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  lower top end when using doel fins?

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Author Topic:   lower top end when using doel fins?
timbo posted 06-24-2002 08:43 PM ET (US)   Click Here to See the Profile for timbo   Click Here to Email timbo  
I have read i think in a discussion that the fins 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.
acseatsri posted 06-24-2002 08:56 PM ET (US)     Click Here to See the Profile for acseatsri  Click Here to Email 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.
jimh posted 06-24-2002 09:22 PM ET (US)     Click Here to See the Profile for jimh  Click Here to Email jimh     
Please follow up in the PERFORMANCE section, where cavitation plate appendages are discussed on a regular basis.
Clark Roberts posted 06-24-2002 09:26 PM ET (US)     Click Here to See the Profile for Clark Roberts  Click Here to Email 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)     Click Here to See the Profile for FISHNFF  Click Here to Email 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.


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