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  ideal motor height for dauntless 17?

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Author Topic:   ideal motor height for dauntless 17?
lerker posted 06-16-2004 11:34 AM ET (US)   Profile for lerker   Send Email to lerker  
i am wondering if anyone with a 1995-1997 dauntless 17 has experimented with the motor mounting height. mine is currently mounted in the middle set of 5 holes. i am not sure about the current relationship between the bottom of the transom and the AV plate on my merc 115...

the previous owner put a doel-fin on the boat. currently, it does not popoise, but performance is a little disappointing. i can only get it up to around 34mph at WOT. hole shot is pretty good. i have also noticed that the boat will lean badly to port or starboard as it gets to plane. i am pretty sure the doel-fin is probably causing this, if i remember correctly i read a post about it. (by jimh?)

i am going to swap out the prop soon, and i am wondering if i should raise the engine a hole too.

anyway, if anyone has input i would appreciate it.

JohnJ80 posted 06-16-2004 11:51 AM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
Are you trimming the motor up at all when on a plane? If the boat is leaning, one cause of this can be the torque of the prop at the angle the lower unit is meeting the water. Try trimming up a bit and seeing if the lean goes away.

Also, what you running for a prop on that motor and what is your RPM at max throttle? (I'm not expert on propping, but others here are.). Your top end speed is going to be strongly influenced by prop selection.

J

lerker posted 06-16-2004 01:01 PM ET (US)     Profile for lerker  Send Email to lerker     
i seem to experience the lean when the motor is trimmed up and out getting out of the hole. its not bad to nonexistent with the motor trimmed down/in.

i believe the prop is a 15" pitch, which gives me 34mph at 5400rpm WOT. i could be wrong, i deduced the pitch with the propeller calculator on continuouswave.

i am going to try 17" and 19" pitch props.

TomT posted 06-16-2004 09:42 PM ET (US)     Profile for TomT  Send Email to TomT     
You may consider adjusting the trim tab (just above the prop) to neutralize the helm so it goes straight down the lake.
lerker posted 06-16-2004 09:45 PM ET (US)     Profile for lerker  Send Email to lerker     
tom,

the trim tab is fine and the boat does indeed go straight... i haven't tested it in a lake though, as its a saltwater boat.

Richard Quinlivan posted 06-16-2004 11:48 PM ET (US)     Profile for Richard Quinlivan  Send Email to Richard Quinlivan     
lerker

I have a 1995 17 Dauntless with a 125 Merc. i get 46 mph at 5400 with a Merc laser 2 prop. the motor is mounted all the way up as far as it will go. this puts the anti ventilation plate about 1 3/4 inches up. With a 115 you should be able to turn a 19 or 20 above 5000 rpm and get into the low 40's. I have no leaning. my boat will porpose but is better with the engine up then down.

lerker posted 06-17-2004 08:47 AM ET (US)     Profile for lerker  Send Email to lerker     
thanks richard!

you posted on my thread regarding prop pitch also, and i really appreciate all of your help. i find it reassuring to have input from someone with a very similar boat. i believe for some reason the 1995 dauntless 17 is lighter than my 1996, and of course you have the 10 extra ponies.

in the future, i will just email you. ;) (kidding)

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