Excessive Slippage on a Triton TR-20HP

[outsidesmoke]

07 Triton TR-20x HP
225 Pro XS
26p Temptest
1.75 torquemaster

Half a tank
One livewell full
Moderate/Light Tackle
Me

6000 RPM
71MPH GPS
Light Headwind
16% Prop Slip

Seems like 16% is a bit high for this setup and ideally would like it see it get up to 75-76mph (10-11%). The prop has a couple small dings, I'm sure this is contributing something to the problem but doubtful that it is the entire issue. Any thoughts?

[Almag6]

confirm your tach readings

[mdtritn21]

What's your prop to pad now the way your running and how much set back do you have. It should be 2.5" under pad with at least an 8" plate. The dings don't help and if that 26 tempest has never been worked that's another problem. The older 26 tempest were not very good out of the box and need some work to run right.

[outsidesmoke]

What's your prop to pad now the way your running and how much set back do you have. It should be 2.5" under pad with at least an 8" plate. The dings don't help and if that 26 tempest has never been worked that's another problem. The older 26 tempest were not very good out of the box and need some work to run right.

Exactly 2.5" under pad. I don't know about the history on the prop but assume it was relatively new because the original owner replaced the lower unit.

I have a 6in plate. Prefer to leave it as is as it is already a tight fit in my garage.

I've compared my tach to the merc monitor before and they were the same although I'll admit I had engine temp up when I made that run

[21XDC]

Exactly 2.5" under pad. I don't know about the history on the prop but assume it was relatively new because the original owner replaced the lower unit.

This makes me question if it's a non OEM LU...

[outsidesmoke]

This makes me question if it's a non OEM LU...

Doubtful, I don't see anything on the LU that would indicate it isn't OEM and work was done by Nixon's Marine which has a very good reputation around here.

To add a few more details. On this particular run I was really focused on minimizing chine walk.

I slowly worked up the trim until she was running at 6k and it was no hands straight as an arrow. Just the way the waves felt on the pad (more at my feet than under the seat), I could tell she could have taken a smidge more trim to break it loose. I was already at 6k I didn't want to over rev the engine.

So the question is, would that extra bit of trim getting the bow up actually increase RPMs or would the added efficiency from a bit more bow life increase the speed of the boat without over revving the engine.

[mdtritn21]

If you were not getting the over rev alarm give it more trim. The max rpm's on that motor vary with the load put on the motor. Most guys run them at 6100 but I would get the prop repaired.

[BrownTrout]

To answer your question, all boats/setups are a little different but generally more trim = more bow lift = less boat (friction) in the water = more RPMs and speed.

I prefer to prop just a tad under the Limiter when running light than over.

I'd send the prop off to Mark Croxton stating your goals for the prop. Fill out the work order shown at the top of the page and include all the current info on ptp setting, RPMs, WOT speed, motor type, boat type, etc.

[lpugh]

Try a 25 Fury ran 1/2 deeper, will have a better hole shot and maybe 1-2 mph faster. The have Mark rework the Fury. Would expect 74 to 75 at about 6000 at low elevations. After it is reworked it will run at the same heights as a tempest and faster

[mdtritn21]

Run it again and see if it loses speed as you trim up to max trim or if it's throwing a rooster tail when running.

[lpugh]

I think he is to high on the motor for his setup and prop or maybe it is not truly a 26 pitch, have Mark check it out

[Hammmerhead]

You need an inch less pitch.