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RB

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Since: Jul 25, 2004
Posts: 98



(Msg. 1) Posted: Fri Mar 26, 2004 12:22 am
Post subject: trim tab vane setting
Archived from groups: rec>boats (more info?)
'77 Johnson 115hp.

How do I set the trim tab vane on the lower unit?
It's easy to physically loosen, set, and tighten. However, what I'm asking
is where to set it, how to know if it's the right setting, etc. I seem to
remember it's some kind of trial and error thing, but I don't know what to
look for. Please give me a quick crash course in the care and feeding of
that thingee.

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Joe4

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Since: Jan 01, 2004
Posts: 88



(Msg. 2) Posted: Fri Mar 26, 2004 7:30 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
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"RB" <rbig.DeleteThis@bellsouth.nospam.net> wrote in message
news:rlN8c.144835$rB4.77462@bignews6.bellsouth.net...
 > '77 Johnson 115hp.
 >
 > How do I set the trim tab vane on the lower unit?
 > It's easy to physically loosen, set, and tighten. However, what I'm asking
 > is where to set it, how to know if it's the right setting, etc. I seem to
 > remember it's some kind of trial and error thing, but I don't know what to
 > look for. Please give me a quick crash course in the care and feeding of
 > that thingee.
 >
 >

Just center the torque tab and run at cruising speed to see which way the
boat wants to track.

If it tracks to the port side adjust it in small increments counter
clockwise (looking from above) until the boat tracks straight (or clockwise
if it wants to track towards starboard). Make sure you adjust in small
increments, it usually doesn't take much.<!-- ~MESSAGE_AFTER~ -->

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RichG1

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Since: Mar 23, 2004
Posts: 64



(Msg. 3) Posted: Fri Mar 26, 2004 7:32 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
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On mine ( which was an outboard - but the same changes are necessary)...My
boat ran to the starboard (right) when idling along. I moved the trim tab so
that it pointed to the left (port) to correct the right-handed drift. I
thought of it as a sailboat's rudder. Opposites work.
--
RichG
<a style='text-decoration: underline;' href="http://groups.msn.com/CarolinaSkiffOwners" target="_blank">http://groups.msn.com/CarolinaSkiffOwners</a>
"RB" <rbig.TakeThisOut@bellsouth.nospam.net> wrote in message
news:rlN8c.144835$rB4.77462@bignews6.bellsouth.net...
 > '77 Johnson 115hp.
 >
 > How do I set the trim tab vane on the lower unit?
 > It's easy to physically loosen, set, and tighten. However, what I'm asking
 > is where to set it, how to know if it's the right setting, etc. I seem to
 > remember it's some kind of trial and error thing, but I don't know what to
 > look for. Please give me a quick crash course in the care and feeding of
 > that thingee.
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: trim tab vane setting 
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RB

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Since: Jul 25, 2004
Posts: 98



(Msg. 4) Posted: Fri Mar 26, 2004 7:32 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
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Charles T. Low1

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Since: Jun 13, 2004
Posts: 107



(Msg. 5) Posted: Sat Mar 27, 2004 12:39 pm
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
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It's possible I need another coffee, but I think the two answers from Joe
and RichG are actually incorrect. I'll try not to screw this up, but here's
what I think I know.

1/ The tab isn't for low speed use, it's for planing speeds.
2/ You move it the "wrong" way to make it do the right thing. The reason
for this is that it steers the outdrive, not the whole boat. So, if your
boat, on plane, steers to port, you want it to steer more to starboard (to
go straight), so that means the outdrive has to turn to starboard, but that
means the front of the outdrive is now aiming more to port (because you push
the stern to port to turn the boat to starboard...), so to use to the little
trim tab "rudder" to steer the outdrive that way, and because that little
"rudder" steers the "stern" of the outdrive the same as a big rudder steers
the stern of a boat, the trim tab's trailing edge is turned to port to make
the outdrive aim more towards port (which we call turning the outdrive to
starboard).

