Re: PM box
 

Opps, I didn't see Expresscat39's mail cleaning request!:eek:

Michigan
 

Special permits cannot be used on Sundays. If you drag her over you will have to wait until Monday to come back!

Short of using a reversing box inside the boat on one side there is really no easy way to run two counter rotating drives with standard rotation engines.

Your drives have no means of counter rotating in them. It is far easier to purchase a reversing box for the one engine you would want to spin RH rotation and use that rather than taking the drive apart, machining it, making a bearing carrier, paying an engineer for the gear design, make new chains and sprockets, and so on and so on..

Weismann can make a simple box that will reverse the output from the input and you are finished. Two standard rotation engines.

Of course, it is far cheaper and far easier to just have a RH rotation and a LH rotation engine and the boat will handle better because of that as well due to the torque being canceled out from both the boat and the propellers.

Steering cylinders, these can be made as well as the trim cylinders. How are you steering the boat now? Do you have those Hynautic steering cylinders mounted to the mechanical tie bar that OE made?

Counter rotation
 

Mark, Rik point is very well taken. I have Counter Rotating engines. On one engine we had to also flip the blower and reverse the starter, etc.

What size props are you running?

Essentially, all that is different in the RH rotation engine is the cam, distributor gear, rear main seal and starter. A rear mount starter is a RH starter and a front mount starter is a LH starter. So when you counter rotate you just essentially use the opposite mount starter for your application.

Some will suggest a knife edged crank change for the RH rotation but if you are not spinning huge RPM it is a waste of $$

Thanks Rik
 

Rik,
I thought that they made a new drive that I could just install and maybe keep the U joint to the prop shaft. My steering rams are not Arneson. They are a heavy hydralic cylinder off brand. Dana, from Twin Discs, saw my boat and said that they were not Arneson cylinders. My steering is fine but the steering wheel constantly changes "center" position. I have to constantly change grip every say 5-10 minutes. Considering Latham heavy duty pump?

Props: 31 or 33 Rollas with 1.31:1 ratio
26 input shaft sprocket
34 output shaft sprocket

Towing with permits: I make one call and they tell what to do in each state.

PM is clear

Mark

These are not self centering helm units as you might be accustomed to with a cable steering meaning that the steering wheel will never come back to the exact same location each and every time.

The P.S. pumps need minimum pressures and flows in order to work correctly. I do not know what cylinders you have and such, but you will need adequet pressures and flows to make the system work correctly.

Props
 

I have a set of five blade Rolla on the way for testing 17 x 30.

What HP are you running?

Pitch of props?

4 or 5 blades?

Cruise speed?

Top End?

Slow ride
 

Dave Scott(Bacardi Silver) and I were deck to deck at the Ozarks.......






















Oh yeah that right, we were tied together at the docks at Shooter's 21.

MRD 900hp?
Rollas 18x29
4 blade balanced and blue printed
cruise= 70-80mph
fastest 100+ @ 5200rpm
WOT 6000 rpm= won't know until I get a spare set of motors or if I'm really cool, a second boat.

I still having picture problems.

Mark

props
 

I should hit 120-5 mph range running 900 lbs torque and 6000 rpm with the small pullys and pump gas.

The props are coming from TNT. Probably were on Dave Scott's boat!

Right now I am leaving the office to go pick up the freshly powder coated drives.