Rexroth throttles on Mans

swaterhouse said:
I agree with @ranger58sbThat said these boats handle great with these big MANs, so no need to rush docking at all, smooth and slow works just fine.
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This. I find the less I do with the gears when docking the better. I do it all in extra slow motion, just line up the boat then let the boat do what it’s doing and do small corrections with the thrusters, or momentarily touching one of the engines into gear and immediately back to neutral, and never both engines at the same time except when spinning.
 
SeaNile said:
I noticed that pause during the ride. I'm sure there time delay is minimal but it sure felt like forever watching the lever go forward till the time the gear was actually engaged.

Throw back about 20 years when I offshore fished....isn't the trolling option for the transmission actually slipping of the gear? I just remember all the big boats talking about getting to 4-4.5knts for white marlin fishing by using trolling valves which really meant the transmissions were slipping.
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I haven't noticed much time delay... maybe below my threshold...

Ref trolling valves: yep, that's generally how they work. The ZFs on our previous boat had an extra oil loop and the trolling valves controlled how much gear oil was routed through that extra loop... in turn, slipping the gears. I dunno yet how our Twin Discs work that, but I'd guess probably similar. I dunno if aftermarket gear oil temp and pressure sensors might be available or not... but since trolling on the Chesapeake is usually at 2-3 kts I might check into something like that if I were to do any serious trolling again (not likely). OTOH, like I said, we used trolling valves extensively, for years, on the previous boat -- without having a clue about temps or pressure.

-Chris
 
carterchapman said:
I find it interesting that my Yacht Controller (Actually mine is a “Captain Controller” brand) works instantaneously. I use it exclusively when docking.
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+ 1 on the Yacht controller, Stand on the back of the boat and back it right in the slip. Money well spent!!
 
Does anyone happen to know if these throttles on a 2010 580 DA are CANbus or analog? I'm getting a dockmate installed and they need to know. They said a picture underneath would indicate which it is but unfortunately I'm nowhere near the boat
 
jlanka said:
Does anyone happen to know if these throttles on a 2010 580 DA are CANbus or analog? I'm getting a dockmate installed and they need to know. They said a picture underneath would indicate which it is but unfortunately I'm nowhere near the boat
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I am pretty sure they would be canbus on a 2010. I would ask the selling broker to grab a picture for you, or ask your engine surveyor for sure if placing an order.

That said, please report back how you like the dockmate.

Next summer we plan to get my wife some stick time and swap roles as I am better suited to line handling. If she decides she doesn't like that we will be installing a dockmate or similar so I can at least assist with lines.
 
I have a dockmate on my 40pc and really like it. I use it once in a while for actual docking but I use it all the time for anchoring. Really useful there.
 
jlanka said:
Does anyone happen to know if these throttles on a 2010 580 DA are CANbus or analog? I'm getting a dockmate installed and they need to know. They said a picture underneath would indicate which it is but unfortunately I'm nowhere near the boat
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Where you docking that thing in Lauderdale? I am back there on Friday if you need a pic and it is near me I can grab it for you as I will be at my boat in the afternoon. I am at Davie blvd. Bridge and the New River.
 
ocgrant said:
Where you docking that thing in Lauderdale? I am back there on Friday if you need a pic and it is near me I can grab it for you as I will be at my boat in the afternoon. I am at Davie blvd. Bridge and the New River.
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Not sure where she is right now let me find out tomorrow. Thanks for the offer.

Jeff
 
@ocgrant I just noticed they got your acct changed to Bahamas boating ambassador!! Great!!

So listen, I’m in Jupiter. Maybe I should drive to Lauderdale and we take @jlanka’s boat for a sea trial for him…. To Bimini??
 
tc410 said:
@ocgrant I just noticed they got your acct changed to Bahamas boating ambassador!! Great!!

So listen, I’m in Jupiter. Maybe I should drive to Lauderdale and we take @jlanka’s boat for a sea trial for him…. To Bimini??
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Great minds think alike! Following a couple threads and I saw this coming.
@jlanka "You gotta ask yourself" How many times will you get this opportunity?
Can't remember your location/where the boat needs to end up at, but just some thoughts.
 
tc410 said:
@ocgrant I just noticed they got your acct changed to Bahamas boating ambassador!! Great!!

So listen, I’m in Jupiter. Maybe I should drive to Lauderdale and we take @jlanka’s boat for a sea trial for him…. To Bimini??
Click to expand...
LOL.. I have a feeling Jeff will make a trip before he decides to head north. If he does he may change his mind and leave it in south Florida
 
ranger58sb said:
I haven't noticed much time delay... maybe below my threshold...

Ref trolling valves: yep, that's generally how they work. The ZFs on our previous boat had an extra oil loop and the trolling valves controlled how much gear oil was routed through that extra loop... in turn, slipping the gears. I dunno yet how our Twin Discs work that, but I'd guess probably similar. I dunno if aftermarket gear oil temp and pressure sensors might be available or not... but since trolling on the Chesapeake is usually at 2-3 kts I might check into something like that if I were to do any serious trolling again (not likely). OTOH, like I said, we used trolling valves extensively, for years, on the previous boat -- without having a clue about temps or pressure.

-Chris
Click to expand...
It's all friction clutches that do the work. There are two clutch packs one for forward and one for reverse. The clutch pack is comprised of discs and plates in which the discs rotate with the engine and the plates rotate with the propshaft. The hydraulic system applies pressure to press the discs and plates together, so they rotate as a unit and thus the engine rotates the propshaft. When in forward gear the hydraulics engage the forward clutch pack and disengage the reverse clutch pack then the opposite occurs when placed in reverse. A super simple concept. The gears in the transmission are always engaged and never disengage. For gears with troll valves the hydraulic fluid is orificed to limit the flow to the clutch packs and consequently limit the force the discs and plates are pressed together and therefore they slip enabling a slower propshaft rotation speed. Obviously then much of that energy is wasted as heat and the gear oil gets hot. So, it is essential to have a robust gear oil cooling system with a troll capability. This bloke does a great job explaining the hardware -
 
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