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Old 03-03-2016, 12:38 PM   #21
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Originally Posted by Rebel112r View Post
Dhays. On my 42NP, I have tabs about the same size. So far I have not been able to see that they do anything. In certain conditions I will adjust them to where they should be helping, but have not seen any noticeable change. On my previous boat, they were very helpful. Current boat weighs 35k. They give me a few more square feet to paint and a place to hang zincs. I had thoughts of removing them, but NP recommended I leave them on.
Thanks Rebel, your experience is the most pertinent to this boat, as it is a NP43. I will see what the owner thinks.
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Old 03-03-2016, 12:40 PM   #22
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Dave, if you can adapt to the pace, you will have a blast on a trawler and here's why;

Sailboat: tack, jibe, luff, telltale, furl, mainsheet, clew, leech genoa, in irons, spinnaker....

Trawler; reverse, neutral, forward, sandwich...
Sounds very nice Hawgwash. The most appealing aspect is being able to do it all out of the weather and be able to sip a cup of coffee with that sandwich.
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Old 03-03-2016, 01:30 PM   #23
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Originally Posted by dhays;
Thanks Rebel, your experience is the most pertinent to this boat, as it is a NP43. I will see what the owner thinks.
Looking at YW NP43/42, 4 out of the six have tabs. So, either way, factory or owner installed, must have been a reason for it.
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Old 03-03-2016, 01:54 PM   #24
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Dave,

Having had two boats where trim tabs were almost a necessity, (C-Dory 22 and 25), sometimes the effect of trim tabs are hard to see without a fuel flow meter or very accurate measurement of speed and RPM. Generally speaking in any boat, the most efficient way to push it is with the shaft and prop parallel to the direction the boat is moving. There are many more factors involved but looking at only the prop, anything you can do to make the thrust of the prop more parallel to the direction of travel, the more efficient. At hull speed or less, in an inboard boat, you probably are as close to parallel as you can get. beyond that speed, everything from the wave forming at the bow to the downward thrust of the prop is pushing the bow up (or stern down). At 10 knots if putting trim tabs down, gives you another .2 knots, then the question becomes are they worth the investment. The problem is accurately measuring the .2 knots.

In the C-Dory's I could tell the difference with trim tabs and motor trim at 18-24 knots where proper trim would give you 1 to 2 knots more speed at the same throttle setting. At 12 knots the difference was not as measurable other than once on step you could stay on step down to about 10 knots with everything properly trimmed. I have always wondered what trim tabs would do on the Nordic 42, but I am not at the point to fund a science experiment yet.

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Old 03-03-2016, 02:15 PM   #25
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"The most appealing aspect is being able to do it all out of the weather and be able to sip a cup of coffee with that sandwich."

With your feet up listening to music and the AP doing the steering .
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Old 03-03-2016, 02:18 PM   #26
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Tabs on a trawler are of little or no use.
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Old 03-03-2016, 03:18 PM   #27
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First, rest assured they were used for a reason. At some mix of weight and speed, the boat could benefit from them. I've seen even FD boats that ran at a slightly different angle and speed depending on weight on the boat. For many boats, full water and full fuel can make a significant difference. The ability to adjust for conditions is something I find very worthwhile. You're not just changing the level of the bow either, but adjusting side to side. If you have a load that leaves the boat sitting lower on one side, just trim it. Also, a windy day adjusting the angle at which the waves hit you. You think initially you won't use them much but you find yourself tweaking things with them all the time.
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Old 03-03-2016, 04:05 PM   #28
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Speaking of Thomas' fat sister-in-law... Our new motoryacht is ass-heavy. Tanks and batteries are in the stern. TBH, I think our trim tabs are a little small, but when I get up (or try to get up) on full plane, if I trim the bow down, I can easily pick up 5 or 6 MPH. I am assuming it is pushing her the last little bit over the bow wave to hit full stride.
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Old 03-03-2016, 06:30 PM   #29
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I've noticed that at 6.5 to @8 mph I can give some down tab and pick up a few tenths mph. When going faster than that I got to have the tabs full down to get the bow down and gain a couple of mph. I think the gain at slower speeds would of been more before I added 250' of chain to the original 50' but I had no way to measure speed before adding it, the extra 275# help hold the bow down.


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Old 03-03-2016, 11:11 PM   #30
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I used to think the same thing... but on my Ocean Alexander at 8kts the trim tabs do make a significant difference on angle and view over the bow from the helm.. about a foot of bow drop.

The sweet spot seems to be at about 75% of extension, the boat speed actually comes up as the bow goes down, the boat responds better to helm input and the boat "feels" better.

who would of thought..

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+1. Tabs can be effective a slower speeds. Especially if the are sized correctly.
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Old 03-03-2016, 11:14 PM   #31
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Tabs on a trawler are of little or no use.
Define a "trawler"?

Sorry, I couldn't help myself.
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Old 03-04-2016, 09:04 AM   #32
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+1. Tabs can be effective a slower speeds. Especially if the are sized correctly.
Agree....tabs if large enough will have an effect on any vessel that is trying bury it's stern from increased speed.
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Old 03-04-2016, 09:10 AM   #33
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"bury it's stern from increased speed"

I thought this was a trawler forum.
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Old 03-04-2016, 09:28 AM   #34
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It is all about QBBL......

Even I will agree with that...
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Old 03-04-2016, 10:02 AM   #35
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Hawgwash. The NP's with the standard 230 HP, came with-out tabs. The higher horsepower models, capable of +10 knots, came with the tabs, I think in most cases.
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Old 03-04-2016, 06:39 PM   #36
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Quote:
Originally Posted by dhays
...it is a NP43.
Good luck with the look see, Dave.
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Old 03-04-2016, 07:48 PM   #37
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If it needs trim tabs, or if trim tabs help, it is not a trawler.
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Old 03-04-2016, 07:57 PM   #38
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Manyboats, this is THE trawler forum. Not really neccessary to be a trawler, actually can be an antitrawler and still participate (:
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Old 03-04-2016, 08:38 PM   #39
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It's interesting to note that on Magic, the trim tabs have a marked effect when viewing across the bow at the lower station. The bow visibly drops/rises at hull speed or more. The same effect is not visible from the upper station due to the angle of sight. From the upper station you would swear nothing changed while someone at the lower station will clearly see the change in trim.
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Old 03-04-2016, 08:43 PM   #40
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I just use my tabs to level the boat when needed(side to side)
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