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Author Topic:   190 MONTAUK: Hydrofoil Fins
John6789 posted 04-19-2009 10:11 AM ET (US)   Profile for John6789   Send Email to John6789  
[Seeks] experience and suggestions for hydrofoil fins for a [Boston Whaler 190 MONTAUK] with a Mercury 115-HP FOURSTROKE. Which model fins? Does the no-drill mounting system work well and stay on? I [want the boat] to get onto plane sooner and reduce bow rise.
jg125 posted 04-19-2009 12:19 PM ET (US)     Profile for jg125  Send Email to jg125     
I have a 2008 170 Montauk with the 90 FourStroke. I put the bolt-less StingRay fin on it and like it very much. I also had it on my 2006 150 Sport with the 60 FourStroke. It is easy to take on and off, has held on fine for me so far (two full seasons). I will always use it.


highanddry posted 04-19-2009 12:54 PM ET (US)     Profile for highanddry  Send Email to highanddry     
Just put on tabs, I did on my 190 Outrage or Nantucket, huge difference all around.
jimh posted 04-19-2009 02:45 PM ET (US)     Profile for jimh  Send Email to jimh     
Check with Mercury to see what they say about drilling through the anti-ventilation plate of a motor that is under warranty.
SC Joe posted 04-19-2009 04:04 PM ET (US)     Profile for SC Joe  Send Email to SC Joe     
I just don't see the need for these devices. These boats plane very quickly.
Phil T posted 04-20-2009 12:23 PM ET (US)     Profile for Phil T  Send Email to Phil T     
Joe - It is not about time-to-plane, some owners want to attain and/or maintain a plane at a lower speed.
jg125 posted 04-20-2009 01:10 PM ET (US)     Profile for jg125  Send Email to jg125     
The one I have does not require any drilling. I have a Sting Ray XRIII fin. It slides on the cavitation plate and is held in place by the anode /bolt. I got mine after a freind bought his new 150 Sport several years ago from a local BW dealer with it dealer installed. He loved it, so I bought one for the 150 Sport I had at the time. It was inexpensive, real easy to install/ remove, makes no marks on the cavitation plate (I remove it for winter storage) and I am very happy using it. I now have it on my 08 170 Montauk. I believe that the boat gets on plane quicker and stays on plane at lower speeds. I think that it has helped fuel economy too. I have read that top end speed may be negatively affected, but that does not bother me.
I have been happy with mine.
sapple posted 04-20-2009 04:26 PM ET (US)     Profile for sapple  Send Email to sapple     
According to previous threads on this subject Mercury does not recommend use of these devices.
John6789 posted 04-20-2009 08:42 PM ET (US)     Profile for John6789  Send Email to John6789     
Thanks for all your thoughts. Phil T is correct, it is about achieving and maintaining plane at lower speeds. I don't know how to evaluate which fin would be best but I will buy and try one of them (probably the stingray) and write back. I am a bit hesitant toward trim tabs due to complexity and cost.
Sal A posted 04-20-2009 09:00 PM ET (US)     Profile for Sal A  Send Email to Sal A     
On a 19 foot boat, I'd get tabs (I had the 190 Nantucket with tabs once upon a time).

And Phil T is right. Some bodies of water have a very short chop. Too choppy to go too fast, yet sitting in the hole below planing speed is a drag (no pun intended). Planing at lower speed is the goal.

fishinchips posted 04-20-2009 11:04 PM ET (US)     Profile for fishinchips  Send Email to fishinchips     
For a long time I was opposed to fins. Then I put one on and loved it ever since.
The reason why I like it is because I can acheive a lower planning speed. It helps alot when the seas are a bit nasty. I just can't stand falling off of plane. Then speeding back up to get on plane then you pound yourself to death.

Now, the fin does not correct listing. So if you have a listing problem, then get the trim tabs.


Feejer posted 04-21-2009 07:23 AM ET (US)     Profile for Feejer  Send Email to Feejer     
I wonder how it would work on a Verado 150 and Dauntless 180. I might try the no drill Stingray, I don't want to drill cav plate. The largest tabs I can install are 9 x 9.
gwcpa posted 04-27-2009 10:04 AM ET (US)     Profile for gwcpa  Send Email to gwcpa     

If you have any pics of the tabs installed, I'd appreciate it if you could direct me to them or shoot them to me in an e-mail.

My 190 has a Stingray "hydrofoil fin" on it now which helps quite a bit in lowing the planing speed and getting the boat on plane with a large load.

I may try a permatrim as well, but I'm trying to picture how the tabs fit with the swim platform installed, which I assume you had.

I know you had a lot of pics on the web at one time, but this may have been with the old AOL site that is now defunct?

Feejer posted 04-27-2009 10:55 AM ET (US)     Profile for Feejer  Send Email to Feejer     
I'll be trying a Mercury Vensura SS 4 blade Propeller 14-1/2" x 17" on my Verado 150 late next week. I'll let you know what if anything it does for me.

I've been told by Prop Gods this should lower my planing speed a few mph while adding some stern lift. I'd rather change the prop than put on trim tabs for what I need

20dauntless posted 04-27-2009 07:23 PM ET (US)     Profile for 20dauntless    
I have the SST hydrofoil on my C-Dory 22 with Honda BF90D. I had it installed at my Honda dealer, and since the one I bought was Honda branded and installed by an authorized Honda dealer my warranty is apparently not void. I also have Bennett tabs installed, and I find I use tabs for lateral trim and the motor for fore and aft trim. This seems to give me the best fuel economy and performance. When it's really nasty, I can have the engine fully tilted down and the tabs fully deployed and plane down to 8-9 mph.

The general consensus over on the C-Brats website, where many of us have either the SST or the Permatrim, is that these hydrofoils cost you a little bit in top speed, perhaps a little in fuel economy, but the difference in planing speed and comfort is definitely worth it.

I've toyed with getting one for the Whaler but hesitated because of the forces involved. Whereas the C-Dory tops out at 30 mph, the Whaler does almost twice that. I just am not convinced that it would be good for the engine to have that kind of force on it...

gwcpa posted 04-27-2009 09:18 PM ET (US)     Profile for gwcpa  Send Email to gwcpa     
Mine tops out at about 30. ;)

Going to maximize my slow speed use.

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