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Old 05-28-2014, 11:36 AM   #141
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Bob,

Now those are some VERY easily driven hulls.
Especially the little guy on the left. I see her propeller is quite far aft.
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Old 05-28-2014, 12:23 PM   #142
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Getting ready to splash!
Very nice vessel indeed, congrats.
By chance, do you know if l/h props are standard on all single screw Nordhavns?
I've seen both l/h and r/h props used for single engine trawlers, but I never really understood whether there's any efficiency difference in having the gearbox spinning in same direction of the engine (as in l/h prop), or the other way round.
With apologies for the o/t...
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Old 05-28-2014, 12:33 PM   #143
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Depends on the tranny. Modern trannies can take full power in either lh and rh output, but most are slightly more efficient in rh. One gearset in play for rh fwd, two gearsets in play for lh fwd.

I heard one comment where boatbuilders get a discount buying props in pairs, then one boat gets the lh, next one gets the rh. I'm not quite cynical enough to believe that completely, though.
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Old 05-28-2014, 12:41 PM   #144
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most are slightly more efficient in rh. One gearset in play for rh fwd, two gearsets in play for lh fwd.
Yup, that has always been my reasoning too.
Hence my question, because you would expect, on a boat meant for very long distance cruising, that the builder should go for the most efficient alternative, no matter how tiny the difference, unless there are other reasons which I'm missing...
...like the one you mention re. buying props in pairs, but that sounds believable only for much smaller, mass production props, I would think.
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Old 05-28-2014, 01:00 PM   #145
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Many trawlers with single engines come with left hand screws. Since most steering is on the starboard side because that is the "danger zone". and many lower stations have doors adjacent it makes sense to have a boat that backs to starboard for easier docking.

Most Nordhavns are an exception as most have their steering on the centerline with doors on either side of the PH. RH or LH wheel would just be a matter of preference.
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Old 05-28-2014, 01:20 PM   #146
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Actually, most Nordhavns are set up for starboard-side tie up, mostly because that's the only side you can walk around (the Salon is full width on the port side). There probably are a few exceptions, but in general it's the case. With a Starboard side tie, you want the reverse prop walk to pull you to starboard, hence a left hand rotation for normal propulsion.

To whatever extend there are port-side boarding gates, it's likely because the original buyer requested it. That's certainly the case on mine. I added a port-side gate off the bridge and a port-side wing station. Both were very economical to add at build time.

One interesting thing with Nordhavns, and probably a lot of other semi-custom boats, is that each one you see is 90% Nordhavn, and 10% the owner who built it. No two are the same, and I'll bet most include options/changes that are not on the normal options list. Everyone wants something different, which of course significantly complicates things for the builder, but that's the business they are in.
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Old 05-28-2014, 01:21 PM   #147
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Old 05-28-2014, 01:34 PM   #148
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No two are the same, and I'll bet most include options/changes that are not on the normal options list.
Yes, I'm aware of that, but while this explains all those choices which you mentioned, I'm skeptic that many buyers are asking for a specific prop rotation - that's why I was wondering if the yard has any preference (if not really a "standard"), and why.
Btw, in these days of very powerful hydraulic bow and stern thrusters, I don't think the prop walk is a big consideration....
...though I didn't actually see a thruster on your stern, is it still to be fitted maybe?
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Old 05-28-2014, 01:35 PM   #149
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On my light planing hull boat, the stbd side is a bit heavier than port, slightly more so with helmsman behind the wheel. If I have 40gal extra fuel in port tank, boat sits exactly level. Prop torque with RH wheel tends to lift stbd side, so that helps trim when running. Splitting hairs there, I know... And at trawler speed it makes no difference.

My dock is a portside tie, and that left prop walk is handy there. But I fully understand it being a PITA on a stbd tie. I really have to work it to do a stbd tie if wind/current are not favorable.
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Old 05-28-2014, 02:06 PM   #150
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Having great visibility from bridge and helm in center (I almost always pilot from bridge)... with twin screws... docking on either side of boat is EZ.
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Old 05-28-2014, 02:08 PM   #151
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Having great visibility from bridge and helm in center (I almost always pilot from bridge)... with twin screws... docking on either side of boat is EZ.
Art, if you had a Rocna life would be perfect.
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Old 05-28-2014, 02:18 PM   #152
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Art, if you had a Rocna life would be perfect.
Don - Life IS Perfect! Well... pretty much anyway - LOL... And, as I can tell you know just about better than anyone, boating sure helps make it that way!!
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Old 05-28-2014, 02:19 PM   #153
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The bottom of "Rhino"....
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Old 05-28-2014, 04:13 PM   #154
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Yes, I'm aware of that, but while this explains all those choices which you mentioned, I'm skeptic that many buyers are asking for a specific prop rotation - that's why I was wondering if the yard has any preference (if not really a "standard"), and why.
Btw, in these days of very powerful hydraulic bow and stern thrusters, I don't think the prop walk is a big consideration....
...though I didn't actually see a thruster on your stern, is it still to be fitted maybe?
I see you were asking a different question. I expect all these props are made to order and that builders just order what they need. Building alternate boats with opposite rotation sounds like a wives tail to me, but I really don't know.

Yes, there is a stern thruster. It's integral to the hull with an arched tube. Is one of the earlier pictures you can see the whole in the bottom of the boat, and someone commented on it.
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Old 05-28-2014, 04:47 PM   #155
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Dimmer 2,
That's a nice soft chine and it looks like you've got a lot of blade area w the prop. Must have a lot of power and speed. Can you dazzle us w numbers?

Or pics at speed?
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Old 05-28-2014, 05:14 PM   #156
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Dimmer 2,
That's a nice soft chine and it looks like you've got a lot of blade area w the prop. Must have a lot of power and speed. Can you dazzle us w numbers?

Or pics at speed?
I think you may be disappointed Eric. While she has 285 HP, she cruises best at 8.5 - 9 kts (1450 rpm) burning 4 gph. More rpm makes very little difference in speed but lots of difference in fuel burn, even though she is technically SD. The picture is at cruise speed.
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Old 05-28-2014, 06:39 PM   #157
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Yes, there is a stern thruster. It's integral to the hull with an arched tube. Is one of the earlier pictures you can see the whole in the bottom of the boat, and someone commented on it.
Ops, yeah, now I see the hole on port side, in the last pic you posted.
Is it as effective as traditional external stern thrusters?
Also, it looks pretty close to the rudder shaft, doesn't that affect accessibility for maintenance?
Sorry for being yet again o/t, but I couldn't find a more specific thread on your new small ship...
Is there one somewhere, which I'm missing?
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Old 05-28-2014, 11:54 PM   #158
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dimmer2,
Rihno has the kind of profile I really like. long and low. But not narrow. My favorite kind of FB. A built down LB she looks like. Looks like she's rather heavy too and not making much of a fuss sliding along. With all that beam and low profile you must feel very secure in rough seas. The rudder looks large and is close to the hull so should be very effective. How long and wide is she?
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Old 05-29-2014, 12:54 AM   #159
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Eric, she is 46 ft at the WL with a 15 1/2 ft beam, weighing in at 34,000 lbs, drafts 3 1/2. She steers well but gets to rolling pretty good if you let her. Overall, very happy with her.
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Old 05-29-2014, 01:10 AM   #160
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Badger's stern, yet Humpback friendly arse end in Douglas Channel on BC's north coast;
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