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ComputerJoe
#1 Posted : Wednesday, October 07, 2009 7:30:40 AM(UTC)
ComputerJoe

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Doc, I just acquired a set of Bennett trim tabs and was looking at your pictures of you anti-fouling paint test. You mounted the tabs to the trailing edge of the welded tabs we have that stick out 4".

How did you account for that extra 4" and the travel of the cylinders? It looks like you may have moved the cylinder mount on the tab forward to the middle of the tab instead of on the trailing edge where they want to be. Please share a little of your vast expirence with us.

Thanks
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Docsnow
#2 Posted : Wednesday, October 07, 2009 9:27:18 AM(UTC)
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C J,

Can’t take credit for the trim tabs mounting that’s the way they where when I bought the OTM so I’m not sure if that’s manufacture spec. or if previous owner altered them never paid to much attention other than when I’d remove the anodes for cleaning. there are only one set of holes on the tabs that the cylinder mounts to the tab. Here’s about the best pix that I have of the trim tabs HTHs Whistle
File Attachment(s):
swim platform 016.jpg (232kb) downloaded 182 time(s).
swim platform 014.jpg (231kb) downloaded 181 time(s).
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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ComputerJoe
#3 Posted : Wednesday, October 07, 2009 11:09:49 AM(UTC)
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When you visit your girl try and measure the length of those cylinders. Mine are about 13" long overall.
I just thought that I might have to block the transom end or make a bracket for the tabs to account for the extra 4" of welded tab. I was very happy to see it might work without mods.

Thanks
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Docsnow
#5 Posted : Wednesday, October 07, 2009 11:32:46 AM(UTC)
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C J

May be able to do better than that, my buddy is still up there I think if he is I’ll have him measure
the T/Ts cylinder Whistle

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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DiverDennis
#6 Posted : Wednesday, October 07, 2009 12:12:25 PM(UTC)
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ComputerJoe wrote:
...It looks like you may have moved the cylinder mount on the tab forward to the middle of the tab instead of on the trailing edge where they want to be...
I found a picture that might help. I could take some measurements of the actuators and tabs on SI.
See also: http://www.bennetttrimta...rimtab_installation.pdf and http://s277.photobucket....LATFORM-KICKER-THRUSTER/
DiverDennis attached the following image(s):
DiverDennis attached the following image(s): flapper and tab cropped.jpg
Surface Interval
1975 28' Express, Single M360
Specs: http://www.boatm8.com/my...amp;page=boats&arr=0
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Jazman
#7 Posted : Thursday, October 08, 2009 2:53:43 AM(UTC)
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The Tabs on my 1975 37' are the same as Doc's. I BELEIVE its all original. The cylinders are just standard Bennetts. They are mounted without blocks on the transom and about centered on the tab itself.
Bill

1975 37' FB Sedan
Sleepless Knights
Bohemia River
Chesapeake City, MD
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Roger2
#8 Posted : Thursday, October 08, 2009 5:25:51 AM(UTC)
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My 37 BigM double cabin has I think the same trim tabs but with 2 cylinders on each tab.

Roger
Sea Jay
1983 37 double cabin, twin 230hp Volvo diesels, twin disk 1.5-1 20X 23 4 blade props
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ComputerJoe
#9 Posted : Thursday, October 08, 2009 9:12:06 AM(UTC)
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THANK YOU all,
Moving the mount on the tab forward is what I thought I would have to do BUT that will put more torque on the cylinder, AND I was worried that the tab may bend up aft of the cylinder mount. But since a couple or three of you have been running this way I will forge boldly ahead.

Thanks again
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jralbert
#10 Posted : Thursday, October 08, 2009 9:38:02 AM(UTC)
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Norm's first pic looks zackly like my tab installation. '88 32' FBS
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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Docsnow
#4 Posted : Thursday, October 08, 2009 10:45:25 PM(UTC)
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ComputerJoe wrote:
When you visit your girl try and measure the length of those cylinders.


C J,

My buddy finally got back at me with the measurements of the cylinder they 13" overall & the
housing is 8 3/4" HTH

Norm,

Big BigMs Live On Applause
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


 You'll have bad times, but they'll just wake you up to the good times you weren't paying attention to

Some people try to turn back their odometers.Not me, I want people to know "why" I look this way.I've traveled a long way and some of the roads weren't paved.
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ComputerJoe
#11 Posted : Thursday, October 08, 2009 11:18:09 PM(UTC)
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Yahoo!
Them's is my dimentions.

Now why move the annodes to the SS trim tabs? Why not just leave them on top of the welded tabs on top of the SS hinge plates? The hull is what we are trying to protect and reducing the hulls physical connection to the anodes by placing them out on a hinged SS plate seems counter to the goal.
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fastjeff
#12 Posted : Friday, October 09, 2009 1:35:53 AM(UTC)
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Good point, but that's how they were done. And it seems to work.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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