2001 Horizon 76 - Sea Trial

21/22kts sounds pretty slow at WOT for a 76 footer with 3412Es... Were the trim tabs down to get best speed? Could some pitch have been taken out to get tires engines to turn RPM?

i used to run a Johnson 70 Skylounge with the same engines which hit 30kts on sea trial with 5400 hours on the engines. A 76 is a little heavier but still that s sound slow.

Is the boat stabilized? An unstabilized skylounge isn’t going to be fun.

How quick was the heeling to Port? I ve never seen that unless maybe the trim tab was full down on the other side and / or you had quartering seas. As J said, counter rotating props should even out the torque

I think I may have read something different; One throttle with out the other engine offering any or less torque to the hull, then the second engine up and leveled out then?
Trim tabs on a 76' boat with stabilizers??? Like a car jack for an ole Citroen.

Both engines offering the same torque on the hull should not have listed the ship, One with a lot of power on could, IMO.

How loaded was the boat? fuel , people, mother in-law & lots (lots) of live-a-board clothes, groceries, spares, stuff & junk?
Stabilizers showing centered? May have to double check the stabilizers for zero angle, un-parrelle fins will rob some speed and cause some strange manners.

I also would liked to see a lil more speed. Maybe full of junk. Like our boat, live-a-board for 17 years, some top end speed has been lost.

I read it to fast. Sorry 'bout that.
I still think there is an error somewhere. Maybe a damaged wheel or un-parrelle fins.

Heck, it could be the stb tab was already down, the port tab is leaking and had to get pushed down again, seas and/or waves on the hull as you sped up or the fat guy in the back changed sides.
Maybe to much tab kept the boat level and bow in to much slowing you down.

Time for another ride, schedule a few of us next time..

Just pinning the servos may not mean the fins are straight.
Usually, the fins are on a long tapered shaft like a propeller, just no shaft key. It is not easy to do, but a grounding or collision may move the fin on the shaft un-detected.
I'm glad you commented that Naiad has been on board. Gives me a nudge there may be something still amiss.
Since my last post here, I'm still wondering about trim tabs on a boat with stabilizers.
May be time for another surveyor and Cat tech.
Oh wait,, Pantropic?
Let me type that again; May be time for another surveyor and Cat tech.

Pin the fins and have a diver measure that they are parallel to the chine or keel or have her picked up with locked fins.

I ve run two skylounges for the last 12/13 years. One a johnson 70 and now a Lazzara 84. I ve had run Either many many times with 30kts on the beam at hull speed I’m protected waters and never had different loads on the engines or any list/heel. Never. And the johnson was not stabilized.

something is wrong with that boat.

If the fins are a-mis. Calibration requires to find the servo center, then adjust the fin / shaft to that. Servo center requires finding the dead bottom of travel of a hump / valley in a cast cam part of the big/whole servo assembly. A rheostat is roughly installed on top of the shaft after all of this. On the op panel, it just shows a rough position of what it thinks is the shaft center (subject to a lot of BS inputs).

The locking pins should be close from the original install but may not be a real center line of the fins, just close enough to operate in the event of a pump or other failure. In my past I have found the locking pins to be dead on, on others several degrees off line.
There are hull dynamics where the fins maybe toed in/out just a few (very few) degrees. These would be in the Naiad (factory/Naiad) only black book.
If I'm close to these errors, you are past these micro specs.

Since I do not see many (any) objections to my ideas, I may not be far off on these plots.
PM me for a phone number if needed.