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Author Topic:   Hydrofoils & Trim tabs
Ready2Rip posted 02-21-2002 01:10 PM ET (US)   Profile for Ready2Rip   Send Email to Ready2Rip  
Is anyone aware of any performance data that has been accumulated for the various hydrofoils on the market? The Doel-fin has been around a long time - I'm wondering if the tiger shark wing or the aluminum plate (can't recall name) model works better.

I'd love to mount trim tabs, but I don't want to give up my swim step.

Thanks in advance,

Mike

Barnett Childress posted 02-21-2002 04:55 PM ET (US)     Profile for Barnett Childress  Send Email to Barnett Childress     
Mike,
Don't know what boat you have, but you don't have to give up your swim step to mount trim tabs. Go to Bennett marine web page and check out installation photos on Edgewater 185C. M80 tabs have shorter actuators. They show a photo where the platform is notched out to allow the top of the actuator to clear. I'm planning something similar for my Montauk w/swim platform as soon as spring comes around.
Barnett
Bigshot posted 02-21-2002 05:07 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I know this is a touchy subject.....but I "personally" feel no need for either tabs or doel-fins on a 17'. I have a 340lb 4 stroke mounted on a 6" jackplate and my hole shot is great and no porpoising. She will blow out before it porpoises.

With that said I believe that some people's porpoising issues are due to engine height or weight distribution. I can keep my Montauk on plane at 15mph...what more can you ask for?

David Ratusnik posted 02-21-2002 05:12 PM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
Ready-- Don't know the size of your boat, but be careful with the shorter cylinders as they may not provide the approx 20 degree travel on your boat. As above, call Bennett before buying. I am told they will swap out proper length cylinder on the SportTabs for your application. They should be able to tell you the proper cylinder length. David
Ready2Rip posted 02-21-2002 09:13 PM ET (US)     Profile for Ready2Rip  Send Email to Ready2Rip     
It's a Revenge 22. It has two coolers for seating that run across the stern, and with 4 passengers it seems like a lot of weight aft. My thought was that a fin would help to give the motor trim a bit more leverage, but I'd rather have trim tabs. The cost & install for trim tabs is a lot pricier than a fin. Just curious what others have found.

Thanks,

Mike

Bigshot posted 02-21-2002 10:02 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Sorry Mike I assumed you had a Montauk. The old assumption issue again.

With that said....definately tabs. I "personally"(again) do not think a doel-fin is very efficient on a hull that heavy...but it "might" do the trick.

Example: I bought a 21 Hydra-sports with a 225 Johnson in 94. It would do an honest 53 and handled great. The problem was she would porpoise do to a "hook" that is in the rear chines. I asked a guy who had the same boat with a 175 and he swore by his doel-fin. I figured if I was not satisfied, I'd just fill-in the holes. It worked great.

Problem: It cured my porpoising issue but also shaved 3mph off the boat...no biggie. The other problem I still have is in a quartering sea I have to turn into the wind slightly to keep her tracking straight. This causes the windward side to tip down and therefore causes a wetter ride. Trim-tabs would cure that with the flick of a switch.

Moral: Trim tabs are God on bigger vessels and in my "personal" opinion necessary. I run them on my 24 Baja and would NEVER give them up. I still however believe they are not necessary on a 17:)

Advice: Put a $25 doel-fin on it and only drill one bolt hole on each fin for the front bolt. If you hate it you only have 2 holes to fill. If you like it, it will rip out before it breaks your anti cavitation plate if you hit anything. It CANT't come off with just one bolt. Try it.

Sorry about the fiction novel here.

13sport posted 02-22-2002 12:27 AM ET (US)     Profile for 13sport    
Bigshot,

First your show intolerance to Gays now you blaspheme.

You had quite a week.

13sport posted 02-22-2002 12:27 AM ET (US)     Profile for 13sport    
:)
Bigshot posted 02-22-2002 10:01 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Nah! That means it has been a good week:)
David Ratusnik posted 02-22-2002 10:48 AM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
Ready- FYI- New Bennett Sport Tabs (10'x12") will set you back about $400. I bought mine online, drop shipped from Bennett within FLA (Total $406). Fit mine to a 86 22' OR. The 10" cord eliminates the problem with the top of the cylinder fitting in an awkward fashion against the vertical transom ridge. With 12"x12 or 12"x 9"s the fit is challenging. As you correctly note, the cost is more than for a hydrofoil. But I think they add value ($) as well as improved performance. Good luck. David
jimp posted 02-22-2002 11:05 AM ET (US)     Profile for jimp  Send Email to jimp     
Mike -

Get the trim tabs, no need for a fin. Since you dive, I can see your need for the swim platform. Find the tabs that can fit with your swim platform. Concur with Bigshot's comments (10:02 PM) on both fin & tabs.

Jim

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