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Peter_BDA
Joined: 01 Jun 2010
Posts: 87
City/Region: Bermuda
C-Dory Year: 1993
C-Dory Model: 22 Classic
Photos: Luna-Sea
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 Posted: Sun Feb 06, 2011 9:12 am Post subject: Trim Selection-Does size matter?? |
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Hi all, pretty much decided on Bennett M120 "Super Sport" trim tabs for my 22' Cruiser, but I see that there are similar models with different size tabs all around the same price.
Does (tab) size matter? What will work best for the 22'?
All advice welcome!!
Thanks
Peter
Bermuda
PS Yes, it is warmer here than where you are (probably). 
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Peter Aldrich
Bermuda |
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TyBoo
Joined: 23 Oct 2003
Posts: 5328
City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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| Posted: Sun Feb 06, 2011 11:44 am Post subject: |
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You have pretty much decided on the best choice. The M120 tabs might as well have been designed for the CD22.
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TyBoo Mike
Sold: 1996 25' Cruise Ship
Sold: 1987 22' Cruiser |
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centerisland
Joined: 19 Feb 2007
Posts: 336
City/Region: Mercer Island
State or Province: WA
Vessel Name: Lulu
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| Posted: Sun Feb 06, 2011 12:25 pm Post subject: |
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Location matters - the further outboard the better.
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36' Little Harbor Whisperjet - Lulu
44' Custom F/C Trawler - Refugio - SOLD
CD22 - Curlew (ex-SeaDNA) - SOLD by Les! |
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hardee
Joined: 30 Oct 2006
Posts: 12637
City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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| Posted: Sun Feb 06, 2011 12:46 pm Post subject: |
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| Quote: | | "Does size matter?" |
The short answer is ALWAYS, I think.
I have Lenco tabs, and though they do work, I think they are smaller than what would be more efficient. think about it. they are there to provide lift to the stern of the boat. Water passing under the plate, lifts as it moves across the under surface of the tab. The larger the tab the more lift provided given the same speed of the boat. Also, the greater angle of deflection, the more lift. OK, so also, the greater the angle of deflection, the more drag. So, there is the rub. With a larger plate, the angle of deflection required to provide lift will be a less steep angle. And the larger the plate, the more lift for a slower speed.
As a side benefit, a larger plate might serve as an emergency boarding step when climbing into the boat from the stern.
That's my whole $0.02 on trim tab size  
Harvey
SleepyC 
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Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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starcrafttom
Joined: 07 Nov 2003
Posts: 7932
City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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| Posted: Sun Feb 06, 2011 1:09 pm Post subject: |
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yes size matters. I think you need to figure the total square area for each tab (12 x 9=108 sq inches)and get the largerst that will fit.
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Thomas J Elliott
http://tomsfishinggear.blogspot.com/ |
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TyBoo
Joined: 23 Oct 2003
Posts: 5328
City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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| Posted: Sun Feb 06, 2011 4:01 pm Post subject: |
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You will never use 100% of what the M120s will do for the CD22 so they are big enough. And having 120% of what you need is much better than 80%. I think the trouble with the Lencos I have is that they have too little stroke. I believe if you think through all the geometry stuff you'll see that the size vs. angle question isn't that big of a factor. You gotta do what you gotta do so the cost will be the same according to the physics stuff.
Another plus with the Sport Tabs is the turned down edges. It really does help the slow speed tracking around the docks even though you wouldn't think such a simple thing could make a difference. |
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Mighty Bite
Joined: 02 Nov 2003
Posts: 456
City/Region: Fairbanks, Alaska
State or Province: AK
C-Dory Year: 2004
C-Dory Model: 16 Angler
Vessel Name: Mighty Bite
Photos: Mighty Bite
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| Posted: Sun Feb 06, 2011 4:20 pm Post subject: |
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I have the Lenco's and they are a little small size wise and coupled with
the shorter stroke they fall short of the efficiency that the M120's offer.
I put wings on my Lenco's with turned down edges to give more surface
and channel the water. The increase in efficiency was very significant
and I'm very pleased with them now.
