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Tedric posted 09-28-2001 10:27 PM ET (US)   Profile for Tedric   Send Email to Tedric  
I just bought a 1995 Dauntless13 and find it very prone to porpoising. It has a 40HP mercury and I have had it reproped to a 13 pitch. I was woundering what experience anyone had had with this model and should I consider putting and transom extender to put the engine further behind the stern? all advice will be appreciated along with anyones experience with this boat
OutrageMan posted 09-28-2001 11:01 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Porpousing is most commonly caused by over-trimming your engine. Whe it starts to do the boucity bounce, try bringin it in a bit. If that doesn't do the trick, try a Stingray Hydrofoil before you put on a setback.


Tedric posted 09-29-2001 10:11 AM ET (US)     Profile for Tedric  Send Email to Tedric     
Thanks for the quick reply, and that much I have already done, but find it a bit too sensitive. also she won't plane below 4200RPM...Is this normal? I am using a 13 pitch prop and have a Hydrofoil (whaletail) on the engine...Any other thoughts on the matter. People tell me she should plane at a much lower RPM however they don't have a Dauntless13. Thanks again
Bigshot posted 10-02-2001 11:05 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
What is your WOT rpm's? What prop came on it?
Tedric posted 10-02-2001 11:25 AM ET (US)     Profile for Tedric  Send Email to Tedric     
Prop when I bought it was a 12pitch but wouldn't rev over 5000RPM. I now am using a 14 and it gets up fairly fast and rev's up to over 6000RPM If I lower speed to anything less the about 43000 she drops out of plane. Marine store is now suggesting a 13 pitch as probably the correct one. What RPM should this boat plane at to get best ride and economy? Since there are not other boats of this type up here in Arkansas I have no way to know noral is. Thanks for all your help.
Dick posted 10-02-2001 12:12 PM ET (US)     Profile for Dick  Send Email to Dick     

I'll scan and e-mail you a performance test from Boston Whaler on the 13 Dauntless.


LarrySherman posted 10-02-2001 12:13 PM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
That does not make sense. If you go up in pitch, you should go down in RPMs. Plus, 1000 RPM change for a 2 inch change in pitch is strange too.
Bigshot posted 10-03-2001 11:25 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
usually 200rpm's per inch but when dealing with a 13 or anything weight sensative, yes a 2" might drop him 1000.
PJB posted 10-03-2001 05:38 PM ET (US)     Profile for PJB  Send Email to PJB     
I have the same hull with a 50 merc and a doel-fin. With a 12p the boat has a monster holeshot but quickly overreved to over 5600k,great prop for sking or a heavy boatload. These hulls are prone to porpoising especially on calm water when you are swinging a big prop,in my case a 14p 4 blade. My boat will pull 5k on flat water, about 39 mph, with a 6 to 8 inch chop, it pulls 5250 at about 43 mph,they like a little chop for WOT running. I never had a porpoising problem with the 12p typhoon. I can hold plane 3400 with the 12p, 2750 with the 14. Something sounds fishy with your RPMs and your prop selections. 6K seems a lot to pull with a 13p, you should be in the 5k to 55k range. I would have my tach checked out. Slow down and try to move your trim in small increments, particularly on calm water. 12p faster holeshot, slower top speed; 13p slower holeshot, faster top speed. Definately have your tach checked out because mine has given false readings before. Good luck.
flwhaler posted 10-03-2001 06:29 PM ET (US)     Profile for flwhaler  Send Email to flwhaler     
I don't think it is your prop or your motor. I heard that the hull design was bad for that year. That is why they went to the 14 footer, and have since scrapped that once as well. (for the sake that for a 1000 more one could get the 16) But then again you could play with some trim tabs to solve your issue.


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