chine walking stratos please help

mdavenport

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Jan 30, 2010
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11
i recently bought a stratos 278 with a 150 johnson. everytime i try to trim it up when i get to halfway thats is far as i can go without the boat wanting to chine walk. it currently has a raker 24 pitch 3 blade prop. i have been told a four blade will solve the problem and raising the jack plate. the jack plate is not hydraulic. what do you suggest to me to get the maximum performance out of it. i can run it wide open but not trimmed more than halfway out so i dont really know how much the boat really has.
 

Dhadley

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Feb 4, 2001
Messages
16,978
Re: chine walking stratos please help

Tell us more about your set up. Yes, that boat needs a prop with bow lift but a Raker should be OK. Is it a Raker II? What's the top speed & rpm? Have you raised the plate?
 

Capt'n Chris

Chief Petty Officer
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May 21, 2009
Messages
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Re: chine walking stratos please help

Do you have adequate trim range now now? Have you found where your theoretical zero trim angle is? If you can run at that (zero trim), or positive from that at speed, bow lift is no issue, unless you're plowing. Anything less, at speed, is counter productive. Can you run now (with your current prop) @ wide open at max rpms with the load that you will generally carry, at 0 trim plus? If your motor is not creating a drag spray (set too low) or ventilating improperly (set too high), I would be safe in assuming that there is not much that can be done and no need to think about changing props if yours is in good shape and you are able to accomplish the above. A prop cannot change ?chine walk?. "Chine walk" is the phenomenon that any boat at speed will experience as it cuts at list and grabs the water. Some are more susceptible than others to do so particularly a hard chine designed hull. Every boat has a chine which is simply the transition between the sides and the bottom. Every maker has his own design....hard to soft. At high speed, the violent list port to starboard from wind, water current, boat wake or any other minor disturbance can be fatal. If intermittent ?chine walk? can be corrected at all, it must be done by a skilled driver.
 

Gary H NC

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Dec 1, 2005
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8,972
Re: chine walking stratos please help

I wonder how Smart Tabs would work? or would the be out of the water to the point they would not be touching the water enough to help
the side to side motion? Or would it cause other strange handling probems?



Just thinking....:confused:
 

Dhadley

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Feb 4, 2001
Messages
16,978
Re: chine walking stratos please help

We know that this boat needs help with bow lift. Any kind of tabs will not help with bow lift. We also know that set up has everything to do with handling. And the wrong prop can and will cause chine walking. Espically if the initial set up is wrong.
 

mdavenport

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Jan 30, 2010
Messages
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Re: chine walking stratos please help

im not sure if it is a raker II or not. i have not changed the height of the jack plate yet. i have only had it a couple of days. i have heard that stratos boats typically are known for "chinewalk" but im not real sure with this being the first one i have owned. i met a guy today that had a 285 xl with a 175 johnson and he said his was awful until he put the four blade prop on it. the rpm guage isnt working so i dont know exactly what it is turning but from the sound of the motor it doesnt seem to be over revving. i guess you would have to drive it to understand the feeling it gives to pin point it. as far as plowing it doesnt look to be but it feels like it when your driving. i guess i just need to pick a place to start and try things one at a time. what would be the best place to start?
 

mdavenport

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Jan 30, 2010
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Re: chine walking stratos please help

is there anywhere i can research the hull to see if it is a "hard chine design"?
 

Dhadley

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Feb 4, 2001
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Re: chine walking stratos please help

Getting the tach to work is the first thing to do. Then start dialing in the set up. Sounds like the motor may need to come up some. You'll have to play with it to learn how to drive it. It can be a handfull but you can do it. You have to play with the steering to balance it once you get it up on the pad.
 

mdavenport

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Jan 30, 2010
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Re: chine walking stratos please help

alright thanks for all the input once i get the tach working i can let you all know how many rpms its turning. a safe range would be what around 5500???
 

Dhadley

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Feb 4, 2001
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16,978
Re: chine walking stratos please help

5800 is a good target for either the 150 crossflow or looper.
 

mdavenport

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Jan 30, 2010
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Re: chine walking stratos please help

havent had a chance to go back to the lake yet but i have educated myself a little more. the jack plate on my boat is a rapid jack made by hydro dynamics so it should be really easy to adjust my height. everyone on here is saying raise the motor. everyone at boat shops around here is saying to lower it. with the boat sitting on the trailer i trimmed the motor to exactly half way, the intake on the foot of the motor is inline with the pad on the boat if that will give any correlation? which is the right way to move.
 

hwsiii

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Jan 25, 2009
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2,639
Re: chine walking stratos please help

M, you need to be listening to what Dhadley has to say, as he is the one with the most knowledge talking to you,as far as I am concerned. He tests props for manufacturers for a living. I do not mean to demean anybody else in this discussion, so please don't take it that way.


H
 

walleyehed

Admiral
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Jun 29, 2003
Messages
6,767
Re: chine walking stratos please help

For (approx) every 5" back the gearcase leading edge is from the pad the water-line ends up about 1" higher.
Stay with Dhadley on this and he'll help you find the sweet-spot.
 

mdavenport

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Jan 30, 2010
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Re: chine walking stratos please help

thanks, i am going to take it to the lake this weekend and up will be the first way i go with it. thanks again for all the input.
 

walleyehed

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Jun 29, 2003
Messages
6,767
Re: chine walking stratos please help

Do you have a water pressure gauge installed??? I would assume you do being a Bassboat. If you see pressure fluctuations at speed, leave the jackplate alone but pull back easily to slow and fall off plane then mark your jackplate location. This will be your reference point.
 

mdavenport

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Jan 30, 2010
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Re: chine walking stratos please help

thanks dhadley took the boat to the lake, raised the jackplate, gained stabilitly and 25% more water pressure. lowered it just for giggles and after it planed out the prop wouldnt bite at all. without you guys i would be at a loss thanks for all the input you are all very knowledgeable!!!!!!
 

Rudy Brown

Petty Officer 1st Class
Joined
Apr 3, 2005
Messages
289
Re: chine walking stratos please help

thanks dhadley took the boat to the lake, raised the jackplate, gained stabilitly and 25% more water pressure. lowered it just for giggles and after it planed out the prop wouldnt bite at all. without you guys i would be at a loss thanks for all the input you are all very knowledgeable!!!!!!
Like someone else said Dhadley is da man. He and walleyehed have helped me out a bunch.
 

mdavenport

Cadet
Joined
Jan 30, 2010
Messages
11
Re: chine walking stratos please help

definitly take everything he says to heart. getting a hot foot and blinker trim this month. being able to feather the throttle should also help alot.
 
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