i have a 29 warlock world class v bottom,tried several diff. props,6 blade,and 4 blades,,,,the boat loves the 32 lab 4 blade and has gone over 100mph,but at any speed over 90 it begins the power hop,and every time the boat lands it scrubs speed.just seems as if it does not want to carry the bow?????????the 4 blade is a 15.25x32lab,will removing 1/4"of diameter help my situation?the motor makes 850hp/the drive is a imco 1"shortie/1.50 ratio/turns the 32 5800 rpm/103mph so far.

You are in the correct propeller design for the Warlock. You do have a pretty good size power package that needs to considered. Your slip is at 10% which is great. Can you describe the power hop, every time you re-enter the water you will undoubtedly scrub off speed. I am sure what you asking about the "power hop"

Julie

As the boat continues to rise with its running attitude at high speeds, the propeller can no longer carry the bow. Depending on your X dimention, removing diameter may help the porpoising but also increas the slip. We typically don't like to do that with Bravo 1's though we do it occasionally.

Did you run the boat set up with a standard length case prior to the shorty? Did you use the same propeller? Do you know where the CG of the boat is? This may or may not be fixable with the propeller.

why is it that the prop can no longer carry the bow?it seems that if i can get the back of the boat setteled in the water it would help carry the bow,it has to much ass lift.the power hop is hard to explain,it carries the bow slightly,then it drops down,,,,but never seems to un hook the prop?this becomes a pattern, more noticable in calm water.

This is why I was asking you about the "Power Hop". Can you describe what behavior the boat is exhibiting and the RPM and speeds that it occurs?

Julie

Calm water will amplify the effect because there aren't any variations to the load on the hull along the running area.

The propeller doesn't have to break the surface for the situation to occur (so it doesn't seem to unhook). As soon as the length of the boat falls, it catches and loads with water, the propeller begins to leverage the bow again and brings it back up.

Again, did you run the boat with a standard length case previously?

If your situation is new, It may be X dimension related. If not, consider having the bottom of the boat checked.

the speed is over 90 mph,the rpm this begins is just over 5500 and does not get better alll the way to 6000,,is it worth trying to take a 1/4"diameter out of my wheel?if i do and it dont help,will the prop be no good any more?the bottom of the boat is pin straight.

The prop will still be usable. We have cut down Bravo 1 props before.

I'm still wondering if you have ever run the boat with other propeller depths?

What were the results with the other props you have tried?
Who lab finished the 32 Bravo you have now?
What is the distance of the center of the propshaft to the bottom of the hull?
How does the boat get on plane?
Does you 32 Bravo 1 still have the diffuser ring?
Is the motor NA or supercharged? Do you have a dyno run on the motor?
What power did the boat have prior to the current engine, what about the previous drive. Did you raise the drive? What characteristics did the boat have previously with the old power?
You should not need to reduce the diameter of the prop. With the power you have bow lift should not be a problem.
What effect does drive trim have on the hopping? How much trim do you have to put into the drive to obtain max speed?

Matt

shortie drives reduce drag but also reduce leverage. try the same prop with a standard length drive & see what happens.