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Author Topic:   Dol-fin [or Doel-fin]
Chris posted 06-24-2002 02:44 AM ET (US)   Profile for Chris   Send Email to Chris  
Dolfin or Stringray or leave it! on 1988 13 SS with 30hp Johnson what do you guys think?
scattcat posted 06-24-2002 11:11 AM ET (US)     Profile for scattcat  Send Email to scattcat     
I can't say for sure on your 13, but on my 15 sport I added a doel-fin and dramaticly improved hadlind, hole shot, and planeability at lower speeds.....Heath
whaleryo posted 06-24-2002 12:00 PM ET (US)     Profile for whaleryo  Send Email to whaleryo     
Ditto for me. The Doelfin made a dramatic improvement on my 15'Sport with 70Yamaha.

mbking1 posted 06-24-2002 07:44 PM ET (US)     Profile for mbking1  Send Email to mbking1     
Works great on my 17 Montauk..Mark
JBCornwell posted 06-24-2002 09:54 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Try the SE Sport 200 or 300. My Montauk just rises onto plane, no "hole shot" at all.

Red sky at night. . .
JB :)

timbo posted 06-24-2002 09:24 PM ET (US)     Profile for timbo  Send Email to timbo     
[This topic was originally posted to the GENERAL FORUM. This thread has been edited--jimh.]

Do [Doelfins] Reduce Top Speed?

[I] have read...that [Doelfins] actually lower your top end a couple of miles an hour, although on another discussion I read all good things about them. I plan on installing them on my 1973 13-Sport. Any follow up would be appreciated.

JBCornwell posted 06-24-2002 09:59 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Timbo.

I water tested my Montauk with her new Suzi without a fin to select the prop. 38.5mph at 5800rpm.

I added a SE Sport 300. Planes at lower speed, doesn't raise the bow, just rises onto plane. 38.5mph at 5800rpm.

I recommend the SE Sport 200 or 300.

Red sky at night. . .
JB :)

bsmotril posted 06-24-2002 10:16 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Speed loss will depend on whether or not your cav plate rides above the water, or under it at top speed. Have someone else run the boat at top speed while you peer over the transom and CAREFULLY observe the cavitation plate. If it is riding out of the water, a fin will probably not bring down your top speed. Make sure to trim the motor out for max speed while doing this.
acseatsri posted 06-24-2002 08:56 PM ET (US)     Profile for acseatsri  Send Email to acseatsri     
If your main goal is to go fast, I wouldn't install one, as I've heard from others that they scrub 2-3 mhp off your speed. If you want to cruise more comfortably and keep the bow down to avoid "porpoising" at lower speeds, install one.
Clark Roberts posted 06-24-2002 09:26 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I use Doel-Fins on all my boats and set the engines high (most on jack plates) so that fin is riding just on surface of water at speed... thus no fin in water and no loss of speed. Most engines are set up low on transom and drag of lower unit robs top speed and economy... one must be sure cooling water pick-up/flow/pressure is not compromised by getting up too high! I also run temp and press gauges... Happy Whalin'.. Clark.. Spruce Creek Navy
FISHNFF posted 06-25-2002 01:27 AM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
I have a Doel Fin on a Merc 90 4S mounted on the third hole up. No loss of top end at all, as the fin is riding out of the water at speed.


jimh posted 06-25-2002 05:10 AM ET (US)     Profile for jimh  Send Email to jimh     
[Three concurrent threads with discussion on Doelfins have been collapsed into this single thread.]

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