2005 Honda 90 - which prop?

krc · Posted: Thu Sep 10, 2020 11:49 am Post subject: So this post got me thinking...

I have a CD25 with twin honda 90hp. BF90A.
Here is a snapshot out of water from a while back:

Does this look too low by an inch or so? I guess I need to get out and check. I believe the prop is 13.25x17.

I always put the motors full down from the helm control and use the trim tabs to adjust bow. I wonder if I don't put the motor down all the way, when on plane and bow is up if the angle would be better? I do get a lot of splash between the engines, but not what is "normal".

I always seem to peak at WOT around 5200-5400.

thataway · Posted: Thu Sep 10, 2020 4:34 pm Post subject:

Your are probably "propped" correctly. Your best trim is not with engines all of the way down. To get the best speed and efficiency on plane. Bring the boat to a plane with trim tabs down, engines down. Then bring the tabs up to near neutral, as long as the boat seems to be running level. The gradually bring both motors up--about mid range. There will be some bow rise. But the RPM will increase, and you probably will be close to 6000 RPM with that boat and motors.

The Permatrims should be running right on the surface of the water when properly trimmed and on a plane.