cyber
Petty Officer 3rd Class
- Joined
- Aug 9, 2010
- Messages
- 82
My problem is where to position outboard on transom because of stepped hull.
I know on a boat without stepping, you place the cav plate even with or slightly
above keel line, but what about stepped hulls?? Even all the way down it wont
reach the bottom of the keel, so that theory doesn't hold water.:facepalm:
Currently I have it mounted in the 2nd hole from the top and have a nasty problem
with porpoising until I get to WOT and then it skims along pretty good. I'm thinking
of raising it one or two more holes since it now sits about 3 or 4 inches below the
bottom edge of the step, and I have to trim it almost to the extreme 'out' position
to reach 5500 RPM and hit about 48 MPH. The Merc prop calculator tells me I should
reach 57 to 58 MPH with my setup. I'm just afraid of starving the motor for cooling
circulation, anybody have a similar setup that can offer any input??
Thanx in advance!! Cyber.
BTW, my boat is a 17.5' Freedom 170, and I have a Mercury 150 HP XR4 on it.
I know on a boat without stepping, you place the cav plate even with or slightly
above keel line, but what about stepped hulls?? Even all the way down it wont
reach the bottom of the keel, so that theory doesn't hold water.:facepalm:
Currently I have it mounted in the 2nd hole from the top and have a nasty problem
with porpoising until I get to WOT and then it skims along pretty good. I'm thinking
of raising it one or two more holes since it now sits about 3 or 4 inches below the
bottom edge of the step, and I have to trim it almost to the extreme 'out' position
to reach 5500 RPM and hit about 48 MPH. The Merc prop calculator tells me I should
reach 57 to 58 MPH with my setup. I'm just afraid of starving the motor for cooling
circulation, anybody have a similar setup that can offer any input??
Thanx in advance!! Cyber.
BTW, my boat is a 17.5' Freedom 170, and I have a Mercury 150 HP XR4 on it.