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Author Topic:   Boat speed
Chris posted 01-12-2002 03:58 PM ET (US)   Profile for Chris   Send Email to Chris  
Can anyone tell speed to be expected and the overall performance of a 15 Duantless (circa 1997) with a 70 3cyl and a 50 2cyl. I am looking at these boats for possible purchase. Both have a OMC engines and are 2 cycle engines... Thanks, Chris
jimh posted 01-14-2002 08:15 PM ET (US)     Profile for jimh  Send Email to jimh     
I have a older Whaler 15-Sport. This boat probably weighs less than a 15-Dauntless, perhaps by a couple of hundred pounds. With a "50-HP" powerhead rated engine it just gets into the mid-30's (MPH) range, and that is under optimum conditions (one person aboard, all canvas down, calm seas).
where2 posted 01-16-2002 02:12 PM ET (US)     Profile for where2  Send Email to where2     
The 15' Dauntless being more of a V hull and heavier, I expect it will run slower than a comparably equipped 15' Sport. My 15' Sport has a 70Hp (prop rated) OMC, and will skip along at 50MPH on flat water with the 13-1/4x19" SS prop.

Go for the 70Hp. A 50Hp won't be drastically more fuel efficient when pushing the same hull. However a 70Hp will be more useful after you put a few friends in the boat.

Bigshot posted 01-17-2002 12:36 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I say 70hp, that is a beefy boat.
sorcerer posted 01-17-2002 01:10 PM ET (US)     Profile for sorcerer    
Boston Whaler published this performance on the 15 Dauntless.

50hp Merc 4 stroke 36.3mph @ 5900 rpm 10-3/8X13ss 2 people 340 lbs.

75hp Merc ELPTO 44.7mph @ 5175 rpm 13-1/2X22 LII 2 people

70hp Yamaha TLR 41mph @6100 rpm 13-1/4x17 ss 2 people 340lbs

70hp Johnson TLE 39.5mph @6000 rpm 13-1/4x17ss 2 people 385lbs

PaulVT posted 01-22-2002 08:07 PM ET (US)     Profile for PaulVT  Send Email to PaulVT     
I bought a used 15' Dauntless with a 50 hp Merc 4 stroke, 10.75 x 12" aluminum prop. Top speed is 29-30 mph at ~5700-5800 RPM. The motor has a Stingray hydrofoil, which adds some drag, but fixes a porpoising problem. The 'foil might cost 1 mph. All speeds by GPS with 1-2 adults on board.

A friend with a 50 hp OMC 2 stroke on a Dauntless 15 runs around 30 mph (by GPS) without a hydrofoil.

How fast do you want to go? I typically cruise on plane 20-22 mph with the throttle backed off. If you are looking for speed and/or carry a gang, go for the bigger engine, but a 50 isn't out of the question.

JohnJ80 posted 01-25-2002 07:47 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I have a 15 dauntless with a Johnson 70 on it. It really, and I mean really goes. I don't have a speedo on it and I haven't put the GPS to it, but I found that at full throttle it was just too fast. If I hit any sort of sizeable boat wake, I 'd be airborne.

The comments about going for the big motor are right. When you add people to the boat it takes more to get it out of the hole and keep it on a plane. I think having the extra horses is a good idea plus I think that the difference in fuel economy is marginal if any. I also doubt that the weight savings would be significant.

So, given a choice, I would choose the larger motor.


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