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Author Topic:   Trim Tabs

Tates posted 06-11-2002 09:54 AM ET (US)
Does anyone have Trimtabs on a 25' Revenge with whaler drive , if so where are they located & was performance improved, I have twin 200 hp Merc's.
OutrageMan posted 06-11-2002 04:21 PM ET (US)
I looked at this with my WD 22 Outrage. You can not mount tabs on a WD boat. There is so where on the WD to mount them.
Brian
DCPeters posted 06-11-2002 07:43 PM ET (US)
I have to disagree. I looked at a 23WA two weeks ago that had trim tabs on it; they were factory installed.
i can send you a photo if you like.
Tom W Clark posted 06-11-2002 09:10 PM ET (US)
Whoa there DC! Brian is right. No way to mount trim tabs on a Whaler Drive.
The 23WA was never offered with a Whaler Drive so the boat you refer to doesn't count in this argument. The 23WA had a Salt Shaker bracket which is different than a Whaler Drive. Still a bolt on bracket, mind you, but designed differently.
A 25' Revenge with Whaler Drive will not accept trim tabs, nor should it need them. Tates, why do you feel the need?
DCPeters posted 06-11-2002 11:19 PM ET (US)
Tom, I know "you da man", but here's the technical backup for my statement. Dick was nice enough to send me a 23 WA brochure the other day. You can see the tabs mounted on the hull on both versions of the boat (notched and non-notched/bracket).
There's a photo of a 23 WA "Whaler Drive."
Now it could be that this is just marketing hokum, but how can a novice like me tell the difference when a Whaler drive is a whaler drive or a salt shaker bracket? Is this a difference between generations? They kept the whaler drive name, and they should have had "son or whaler drive"?
I'll mail you the brochure.
I'd be interested in knowing what the difference is; I saw that the edges of the bracket were like swim platforms.
Tates posted 06-11-2002 11:43 PM ET (US)
Thanks to all for the input, I failed to mention I have a 1989 Revenge,In the older version whaler drive there is only a 3" seperation between the two surfaces, making it difficult to locate trim tabs. The wet weight of the boat is 7500Lbs,I tend to think that trim tabs may be more responsive in sloppy conditions,than the power trim on the outboards.I spoke with Bennett Marine they seemed intrested in figuring out a location to place them. Thanks again for all the thoughts.
Tom W Clark posted 06-12-2002 01:13 AM ET (US)
DC,
Thanks for sending me that brochure. You are correct about the use of the term “Whaler Drive” with the 23WA. But it is Reebok using a familiar name to describe their own new boat. The bracket was made by Salt Shaker Marine. It is fundamentally different than the Whaler Drive built by Boston Whaler.
A Whaler Drive is built like a Whaler hull. Two skins are molded and joined, then filled with foam producing a single voluminous shape.
The shape of this Whaler drive is essentially an extension of the hull’s shape. It only sits about 2” higher than the bottom of the hull and thus provides extra running surface for the boat. But it also preempts the installation of conventional trim tabs.
The volume of the Whaler Drive also provides extra buoyancy to help support the extra weight of large twins while at rest or at displacement speeds. The down side of all this is that the extra running surface contributes extra drag as well.
On the other hand, the Salt Shaker bracket is much closer to what we think of as a motor bracket. It runs clear of the water’s surface and does not contribute any drag while the boat is on plane. This may allow a faster top speed. I think lhg would agree with this.
There’s also room under there for trim tabs, which may be needed since there isn’t that extra running surface.
I’m not sure but the Salt Shaker bracket may weight less than the Whaler Drive too.
The Whaler drive is solid with no voids inside unless added later. The only things running inside of them are the enormous mounting bolts attaching it to the hull.The Salt Shaker bracket is much more mechanically integrated into the hull with passages running into the hull below the waterline for hoses & cables.
I believe all the Van Lancker designed Whalers built during Reebok’s ownership got these Salt Shaker Marine brackets if they got anything. The Whaler Drive was still made for the Classic hulls at least until the end of the 1980’s . Some Classic hulls like the 25WA and the 27WA were also fitted with Salt Shaker brackets in the 1990’s
To tell the difference between the two, look at two things:
1) The shape of the corner. The Whaler drive will be rounded, the Salt Shaker bracket is more square.
2) The Whaler Drive fills almost all the space behind the transom. The Salt Shaker bracket leaves room for trim tabs.

