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Old 03-23-2017, 02:40 PM   #101
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I have trouble going below about 6 kts at idle of about 800. No trolling valves. Cummins idle specs are 750-900 and anything below about 775 gets rough. I just just bump in and out of gear as required. PITA, but I'm getting used to it. I don't know what I would do if I had to operate regularly in extended no-wake zones though. Change prop$ . . . .
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Old 03-23-2017, 02:41 PM   #102
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]And the Dismal and the....etc...etc...etc...

Just some have never operated these type vessels and have nothing going to use as examples.

Some crew boats are so ridiculously overpowered and with the huge props can be a handful in idle with both engines in gear in slow speed areas....really fun when you can run them to their potential.
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Old 03-23-2017, 02:54 PM   #103
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If, mah distinguished colleagues, by twins you are referring to the safety and maneuvering factors that protect our wives and children, provide for a better nights sleep, and cause an older gentleman to feel secure, then by all means I'm for them. But, if by twins you mean the diesel/gas guzzling, double every expense, knuckle busting repairs, and all things evil , then I am firmly against them - that is mah stand, and I stand firm :-)
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Old 03-23-2017, 03:15 PM   #104
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I have trouble going below about 6 kts at idle of about 800. No trolling valves. Cummins idle specs are 750-900 and anything below about 775 gets rough. I just just bump in and out of gear as required. PITA, but I'm getting used to it. I don't know what I would do if I had to operate regularly in extended no-wake zones though. Change prop$ . . . .
We can do no wake zones with no problem. It's the 4.3 knot speed limit at sections of the canal where we did just as you describe.
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Old 03-23-2017, 09:16 PM   #105
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FWIW... most no wake zones are "minimal" wake and for most boats, 5 knots is fine...and some can go faster with minimal wake depending on hull design. It's wake, not speed.

As for the benefit of twins this will be argued forever without a solution. Mostly opinion and rarely fact.

The only thing that's fact is that the twins are more maneuverable, however, not significant. Even the argument that twins cost a lot more is just not true.
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Old 03-23-2017, 09:43 PM   #106
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If you're over propped you'll never be able to go slow in the harbor.
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Old 03-23-2017, 10:28 PM   #107
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FWIW... most no wake zones are "minimal" wake and for most boats, 5 knots is fine...and some can go faster with minimal wake depending on hull design. It's wake, not speed.

As for the benefit of twins this will be argued forever without a solution. Mostly opinion and rarely fact.

The only thing that's fact is that the twins are more maneuverable, however, not significant. Even the argument that twins cost a lot more is just not true.
Erie Canal is speeds though, nothing to do with wakes.

Florida has two type of wake zones.

Idle Speed-No Wake. The minimum speed necessary to maintain steerage. No wake expected.

Slow Speed-Minimum Wake. Very small wake. Bow can not be even slightly elevated.

Florida also has 25 mph, 30 mph, and 35 mph speed zones.
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Old 03-24-2017, 05:56 AM   #108
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"If you're over propped you'll never be able to go slow in the harbor."

Many transmissions are now fitted with a neutral position.
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Old 03-24-2017, 07:23 AM   #109
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Many transmissions are now fitted with a neutral position.
Aren't they all..?
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Old 03-24-2017, 08:01 AM   #110
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"If you're over propped you'll never be able to go slow in the harbor."

Many transmissions are now fitted with a neutral position.


That was just so amusing this morning!
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Old 03-24-2017, 09:39 AM   #111
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Quote:
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"If you're over propped you'll never be able to go slow in the harbor."

Many transmissions are now fitted with a neutral position.
Opps,
May have deserved that to some degree. I promised Fred I was'nt going to argue w him about overpropping.
This is kind-of a side issue. And frequently shifting in and out of gear won't hurt the clutches or gears .. that I know of. So Fred's comment is not only justified but correct.
I mention it as a downside as others have complained about it in the past.

Larry,
Looks like you've found RT's bag of tricks.
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Old 03-24-2017, 01:43 PM   #112
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Aren't they all..?
A few, not many, are only a "in or out" clutch, not a true
marine transmission.

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Old 03-24-2017, 02:31 PM   #113
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Nice to see you Ted,
Perhaps I spoke too soon. Cone clutches may be problematic w heavy concentrated use. I don't think any clutches are allergic to lots of use as long as people shift and get it over with. And do it at low speed.
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Old 03-24-2017, 04:29 PM   #114
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Hi Eric,

I don't know if they are cone clutches or multiple plates held together
under pressure, or if I'm describing and naming the same thing.

The one I had was a power-takeoff unit on a DD3-53 driving a
freezer unit. I think it may have been a Rockford? Manual lever to
engage.

The relevent ones I have seen are on the aft end of a pair of
DD6-71 s , again manual lever to engage.

I would think it should be possible to arrange a remote method
to shift these in or out of action.

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Old 03-24-2017, 05:26 PM   #115
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No matter which you pick, you'll eventually wish you had the other when:

with a single, your engine fails

or

with a twin, you foul your running gear on an underwater obstruction.

To me, the perfect world would be twins with full prop protection (bilge keels), but I suffer on through my boating life with a less-than-perfect boat. Woe is me...
Agreed!

Also, Don't forget regarding human capabilities and mechanisms: Redundancy is what we [our bodies] are made of for propulsion, handling and seeing where we're going. I.e. - Two legs with feet. Two arms with hands. And two eyes to see where our feet can take us with hands to make sure we get there. Just saying!
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Old 03-24-2017, 05:44 PM   #116
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Agreed!

Also, Don't forget regarding human capabilities and mechanisms: Redundancy is what we [our bodies] are made of for propulsion, handling and seeing where we're going. I.e. - Two legs with feet. Two arms with hands. And two eyes to see where our feet can take us with hands to make sure we get there. Just saying!
And two kidneys, two lungs, two ovaries, two testicles, and yet some folks have 1/2 a brain. Weird.
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Old 03-24-2017, 06:01 PM   #117
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One heart, one brain....

And one colon...and we all know who rules when the colon doesnt work.....

So I guess like the human body, maybe the Butts on here rule.....
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Old 03-24-2017, 06:31 PM   #118
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Old 03-24-2017, 06:47 PM   #119
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As a pilot, I learned to live by and love redundancy after many years operating single engine airplanes. Both have their place, but given the chance, a twin is my choice.

In fact, I enjoy redundancy in significant capabilities on my boat that make a difference to me besides propulsion. Lighting, heat, ventilation, coffee-making, refrigeration, entertainment, Wifi, and navigation to name a few that immediately come to mind. For others, I try to carry a spare part that may make a difference someday.

Knowing this crowd, I'm betting there are many boats here that can say the same. Gotta love redundancy...
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Old 03-24-2017, 08:36 PM   #120
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I've learned the hard way to have a second pair of shoes, especially at boat shows.
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