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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Universal 5411....Hurth Transmission...propeller rotation
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Thread: Universal 5411....Hurth Transmission...propeller rotation Reply to Thread
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Topic Review (Newest First)
12-24-2013 10:08 AM
JimsCAL
Re: Universal 5411....Hurth Transmission...propeller rotation

I had a 5411 in my previous boat - a 30 ft Cal 9.2. It displaced 7000 lbs and did a pretty good job of moving the boat. I could get close to 6 knots wide open and cruise at 5 or so was very efficient (about 1/3 gallon an hour). It had a RH Martec folding prop and I believe it was about 12 inch diameter with a pitch of 10 or 11 inches. Not sure what the reverse reduction is - forward is 2:1. Here's a link to the manual if you don't have one.

http://www.catalina30.com/TechLib/En...5411_Maint.pdf
12-24-2013 08:32 AM
sony2000
Re: Universal 5411....Hurth Transmission...propeller rotation

There is some camber to the blade on the forward side, and flatness on the rear side. But the proof is in the pudding. Seven inches of distance per revolution, goes both ways. Merry Christmas!
12-23-2013 11:15 PM
Faster
Re: Universal 5411....Hurth Transmission...propeller rotation

Quote:
Originally Posted by sony2000 View Post
That 2 bladed prop is has almost the same efficiency in both directions.
Could be.. I suppose that depends on the cross sectional shape..
12-23-2013 10:51 PM
sony2000
Re: Universal 5411....Hurth Transmission...propeller rotation

That 2 bladed prop is has almost the same efficiency in both directions.
12-23-2013 10:40 PM
Faster
Re: Universal 5411....Hurth Transmission...propeller rotation

Quote:
Originally Posted by tcase10 View Post
I don't have a tach so I'm not sure of the rpm's. It seems to me that if the propeller is the wrong rotation, I am pulling the boat through the water by "clawing". And not propelling the boat. (If the transmission is in the correct position). Would this be correct?
Don't think so.... If the propellor is the wrong rotation the boat will be going the wrong/opposite way. However if you're running in 'reverse' to go forward then the prop blade is working in an inefficient backward direction (like it normally would when backing up)

When you put the boat in 'fwd' (as you're using it now) the prop shaft should be turning CCW if you're regarding it from astern. If that's true, then the LH prop is working as it should. Whether the gear is truly in 'forward' or not is another matter, but not a fatal one since hurth drives don't care which you use. The different ratios could have an effect on your ultimate speed (but so can so many other things.. cleanliness of prop and bottom most especially - though your photos show that things are OK there.)


When you can, try to confirm the arrangement of the control lever assembly and the gear arm position when going ahead... and the actual shaft rotation.
12-23-2013 10:21 PM
tcase10
Re: Universal 5411....Hurth Transmission...propeller rotation

I don't have a tach so I'm not sure of the rpm's. It seems to me that if the propeller is the wrong rotation, I am pulling the boat through the water by "clawing". And not propelling the boat. (If the transmission is in the correct position). Would this be correct?
12-23-2013 01:34 PM
capt jgwinks Most shifters can be reversed. The arm that pushes/pulls the cable can be taken off and put on the other way.
I think you could check the difference in gear ratios by running the engine while securely tied to a dock. If you get higher rpm in one gear, that ones running a lower gear ratio. You can also check by counting the revolutions of the shaft. Turn the engine over by hand one revolution with the compression release on, have a helper see how far the shaft turns in each gear. If theres no difference, then it doesn't matter.

Are you getting max rpm in fwd gear? Max on that engine is 3000, cruise would be around 2800. If your not getting that, then your over propped as it is and putting a larger one on, right or left, will just make it worse.
If your running a lower ratio in forward, you should be getting to max rpm more easily. The slower the prop turns, the less resistance and the faster the engine will run.

The only reason RH is considered "standard" is so that the prop effect pulling the stern to one side or the other in reverse is the same on most boats. If yours is the only boat you run, once you're used to it, it doesn't matter. If running the trans in reverse all the time hasn't killed it by now, it's not going to.
12-23-2013 10:21 AM
Faster
Re: Universal 5411....Hurth Transmission...propeller rotation

Quote:
Originally Posted by Capt Len View Post
What is the difference in ratio ,,for'rd/ reverse? Hurth runs good either way. If you spring for a maxi you solve all the problems.
Depends on models, but something like 1.8 vs 2.2 seemed typical
12-23-2013 10:15 AM
tcase10
Re: Universal 5411....Hurth Transmission...propeller rotation

Faster - I will have to check to make sure that the cable is moving as the manual says. I believe it is, but will check. Thanks.

Capt Len - I agree. My problem is when I call a prop manufacturer and give specs, they say right hand prop. That is not what is on there and I want to make sure I'm buying the correct prop.

More investigation required.....
12-23-2013 03:15 AM
Capt Len
Re: Universal 5411....Hurth Transmission...propeller rotation

What is the difference in ratio ,,for'rd/ reverse? Hurth runs good either way. If you spring for a maxi you solve all the problems.
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