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Mark on Mighty Bite |
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TyBoo
Joined: 23 Oct 2003
Posts: 5328
City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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| Posted: Sun Feb 06, 2011 5:52 pm Post subject: |
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OK - I want to take back part of my comments, or at least qualify them by saying I am unqualified to do the geometry/physics analysis. I typed it on my phone at work and now it looks like I think I know what I am talking about.
The point I really want to make is that it should be illegal to put anything but Bennett M120 Sport Tabs on a C-Dory 22 hull. However, others will work just fine. |
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BrentB
Joined: 15 Jul 2006
Posts: 4420
City/Region: Greenwood
State or Province: IN
Photos: BrentB
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| Posted: Sun Feb 06, 2011 6:37 pm Post subject: |
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Bennett tabs has FAQs and other information online at
http://www.bennetttrimtabs.com/
Tom McGow from Bennett is on other forums and is very knowledgeable
Shoot him an email at
info@bennetttrimtabs.com and also ask him to join the C Brats site
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Brent Barrett |
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Mighty Bite
Joined: 02 Nov 2003
Posts: 456
City/Region: Fairbanks, Alaska
State or Province: AK
C-Dory Year: 2004
C-Dory Model: 16 Angler
Vessel Name: Mighty Bite
Photos: Mighty Bite
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| Posted: Sun Feb 06, 2011 6:46 pm Post subject: |
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| No brainer here. Buy the Bennett M120's & eliminate any possibility of buyers remorse. Keep it simple. |
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Tug
Joined: 22 Jun 2007
Posts: 991
City/Region: Sault Ste. Marie
State or Province: ON
C-Dory Year: 1985
C-Dory Model: 22 Angler
Vessel Name: Drifter
Photos: Drifter
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| Posted: Sun Feb 06, 2011 8:00 pm Post subject: |
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| Defenders has Bennett M120's at a very good price. |
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Peter_BDA
Joined: 01 Jun 2010
Posts: 87
City/Region: Bermuda
C-Dory Year: 1993
C-Dory Model: 22 Classic
Photos: Luna-Sea
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| Posted: Sun Feb 06, 2011 8:37 pm Post subject: |
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OK, I'm sold on the Bennett M120's [Add to Cart]
Thanks everyone!
Peter |
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TyBoo
Joined: 23 Oct 2003
Posts: 5328
City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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| Posted: Sun Feb 06, 2011 9:12 pm Post subject: |
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What?? With all the great tab choices you get suckered into these so easy?
Great choice! I put them on my CD22 and really, really wish I had put them on my CD25 instead of the larger Lencos. |
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starcrafttom
Joined: 07 Nov 2003
Posts: 7932
City/Region: marysville
State or Province: WA
C-Dory Year: 1984
C-Dory Model: 27 Cruiser
Vessel Name: to be decided later
Photos: Susan E
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| Posted: Sun Feb 06, 2011 11:44 pm Post subject: |
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I have not been able to find a travel length for the Bennett's anywhere on their web site. I did find that the lencos can be ordered in 2 1/4 or 4 1/2 inch travel lengths. So what is the length of the Bennett's.
I have had the lencos before and cant see any reason not to get them again. They are fast and easy to use. install is easier with out a hydraulic pump to find a place for, You can run the control cables outside the hull and not have to drill a hole in the hull to run the hydraulic lines thru. |
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Yellowstone
Joined: 07 Feb 2006
Posts: 475
City/Region: White Sulphur Springs
State or Province: MT
C-Dory Year: 1999
C-Dory Model: 22 Classic
Vessel Name: Farwest II
Photos: Farwest III
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| Posted: Mon Feb 07, 2011 1:34 am Post subject: |
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Peter - You will find the customer service at Bennetts to be as good as it gets. Just be careful when you drill for your wiring and hydraulic line that you don't drill into the well (outside)l where the contour runs into the transom. You will have to remove your tanks and filler hoses - also based on your model year, your hoses may need replacing. John
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