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Author Topic:   Outboard Hydro-foils...Doel-Fin or Stingray?
CHenry posted 09-21-2001 07:49 PM ET (US)   Profile for CHenry   Send Email to CHenry  
Realized that trim tabs wouldn't work on my '97 17' Outrage w/135 Merc do to a conflict with the swim step. So I think I'll be adding a Hydro-foil to the Outboard.

Looks like the two most popular models are the Doel-Fin and the Stingray. It seems to me that because the Stingray is a single piece and that it extends out toward the rear of the cavitation plate in addition to both sides that it would be a more durable and effective piece as compare to the Doel-Fin.

The Doel-Fin is a two-piece unit that doesn't extend out toward the rear at all, only out the sides.

Am I correct in my thinking? What are your thoughts/opinions?



lhg posted 09-21-2001 08:20 PM ET (US)     Profile for lhg    
There is already a lengthy thread on this subject from a few months ago.
kingfish posted 09-21-2001 09:07 PM ET (US)     Profile for kingfish  Send Email to kingfish     
...And my opinion then and now was/is Doel-fins.


Dick posted 09-21-2001 09:47 PM ET (US)     Profile for Dick  Send Email to Dick     
I tried a Doel Fin on my Montauk, didn't see any change so I took it off. Tempted to try a Stingray.
CHenry posted 09-22-2001 01:30 AM ET (US)     Profile for CHenry  Send Email to CHenry     
OK...found the previous thread...without a "search" feature it's kinda difficult to find these things. It was rather informative (all 62 posts) but it's still not clear to me which to choose (or whether to use them at all)...I guess I'll just have to try for myself and formulate my own opinion(s)
Bubba posted 09-22-2001 06:34 AM ET (US)     Profile for Bubba  Send Email to Bubba     
I doubt if there is any subject that has not been discussed here with a lengthy thread.
When others refer you to search for the thread I quess they are trying to be of help but the comment is probably taken as a putoff and usually kills the new post. Is that the intent?
John from Madison CT posted 09-22-2001 07:54 AM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     

I didn't think this message board has a "search" feature like others. If it does, let me know how to access it.


kingfish posted 09-22-2001 08:18 AM ET (US)     Profile for kingfish  Send Email to kingfish     

No, (speaking from the perspective of one who has made reference to earlier threads) it is not the intent to kill the thread. It's just a matter of suggesting it may not be necessary to reinvent the wheel, when the information asked for has already been discussed. In most cases, if the question isn't answered outright in the earlier thread, the poster will at least be exposed to some additional thought and information, and may find he or she would benefit from refining their question based on that data.

John from Madison CT-

When you get to the referenced section, expand the topic to "Show all topics from last 2 years" then open "edit" in your tool bar and open "Find (on this Page)"; type in the key word(s) (i.e., "Doel-fin"), and it will search the topic *headers* for that word. You can see the importance of creating headers that are cogent.

Or, you can just scroll through the topics and see if you recognize one or more that seem pertinent.


bc posted 09-22-2001 06:58 PM ET (US)     Profile for bc    
I've run both on my sundance skiff. The stingray has a more drastic effect on forcing the bow down. Doelfin less drastic and less "drag". Notice that the stingray has a downward curvature on the back. This skiff with the oversized forty HP worked out better with the stingray rather than the doelfins. Eventually bought a 25hp and the skiff performed ok without one. (I think they are both ugly) I may still have the stingray laying around somewhere if anyone is interested in it.
jimh posted 09-25-2001 09:19 AM ET (US)     Profile for jimh  Send Email to jimh     
The Doel-Fin -vs- No-Doel-Fin camp seems split on pretty hard ground. Some folks swear by them. I always wonder why the outboard maker didn't put them on or offer them as options, if they were so beneficial.

As for the search...yes, I know it is much needed. It will be implemented this fall, after I put my boats to bed for the winter.

Often people who cite "previous thread" DO include a pointer to it, but if it is not given you should not take it as a "buzz off", but just an omission because it IS hard to find those old threads. Sometimes the TOPIC line is not the best descriptor of the contents of the thread, and this can throw you off.

In general, there is a wealth of material in the older threads (all 15,000 + of them), and it also allows the new reader a glimpse of the personalities and characters that contribute to the FORUM.


Erik posted 09-25-2001 07:43 PM ET (US)     Profile for Erik    
A friend of mind made a VERY effective hydrofoil from a 2'x1' piece of 1/8" thick stainless steel plate that he brought to a machine shop to custom make it. He gave the SS plate to the guy with a pencil outline of exactly what he wanted cut. Althought his application was a 9' semivee race boat with a very powerfully tweaked 30hp Johnson im sure it would work with whalers just fine. It looks just like a doel-fin but its smaller and connects in the front like a stingray. The wings are accuratly bent slightly up in the front and down in the back by cutting through the wings except in the middle where they actually bend it. It is lightly polished and sharpened to cut the water. There is no bent lip like you can find on almost all hydrofoils to create drag. Im gonna start one pretty soon for my engine.
CHenry posted 09-26-2001 09:36 PM ET (US)     Profile for CHenry  Send Email to CHenry     
OK went to West Marine and looked at both the Stingray and the Doel Fin. I still think the Stingray is probably more structurally sound due to it's one piece construction; but that thing's huge! Purchased the Doel Fin...I'll bolt it on over the weekend and see where it gets me
Dr T posted 09-27-2001 01:51 PM ET (US)     Profile for Dr T  Send Email to Dr T     

You may want a 90 degree chuck for your drill on hand. It makes getting to the hole template on the fin a bit easier for some lower units.

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