There, that wasn't so hard. A few points:

Turning the outdrive to port would be clockwise, from above. That's the
opposite of what Joe said. (Awfully sorry, and I hope I'm getting this
right.)

If your boat turns to port, turning the trim tab to port initially looks
wrong. That's because, as said, it's to turn to the outdrive, not the whole
boat.

Turning the trim tab to port is actually making it aim to starboard, but the
nomenclature of rudder usage dictates that we use the side towards which we
swing the trailing edge. (Dontcha' just love this?)

====

Charles T. Low
ctlow5 RemoveThis @boatUNdocking.com - remove "UN"
<a style='text-decoration: underline;' href="http://www.boatdocking.com/BDPhoto.html" target="_blank">www.boatdocking.com/BDPhoto.html</a> - Photo Contest
<a style='text-decoration: underline;' href="http://www.boatdocking.com" target="_blank">www.boatdocking.com</a>
<a style='text-decoration: underline;' href="http://www.ctlow.ca/Trojan26" target="_blank">www.ctlow.ca/Trojan26</a> - my boat

====

"RB" <rbig RemoveThis @bellsouth.nospam.net> wrote in message
news:rlN8c.144835$rB4.77462@bignews6.bellsouth.net...
 > '77 Johnson 115hp.
 >
 > How do I set the trim tab vane on the lower unit?
 > It's easy to physically loosen, set, and tighten. However, what I'm asking
 > is where to set it, how to know if it's the right setting, etc. I seem to
 > remember it's some kind of trial and error thing, but I don't know what to
 > look for. Please give me a quick crash course in the care and feeding of
 > that thingee.
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: trim tab vane setting 
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Joe4

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Since: Jan 01, 2004
Posts: 88



(Msg. 6) Posted: Sat Mar 27, 2004 6:34 pm
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Charles T. Low" <ctlow5.TakeThisOut@boatUNdocking.com> wrote in message
news:omg9c.78199$0T2.1735537@weber.videotron.net...
 > It's possible I need another coffee, but I think the two answers from Joe
 > and RichG are actually incorrect. I'll try not to screw this up, but
here's
 > what I think I know.

Nope, I think we're saying the same thing (you and I).
If the boat tracks to port, you turn the tab counter-clockwise (looking from
above) to compensate.
Turning counter-clockwise turns the tab towards port.<!-- ~MESSAGE_AFTER~ -->
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RichG1

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Since: Mar 23, 2004
Posts: 64



(Msg. 7) Posted: Sun Mar 28, 2004 12:42 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
If I explained the "fix" incorrectly, then I apologize, ...........but
......Joe's clarification seems to agree exactly with my rudder analogy.

All I can say for sure...is that the "opposites" method fixed my running to
starboard problem!

If you are running to Starboard,..and want to go to Port..(actually back to
neutral), you "point" the fin to starboard..and vice versa...
--
RichG
http://groups.msn.com/CarolinaSkiffOwners
"
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RichG1

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Since: Mar 23, 2004
Posts: 64



(Msg. 8) Posted: Sun Mar 28, 2004 12:48 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Ah... haaa! After re-reading my OWN explanation...I can see why I probably
confused some people.

It is my use of the word "opposite".

I think we are all saying the same thing, but using different words (with
mine perhaps the most unclear).... sorry.

I guess it comes from sailing with a tiller for so many years.
--
RichG
http://groups.msn.com/CarolinaSkiffOwners
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Charles T. Low1

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Since: Jun 13, 2004
Posts: 107



(Msg. 9) Posted: Sun Mar 28, 2004 1:25 pm
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I accept that I did indeed need another coffee before my reply yesterday.
And at one point I said "outdrive" when I meant "trim tab," for example.

So, everyone agree on this? Boat pulls to port. Want to have it self-steer
more to starboard (to go "straight"). Require swinging (trailing edge of)
outdrive to starboard. That requires turning trailing edge of trim tab to
port. That is _clockwise_ when viewed from above - I am going to be stubborn
about that. Would a schematic help?

