pulse drive on 30' to 32' cat ???
 

HAS ANYONE EVER DONE OR SEEN A MID SIZE CAT W/PULSE DRIVES ?? HOW DOES OR WOULD IT RUN ??:confused: :confused:

I was also thinking about that. And the install, what happens to the swim platform, is it made to be wider to cover the big tunnel or does it get eliminated and the steering is in drives?

WONDERED IF 2 SEPERATE UNITS WOULD WORK? DO YOU HAVE TO RUN SOME SORT OF TIE BAR BECAUSE OF THE SPEED? SUPOSE WITH THAT TYPE OF DRIVE , A TUNNEL TAB WOULDN'T BE OF ANY USE

Just an observation, based on information from their site, I'd say a tunnel boat would have two single systems.
A tie bar wouldn't be needed because each system is self contained. Remember, the drives only move up and down, they use rudders for turning.

I talked to PSI about putting Pulse Drives on my ChrisCat. They said it would two of the 1750 units. There would be no tie bar need because Pulse Drives use rudders to steer. They use a 630 transmission that they send to Huber to beef up. I asked Tony if they had done any cats in the 30' foot range and he said they had not. He did say they have done some 50' cats though.
Looks like a viable option but I would like to see it on a similar application.

mike

PSI Drives
 

I had the pleasure of touring the PSI facility last week.
The pulse drive is one heck of a product. They sure do have it worked out...
I'm quite confident that two seperate 1750s will get that boat moving as good as #6 drives, and for far less cash!!

The Pulse Drives are almost Zero maintenance. Their trannys are tough enough for you to just leave the throttles mashed (assuming you have good rev limiters).
Spend a little time talking with Tony. He wouldn't steer you wrong.

YES I'VE SEEN THE RUDDER SYS. JUST WONDERING WITH THE SPEED ( JUST GUESSING 2/700-750 HP. MTRS. ) 115-125 mph. WOULD YOU NEED TO TIE THE RUDDERS TOGETHER SOMEHOW? ANYONE KNOW WHAT SPEED , HIGHEST , THAT HAS BEEN ATTAINED BY A PULSE DRV.?

When I talked to Tony at PSI he did some speed calulations (guesses?) and he thought I would be in the 120's and he did not mention a tie bar.

mike

talked to Frankie at PSI yesterday, mentioned the tie-bar quest. she said shouldn't need it. here's why i wondered about it, at around 120-125mph. a .75-1.25 degree missalignment would scub off at least 5-7mph(strictly speculating)at top speed. she said to her knowledge , fastest application to date was a eliminator or daytona that went around 100. never talked to tony .

How are you going to tie all those rudders together?

You will need some sort of a mechanical tie bar arrangement to connect the rudder tiller arms together or else you will have a very difficult time keeping things aligned.

if trim position was and should be parallel,and the rudders are attached and hinge at the front (front&top)wonder if you could drill & tap where it tappers back in the rear at the top. only thinking out loud, and by no means drying to knock psi. looks like great equip. i would be proud to own.can see it now ,on a trailer w/those drives,& JUST THINK ABOUT THAT ROOST THAT THING WOLUD LEAVE AT AT 115+ WITH TWO!!!!!!!!!!!!!!

If you look at their website you'll see two configurations of the single prop drive. One has two rudders and the other has one offset rudder. With the offset rudder, it's in line with the thrust coming directly off the blades.
I'm assuming to which side it's offset depends on direction of rotation.
With two single rudders you don't worry about trying to tie four together. Alignment would be simple.

One other thing to think about is based on Iggys suggestion about the rudders being offset for the rotation. Don't alot of guys like to switch the direction of the props (in or out) depending on corse & or condition of the lake. Would the rudder's be permanent as to where they are mounted, or can they be switched? At any rate, I would LOVE to see a cat in this size w/ these props. I think they make the boat look very mean!




:frog:

Question:
Do the props on a twin Pulse Drive setup counter rotate? I hadn't noticed.
Does the engine have to have reverse rotation for the prop to run left hand? Or is it done with the transmission?
Being surface piercing, do they have the same effect as submerged props (stern or bow lift) depending on direction of rotation?

I was told by PSI that the ZF tranny's are rated for full power in either direction. So, yes, the props can be counter rotated. Also changing rotation would be just a matter of switching the props from one drive to the other and changing the transmission linkage to alter the rotation of the tranny.

Anything other than a single rudder installation will have to be tied together for the boat to handle properly, especially when everyone has stated speeds of over 100.

The ZF 630A Gear has a 6" drop to it. You will either need an additional drop box or a very wide sponson in order to get the engine down into the boat.