when is it trimed to hi

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dannyman3

Petty Officer 2nd Class
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Apr 13, 2009
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147
i have a 1998 stealth 6in jack plate i do not have a trim gage i just need to know when ive went to far if i trim to far will that make it chinawalk or does that have any thing to do with it thanks to all the greats on here
 
SparkieBoat

SparkieBoat

Captain
Joined
Aug 17, 2009
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3,643
Re: when is it trimed to hi

yes it will bounce some if trimmed up too hi, also if motor is over revving or prop is cavitating (sucking air) you are too high.
 
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Chris1956

Supreme Mariner
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Mar 25, 2004
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28,109
Re: when is it trimed to hi

Danny, If you are trimmed too far, the bow may bounce up and down. This is called porpoising. Not all boats will do this, however. However, most all motors will ventilate and rev up and speed will fall, if it is trimmed too far.

Chinewalking is something some boats will do at some speeds and trim settings. However it is hull-specific.
 
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bob johnson

Rear Admiral
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Feb 25, 2009
Messages
4,306
Re: when is it trimed to hi

jacking up on the plate and trimming are two different things..which are you talking about???

they are independant of each other..and serve similar AND difference purposes.

you have a tach and a way to measure speed?

even with the right trim you can jack the plate and while it will not affect your porposing, you might go so high your prop loses its bite...

you would notice it first in turns, even the motor runs good going straight...( when you are jacked to high)

once you find a good height to run on the jack where you dont blow out...

you can play with the trim once on plane and watch the tach and speed...


you will peak for speed when trimming up, but start to fall off afterwards and might even lose bite and wash out the prop...

then obviously you ahve trimmed too far..


i can pick up a few mph once up on plane at WOT, if I play with the trim up a little..

I know most guys say just go by feel, but this is where i wish i had a workable usable trim gauge...because i would juts dial it in to that number and let it settle itself. and i woulnt have to watch gauges for 30 seconds..i could watch the water or anything else...


I have not experienced porposing since I have had a boat-motor combo with trim

I experienced it previously with a manual trim motor..

so i cant offer any advice on when you notice that effect while trimming..

I have floataton pods on the back and i doubt i will ever porpose with this boat..

good luck

bob
 
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dannyman3

Petty Officer 2nd Class
Joined
Apr 13, 2009
Messages
147
Re: when is it trimed to hi

bob johnson said:
jacking up on the plate and trimming are two different things..which are you talking about???

they are independant of each other..and serve similar AND difference purposes.

you have a tach and a way to measure speed?

even with the right trim you can jack the plate and while it will not affect your porposing, you might go so high your prop loses its bite...

you would notice it first in turns, even the motor runs good going straight...( when you are jacked to high)

once you find a good height to run on the jack where you dont blow out...

you can play with the trim once on plane and watch the tach and speed...


you will peak for speed when trimming up, but start to fall off afterwards and might even lose bite and wash out the prop...

then obviously you ahve trimmed too far..


i can pick up a few mph once up on plane at WOT, if I play with the trim up a little..

I know most guys say just go by feel, but this is where i wish i had a workable usable trim gauge...because i would juts dial it in to that number and let it settle itself. and i woulnt have to watch gauges for 30 seconds..i could watch the water or anything else...


I have not experienced porposing since I have had a boat-motor combo with trim

I experienced it previously with a manual trim motor..

so i cant offer any advice on when you notice that effect while trimming..

I have floataton pods on the back and i doubt i will ever porpose with this boat..

good luck

bob
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yeah i know what you mean about porposing mine is not doing that mine is china walking he what im having trubble with i just got the boat the motor was set hi the speed gage wouldnt work on plane and would spin the prop on turns i lowered the motor where the cavation plate was level with the lowest spot of the pad it fixed the gage on plane and spinning the prop on turns but it will china walk bad above 60 mph and i have lot of motor left the hole boat comes out the water i guess what i need to know on the jack plate what way do you adjust the motor to bring the boat closer to water on plane i dont want to drill holes on the back for them trim taps its a bass boat not ski i just would like to use all my motor so im not getting left behind on these turneys im in so if anyone has info on how to keep the hull in the water plese let me know thanks
 
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bob johnson

Rear Admiral
Joined
Feb 25, 2009
Messages
4,306
Re: when is it trimed to hi

PM messaging doesnt seem to work, so i got to post another site that deals with exactly what you are playing with...I dont dabble in your speeds, and i cant offer more than my experience or knowledge allows me...but these guys are running where you are with bass boats and jack plates and pads...


they will straighten you out

http://forums.screamandfly.com/forums/index.php


i have a feeling posting other sites might not be allowed...but hey...if the PMs would work, i would have to post it on the open forum

good luck

bob
 
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