Charles

====

Charles T. Low
ctlow5 DeleteThis @boatUNdocking.com - remove "UN"
www.boatdocking.com/BDPhoto.html - Photo Contest
www.boatdocking.com
www.ctlow.ca/Trojan26 - my boat

====
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RichG1

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Since: Mar 23, 2004
Posts: 64



(Msg. 10) Posted: Sun Mar 28, 2004 9:21 pm
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
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Nah..no schematic needed here.

Boat goes to Port...
You want it to go straight..
Point the tab to Port.
OK here.
--
RichG
<a style='text-decoration: underline;' href="http://groups.msn.com/CarolinaSkiffOwners" target="_blank">http://groups.msn.com/CarolinaSkiffOwners</a>
"Charles T. Low" <ctlow5 DeleteThis @boatUNdocking.com> wrote in message
news:M7C9c.2097$sM4.119634@wagner.videotron.net...
 > I accept that I did indeed need another coffee before my reply yesterday.
 > And at one point I said "outdrive" when I meant "trim tab," for example.
 >
 > So, everyone agree on this? Boat pulls to port. Want to have it self-steer
 > more to starboard (to go "straight"). Require swinging (trailing edge of)
 > outdrive to starboard. That requires turning trailing edge of trim tab to
 > port. That is _clockwise_ when viewed from above - I am going to be
stubborn
 > about that. Would a schematic help?
 >
 > Charles
 >
 > ====
 >
 > Charles T. Low
 > ctlow5 DeleteThis @boatUNdocking.com - remove "UN"
 > <a style='text-decoration: underline;' href="http://www.boatdocking.com/BDPhoto.html" target="_blank">www.boatdocking.com/BDPhoto.html</a> - Photo Contest
<font color=purple> > <a style='text-decoration: underline;' href="http://www.boatdocking.com</font" target="_blank">www.boatdocking.com</font</a>>
 > <a style='text-decoration: underline;' href="http://www.ctlow.ca/Trojan26" target="_blank">www.ctlow.ca/Trojan26</a> - my boat
 >
 > ====
 >
 ><!-- ~MESSAGE_AFTER~ -->
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Joe4

External


Since: Jan 01, 2004
Posts: 88



(Msg. 11) Posted: Mon Mar 29, 2004 6:29 pm
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Charles T. Low" <ctlow5.RemoveThis@boatUNdocking.com> wrote in message
news:M7C9c.2097$sM4.119634@wagner.videotron.net...
 > That is _clockwise_ when viewed from above - I am going to be stubborn
 > about that. Would a schematic help?
 >
 > Charles
 >

My brain is starting hurt.
I think you are correct and I have it exactly backwards.
I'll be going out sometime this week and I'll try it out on my boat.<!-- ~MESSAGE_AFTER~ -->
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Charles T. Low1

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Since: Jun 13, 2004
Posts: 107



(Msg. 12) Posted: Wed Mar 31, 2004 1:44 am
Post subject: Re: trim tab vane setting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
RichG,

I think we agree. By "point the trim tab to Port," you mean the trailing
edge, which is the way I describe it too.

====

Charles T. Low
ctlow5 RemoveThis @boatUNdocking.com - remove "UN"
<a style='text-decoration: underline;' href="http://www.boatdocking.com/BDPhoto.html" target="_blank">www.boatdocking.com/BDPhoto.html</a> - Photo Contest
<a style='text-decoration: underline;' href="http://www.boatdocking.com" target="_blank">www.boatdocking.com</a>
<a style='text-decoration: underline;' href="http://www.ctlow.ca/Trojan26" target="_blank">www.ctlow.ca/Trojan26</a> - my boat

====

"RichG" <rich99sue RemoveThis @sbcxxxglobal.net> wrote in message
news:CIE9c.2812$qQ4.2572@newssvr24.news.prodigy.com...
 > Nah..no schematic needed here.
 >
 > Boat goes to Port...
 > You want it to go straight..
 > Point the tab to Port.
 > OK here.
 > --
 > RichG<!-- ~MESSAGE_AFTER~ -->
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