Hi Josh,

I know trying to dial in a boat that has issues can be rather frustrating. Especially when you are starting from scratch. You have a issue that you can't figure out. We are just here trying to help you through it. We are only as good as the information we are supplied. I always wish I could be in the boat with you. That way we could help each other get to the finish line faster.

Remember, boating is supposed to be fun.

Your slip is high, your boat atitude is less than desireable. When you say "they want me to" you are being a little over zealous. Suggesting lower "X" dimetions is not saying we require you to do that, we are giving you options as to the problems your boat might be having and the physics that can correct that situation. Boats are tough. Many variables. Each change in singular order helps us to learn and move in the correct direction.

Less diameter will definately adjust the boats list (decrease it) more but less diameter will not aid in your slip number unless the diameter changes are sustantial enough to create big transom lift and drive leverage changes. I agree the depth of the propeller isn't high. But, the slip is still high. Why? Trying to harness the slip is the first move. Could going up in X help, maybe, probably not. Do you want to buy a short drive to do that test? Thats why we went to bigger diameter 5 blades to troubleshoot.

fixx, RH already. Josh, we can test with either rotation.

Using stock propellers at their designed geometry helps us to get to the root of the issue.

6 blades.......don't think so. Custom 5 blades, probably. Getting to the ultimate set up can take longer with some rigs than others.
Don't worry, you'll get there.

Brett

Thanks brett. I still have a blast boating even though im not in the 80s. lol. And i know that if it can be figured out you guys are the ones that can do it. I currently have two of your props. the hydro 5 blade 29 and the maximus 5 blade 28. i got better speed but more slip 20% with the hydro and 18% slip with the maximus but lost 6mph. so im going to send the maximus back to you and keep the hydro and try 2" of drive spacer unless you have a different prop you would like me to try? I admit im a little discourage with all the $$$ ive put into this boat and ive only gained 7mph but its still fast and it runs great and has unbeleavable mid range acceleration. so im happy with that. Ill be patient as long as you guys continue to give me great service as you have been.

Thank again!!

Nice post!

The drives can run in either direction, a lot of single Fountains run with a left hand drive. If you wanted to test a left propeller you can, just shift the boat into what would normally be "R" and go....if you decide you like the left better then swap the shift cable under the shifter.

As far as the prop slip just stick with it, you will finally get there.

[QUOTE=Baja_man;3723502]The drives can run in either direction, a lot of single Fountains run with a left hand drive. If you wanted to test a left propeller you can, just shift the boat into what would normally be "R" and go....if you decide you like the left better then swap the shift cable under the shifter.

As far as the prop slip just stick with it, you will finally get there.

Thats cool. I didnt know if reverse is as strong as forward. Aparently it dosent matter with an outdrive. In a truck axle the angle the gears are cut makes them stronger rotating one direction than the other. for instance in an offroad rig you cant buy a standard low pinion axle, cut and flip the diff and turn it into a high pinion with out buying reverse cut ring and pinion gears......

I love this site. I learn something new almost everytime i log on.

That is one of the beauties of the Bravo drive. You can shift to reverse and test forward operation with a left hand propeller (or vice versa). Most other drives won't work though. Outboards will work but it isn't a good idea for more than a quick test since the engagement lugs are half of the volume that they are in forward.

Brett

I think you are fine with the gears unless there are some significant wear patterns. But, going off memory running a left handed prop puts a lot more stress on the top cap.

How much HP are you running????? It takes close to 600hp to get a 280 PQ to 80mph.

A propshaft 5.5" below the bottom should be plenty deep already. I would not be overly concerned with slip percentages within reason.
A slightly higher slip % will be easier on the drive.

It will take nearly if not all of 675-700 hp to move a 280 Silencer to the honest 80 mph mark......ask me how I know...

Slip may be easy on the drive but its killing my top end.if my drive cant handle it ill buy a imco. I spent thousands to get the power i have and i will not stop untill i see 80 on my gps.. as far as HP. Stock is 415. CMI add idk at least 50? You guys tell me. Procharger set up im running thay guaranted me 200hp gain. Do the math. 675. Its got the ass to see 80. Its all about getting the boat set up right.