21 prop, permatrim, and engine height

[DSW]

Hi,
I recently got a 2110 and it's a great boat I'm learning how to use. I understand the 2110 is the same hull as the 2120. Lots of good information here and I've put on a new prop and am looking at adding a permatrim. I have two questions. What mpg should I expect? When I get the permatrim on, should it be under water or just above the water on plane?

1997 2110, Yamaha 175 carb Salt Water Series II, one hole showing on top so mounted in 2nd hole.

Thanks for your help.


Old Prop RPM Speed Slip
17M 4000 27
5300 38 17
on plane 4000

New Prop
Q3 15p
RPM Speed Slip
1000 4.4 45
2000 7.7 49
3000 11.8 49
4000 25.1 19
5000 34.8 8
5500 39.0 7
on plane 3400

 

[Megabyte]

Honestly, I would raise the motor before trying anything else.
The factory and dealers always rig them too deep.

Mine was a 2520 with an OX66, but yours should get similar (good) results).
You can see where the factory rigged it, and how much I raised it.
Honestly, I think I could have gone all the way up.

BIG difference in performance with just this one little adjustment.

 

[DSW]

Thanks for your advice about raising the motor. maybe some 2120 owners will chime in too.

 

[shawnee83]

I would leave it mounted where it is now, one hole from all the way up. Put the Permatrim in it and you should be good to go.