Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-09-2013, 13:36   #1
Registered User
 
montenido's Avatar

Join Date: Jun 2010
Location: Lying La Paz, BCS
Boat: 1979 Marshall Californian 42 LRC
Posts: 339
Images: 4
How Many of You are using Doel-fins, or other stabilizing fins?

Hi all,

I just picked up a mid-90s Johnson 15 hp 2-stroke and I'm thinking about adding a set of those planning fins that attach to the lower section of the OB. Do any of you use these? If so, are they worth doing?

Thanks, Bill
__________________

__________________
M/V Ansedonia
'91 Californian 52 CPMY
Channel Islands, CA
montenido is offline   Reply With Quote
Old 14-09-2013, 14:28   #2
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: How Many of You are using Doel-fins, or other stabilizing fins?

The best $40 I have ever spent on the dinghy.
__________________

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 14-09-2013, 14:56   #3
Registered User
 
SmartMove's Avatar

Join Date: Aug 2011
Location: Cruising the Eastern Caribbean
Boat: Beneteau 473
Posts: 779
Images: 1
Ditto what Mark said, the best addition to the dinghy yet.
__________________
Time is a companion that goes with us on a journey. It reminds us to cherish each moment, because it will never come again. What we leave behind is not as important as how we have lived. JEAN LUC PICARD, Captain of the Starship Enterprise
SmartMove is offline   Reply With Quote
Old 14-09-2013, 17:16   #4
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: How Many of You are using Doel-fins, or other stabilizing fins?

I have used Doel-fins, but prefer the SE Sport 200. Amazon.com: SE Sport 200 Hydrofoil: Sports & Outdoors

However, these really only work well if you are a bit underpowered or really need to get up on plane fast (water skiing). Most people are over-propped and can get the same benefit from going a bit lower in pitch. They do reduce top speed a bit, but will allow planing at a bit lower speed.

If you are getting up on plane easily now with normal loads, and can maintain that plane at 3/4 (preferably 2/3) or less throttle, then these won't help all that much.

If you plan on removing the engine from the dinghy often, keep in mind that these stick out quite a bit and can be cumbersome when moving the engine around and when storing it. The Doel-Fins are the worst for this.

Use your new engine on your dinghy for a bit first to see if you are missing anything. If you have trouble getting on plane, or your bow shoots to the sky while doing so (with correct tilt trim), or you need full or mostly full throttle to keep on plane, then a hydrofoil may help.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 14-09-2013, 17:42   #5
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,762
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: How Many of You are using Doel-fins, or other stabilizing fins?

do it. it works.
zeehag is offline   Reply With Quote
Old 14-09-2013, 18:45   #6
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: How Many of You are using Doel-fins, or other stabilizing fins?

Quote:
Originally Posted by zeehag View Post
do it. it works.


Sorry, blanket statements without reason do that to me.

Bill, my advice here is more sound - actually use your dinghy without them first and see where the possible weaknesses lie before adding them. Also think about how you will need to remove/move your engine and how they may effect that.

I have had dinghy/engine combos that benefited greatly from them, as well as combos where they added nothing and possibly decreased performance.

If you are removing and moving your engine a lot, they are definitely not conducive to that - although some are better than others.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 14-09-2013, 18:57   #7
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,762
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: How Many of You are using Doel-fins, or other stabilizing fins?

i used them for over 15 years in san diego bay on long and short shaft outboards on dinghies and on sailiboats. i didnt notice nay difference with the sloops, but the stability with dinghies was noticeably better. yes 15 years i used copies and i used doel fin. both work..
colemj. do you approve of that one.
zeehag is offline   Reply With Quote
Old 14-09-2013, 18:57   #8
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 7,915
Quote:
Originally Posted by colemj View Post

....

If you plan on removing the engine from the dinghy often, keep in mind that these stick out quite a bit and can be cumbersome when moving the engine around and when storing it. The Doel-Fins are the worst for this.

...
And those protruding fins can exert more leverage on the cavitation plates where they attach. Ive seen a couple broken this way...handle w care.
__________________
belizesailor is offline   Reply With Quote
Old 14-09-2013, 20:39   #9
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: How Many of You are using Doel-fins, or other stabilizing fins?

I used my Yamaha 15hp outboard on my Achilles 10'.5" RIB without and with the fins and can say without a doubt the Stabilizing Fins improve performance!

I have the something similar to the Sport Marine SE300 and it works well get the boat up on plane and also stabilizes the boat in high speed turns, keeping it from sliding.

