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  Top speed for Dauntless 16 with 100 Merc.

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Author Topic:   Top speed for Dauntless 16 with 100 Merc.
Sal DiMercurio posted 11-25-2003 08:51 PM ET (US)   Profile for Sal DiMercurio   Send Email to Sal DiMercurio  
While pulling my boat out of the water today there was a guy with a Dauntless 16 & a Merc that had a 115 coweling but later found out it was a 100 hp.
I noticed the engine all the way down with the bracket right on the transom.
I asked the guy what kind of speed he gets out of it & if it porpoises.
He said 32 mph at wot & yes it porpoises.
I said number 1, your engine needs to be raised up about 2" or more to stop it from popoising & allow that engine to unwinde & run looser.
He says, well how is it supposed to stay on the transom if the bracket isn't hooked to the top of the transom, [ i said to myself, oh brother ].
We pulled our boats out together & chatted for a while & i suggested he raise the engine 3 holes & check out this site.
It's amazing how many people are running around with horrible setups & thinking thats as good as it gets.
I would think that 100 merc should get at least 45 mph on that rig.
Jamber posted 11-25-2003 09:24 PM ET (US)     Profile for Jamber  Send Email to Jamber     

I got 42.3mph out of my 1999 16 Duantless with a Yamaha F100 4stroke. Mine does porpoise a bit, but is easliy fixed with trim/throtle. I have been thinking about raising mine one or two holes (I'm currently on the second to the bottom out of 4 holes). I just need sometime to do it.
Some pics from an early post I made about this.


Marlin posted 11-25-2003 10:03 PM ET (US)     Profile for Marlin  Send Email to Marlin     
My 2003 160 Dauntless with a Merc 115 4-stroke hits just over 44 MPH, raised 1 hole up. It porpoises somewhat, but MUCH less than when the motor was all the way down, and it's easily trimmed away. At 2 holes up, the 16" Vengeance prop ventilates too easily, from other conversations it seems like a Stiletto or a Raptor might be the best choice, since the Laser II comes in a minimum pitch of 20".

Any way you look at it, 32 MPH is waaaay slow for 100 HP on that boat. One or two others (like Perry, I think) with a 90 HP hit more like 38-40.


Perry posted 11-26-2003 01:43 AM ET (US)     Profile for Perry  Send Email to Perry     
Yea Sal, I too am amazed at how the dealers just drop the motor all the way down on the transom. I guess it is just easier for them. My anti-ventilation plate is 1 3/4" above the bottom of the hull (2002 Dauntless 160). I Have a Honda 90 and it will top out at 39.8 mph at 6000 rpm with a 13.25 X 16 stainless prop.

With a 100 hp mercury 2 stroke, that boat should go around 43+ mph with the right motor height and prop.

Wet Foot posted 11-26-2003 12:40 PM ET (US)     Profile for Wet Foot  Send Email to Wet Foot     
Hi Sal,

I have a porpoise problem with my 2001 18ft Dauntless with a 125 HP Merc and a Yamaha 8 HP kicker. I am at the max transom weight, but not over, and the 125 is in the center mounting holes. My engine was installed by Whaler and my dealer tells me not to raise it since Whaler mounted it in the optimum spot. I thought about adding the Hyrolift fin, but that puts even more weight on my transom. My scuppers are submerged when docked. Should my anti-vent plate be above the notch in bottom or above the actual bottom? When measuring height above bottom, should your straight edge be level when touching bottom/transom edge? Or should I use a long straight edge so I'm extending the bottom of boat? This porpoising problem is a real drag. I can't get up on plane at all with someone sitting on the stern seat. Maybe a weight in the bow locker would help. Advice appreciated!

Sal DiMercurio posted 11-26-2003 04:27 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Raise that engine at least another notch & you watch how that boat stops leaping around like a frog.
Keep in mind your engine is going to gain a couple hundred rpms so you might need to re/prop if she over revs.
If someones sitting in the stern you need to trim in "ALL" the way to get on plane, if that dosen't help then you need to bring some weight forward.
A Dole fin dosen't weigh 5 lbs so thats not a problem as far as weight goes.
You might concider moving your batteries forward or anything else that can be moved.
cmarques posted 11-28-2003 07:12 PM ET (US)     Profile for cmarques  Send Email to cmarques     
My 2002 Dauntless 160 will reach anywhere from 38-42 with a Merc 90 2s. Depends on whether the top is up or down and how many people on boat. I lost a few mph after I installed doel fins but helped greatly with the porpoising. It is in the 2nd hole from top and running a stock aluminum prop and has a notched transom. Soon I hope to raise the motor a hole up and maybe get a SS prop next year sometime.

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