft long (1 ft shorter)
-Both boats have GM 6.2 LSA engines
-Both 111 mm nozzle
So far we have noticed his cruising speed per RPM is much higher than mine. As an example if I am running 3500 rpm at approx. 29 mph..my friend will barely need to run 3100-3200 to stop from overtaking me (slowly as if he was trying to follow me up river for example). My friends gas usage also seems to be much higher at equivalent RPM to mine. We ordered the boats together and decided to get the impellers set up different so we could gauge what would suit our running styles better and then possibly change impellers out in the future. Currently both boats seem to get on step the same time with roughly the same load, however we both have to feather the throttle ever so slightly. I switched to a 108mm nozzle size and my hole shot improved a little bit as I could almost go full throttle from a stop but I noticed no gain in cruise speed per rpm and seen more fuel burn. Top speed my boat is slower, I attribute that to my boat being 1 ft longer (heavier, more drag, etc)
What are the main characteristics, positives, negatives, etc of the different impeller set ups we have and changes in nozzle sizes? We generally will be using the boats for long loaded up trips.