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Author	Topic: Trim Tabs
Tates	posted 06-11-2002 09:54 AM ET (US) Does anyone have Trimtabs on a 25' Revenge with whaler drive , if so where are they located & was performance improved, I have twin 200 hp Merc's.
OutrageMan	posted 06-11-2002 04:21 PM ET (US) I looked at this with my WD 22 Outrage. You can not mount tabs on a WD boat. There is so where on the WD to mount them. Brian
DCPeters	posted 06-11-2002 07:43 PM ET (US) I have to disagree. I looked at a 23WA two weeks ago that had trim tabs on it; they were factory installed. i can send you a photo if you like.
Tom W Clark	posted 06-11-2002 09:10 PM ET (US) Whoa there DC! Brian is right. No way to mount trim tabs on a Whaler Drive. The 23WA was never offered with a Whaler Drive so the boat you refer to doesn't count in this argument. The 23WA had a Salt Shaker bracket which is different than a Whaler Drive. Still a bolt on bracket, mind you, but designed differently. A 25' Revenge with Whaler Drive will not accept trim tabs, nor should it need them. Tates, why do you feel the need?
DCPeters	posted 06-11-2002 11:19 PM ET (US) Tom, I know "you da man", but here's the technical backup for my statement. Dick was nice enough to send me a 23 WA brochure the other day. You can see the tabs mounted on the hull on both versions of the boat (notched and non-notched/bracket). There's a photo of a 23 WA "Whaler Drive." Now it could be that this is just marketing hokum, but how can a novice like me tell the difference when a Whaler drive is a whaler drive or a salt shaker bracket? Is this a difference between generations? They kept the whaler drive name, and they should have had "son or whaler drive"? I'll mail you the brochure. I'd be interested in knowing what the difference is; I saw that the edges of the bracket were like swim platforms.
Tates	posted 06-11-2002 11:43 PM ET (US) Thanks to all for the input, I failed to mention I have a 1989 Revenge,In the older version whaler drive there is only a 3" seperation between the two surfaces, making it difficult to locate trim tabs. The wet weight of the boat is 7500Lbs,I tend to think that trim tabs may be more responsive in sloppy conditions,than the power trim on the outboards.I spoke with Bennett Marine they seemed intrested in figuring out a location to place them. Thanks again for all the thoughts.
Tom W Clark	posted 06-12-2002 01:13 AM ET (US) DC, Thanks for sending me that brochure. You are correct about the use of the term “Whaler Drive” with the 23WA. But it is Reebok using a familiar name to describe their own new boat. The bracket was made by Salt Shaker Marine. It is fundamentally different than the Whaler Drive built by Boston Whaler. A Whaler Drive is built like a Whaler hull. Two skins are molded and joined, then filled with foam producing a single voluminous shape. The shape of this Whaler drive is essentially an extension of the hull’s shape. It only sits about 2” higher than the bottom of the hull and thus provides extra running surface for the boat. But it also preempts the installation of conventional trim tabs. The volume of the Whaler Drive also provides extra buoyancy to help support the extra weight of large twins while at rest or at displacement speeds. The down side of all this is that the extra running surface contributes extra drag as well. On the other hand, the Salt Shaker bracket is much closer to what we think of as a motor bracket. It runs clear of the water’s surface and does not contribute any drag while the boat is on plane. This may allow a faster top speed. I think lhg would agree with this. There’s also room under there for trim tabs, which may be needed since there isn’t that extra running surface. I’m not sure but the Salt Shaker bracket may weight less than the Whaler Drive too. The Whaler drive is solid with no voids inside unless added later. The only things running inside of them are the enormous mounting bolts attaching it to the hull.The Salt Shaker bracket is much more mechanically integrated into the hull with passages running into the hull below the waterline for hoses & cables. I believe all the Van Lancker designed Whalers built during Reebok’s ownership got these Salt Shaker Marine brackets if they got anything. The Whaler Drive was still made for the Classic hulls at least until the end of the 1980’s . Some Classic hulls like the 25WA and the 27WA were also fitted with Salt Shaker brackets in the 1990’s To tell the difference between the two, look at two things: 1) The shape of the corner. The Whaler drive will be rounded, the Salt Shaker bracket is more square. 2) The Whaler Drive fills almost all the space behind the transom. The Salt Shaker bracket leaves room for trim tabs.