I store my outboard on the transom of our sailboat when traveling and have never had any problems with the fins getting in the way.

As far as breaking cavitation plates... Well if a semi flexible plastic fin can exert enough force to break a cavitation plate, then maybe it is time for a new engine.
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 14-09-2013, 23:45   #10
Registered User

Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
Re: How Many of You are using Doel-fins, or other stabilizing fins?

Ive used them on many of my dinks, and all of them have been hard dinks, they help a bunch! I use them on my inshore fishing boat, gets me up on a plane in 10 ft from the time I twist the throttle! Thats with a 40 hp 4 stroke on a 16 1/2 ft aluminum CC flats boat! They really have helped on my dinks, cus I could plane with smaller engines then I could without the vanes! Just my 2 cents
__________________
Bob and Connie
bobconnie is offline   Reply With Quote
Old 15-09-2013, 00:01   #11
Registered User

Join Date: Sep 2012
Posts: 4,924
Re: How Many of You are using Doel-fins, or other stabilizing fins?

I found the one made from aluminum to work better than the plastic ones but that might have been just in my case. The aluminum one was also smaller.
__________________
robert sailor is offline   Reply With Quote
Old 15-09-2013, 00:03   #12
Registered User

Join Date: Sep 2012
Posts: 4,924
Re: How Many of You are using Doel-fins, or other stabilizing fins?

Mark J you are running the same dink engine combo that I did years ago and I'm trying to find a good place to get another set.
__________________
robert sailor is offline   Reply With Quote
Old 15-09-2013, 00:18   #13
Registered User
 
Wench'sCaptain's Avatar

Join Date: Oct 2011
Location: On the Boat
Boat: Hunter Helsen 470
Posts: 132
Re: How Many of You are using Doel-fins, or other stabilizing fins?

Quote:
Originally Posted by colemj View Post
I have used Doel-fins, but prefer the SE Sport 200. Amazon.com: SE Sport 200 Hydrofoil: Sports & Outdoors

However, these really only work well if you are a bit underpowered or really need to get up on plane fast (water skiing). Most people are over-propped and can get the same benefit from going a bit lower in pitch. They do reduce top speed a bit, but will allow planing at a bit lower speed.

If you are getting up on plane easily now with normal loads, and can maintain that plane at 3/4 (preferably 2/3) or less throttle, then these won't help all that much.

If you plan on removing the engine from the dinghy often, keep in mind that these stick out quite a bit and can be cumbersome when moving the engine around and when storing it. The Doel-Fins are the worst for this.

Use your new engine on your dinghy for a bit first to see if you are missing anything. If you have trouble getting on plane, or your bow shoots to the sky while doing so (with correct tilt trim), or you need full or mostly full throttle to keep on plane, then a hydrofoil may help.

Mark

I agree with try it first. But I have had a fin ( different brands) on every power boat I have owned since they came out. Gets you on plane quicker and you can stay on plane at slower speeds.
__________________
Wench'sCaptain is offline   Reply With Quote
Old 19-09-2013, 18:45   #14
Registered User

Join Date: Oct 2012
Location: nelson new zealand
Boat: kuiper 32
Posts: 198
Images: 3
Re: How Many of You are using Doel-fins, or other stabilizing fins?

I have a mac 360 dinghy with an 18 hp tohatsu motor with 2 heavy divers onboard without the fins it struggled to get onto the plane.With the fins its straight up on the plane without the bow climbing for the sky.Best thing I ever did.I was sceptical about fins before now I am sold on them.
__________________
builder dan is offline   Reply With Quote
Old 20-09-2013, 11:18   #15
Registered User
 
Wraith_Mac's Avatar

Join Date: Aug 2013
Location: Central Coast, NSW, Australia
Boat: Avon Rib, 65hp
Posts: 304
Re: How Many of You are using Doel-fins, or other stabilizing fins?

Then-- Mid 90s Johnson 15hp short shaft tiller steer with Zodiac Inflatable, went from dog to great with fins. After 15yrs use gave it to mate, still going strong.
Now-- Avon rigid hulled inflatable with elec. start, trim/tilt, reinforced transom, long range tanks, double bottom, w/ Suzuki DT65, plenty of weight.
Added fins soon after I bought over 20yrs ago. Made a great boat even better, leaps out of the hole, with a load, still going great.
In between I have added quite a few sets to friends boats, while results have varied between 'good' and 'outstanding', I have not known a set to have a neutral or negative effect.
Cheers,
Mac
__________________

__________________
Wraith_Mac is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:06.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.