Trim question.

CntrySngr

Petty Officer 2nd Class
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May 31, 2005
Messages
196
I have been "playing" with my trim while cruising on the lake to get a better feel for it. While the trim is all the way down, I get to plane faster as I should, and its pretty easy to steer. However, if I trim to 1/2 while planing, increasing my speed, the steering becomes too stiff to do anything with.<br /><br />Is this normal? The trim gauge says 1/2 trim when I trim it up to where it stops. To get it all the way up I have to use the Trailer button. I figured this is normal. When I trim to 1/2 am I going too far with the trim? Should I actually be going to 3/4?<br /><br />Thanks!<br /><br />Steven
 

QC

Supreme Mariner
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Mar 22, 2005
Messages
22,783
Re: Trim question.

Does your boat have power steering?<br /><br />The gauge and the trim button operation sound right to me. No, you should not go above the trim setting unless you are below 1000 RPM. You would use that for shallow water operation such as coming into a beach etc.<br /><br />BTW, welcome! :)
 

prockvoan

Chief Petty Officer
Joined
Jul 27, 2004
Messages
512
Re: Trim question.

Using the trim,one must watch the rpm's,speed and the way the boat acts.Each boat is different,even the same boat and motor.<br />As for as hard to steer,could be your touque(sp)tad might need to be adjusted.
 

Haut Medoc

Supreme Mariner
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Jun 29, 2004
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10,645
Re: Trim question.

I agree with Quietcat. 1/2 trim is way to high for high rpm. It puts the U-joints at too sharp an angle and will wreck them eventually......
 

QC

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Mar 22, 2005
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22,783
Re: Trim question.

Originally posted by J.kopec:<br /> I agree with Quietcat. 1/2 trim is way to high for high rpm.
Actually I was concerned about ABOVE 1/2 trim. I am assuming that his trim limit switches are correct and that he can operate at any RPM up to the top of the "trim" limit. He needs to be below 1000 RPM when going past that setting with the trailer button.<br /><br />The hard to steer thing still needs investigation. I agree that he may need to adjust the drive mounted trim tab if he has one. That's why I asked about power steering as the last two units I had with power steering do not hae a tab.<br /><br />Really we should be starting with more info on the boat. Year, model, engine year model, bhp, make etc.
 

CntrySngr

Petty Officer 2nd Class
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May 31, 2005
Messages
196
Re: Trim question.

1997 Maxum 1700SR with a Mercruiser 3.0 L Alpha one sterndrive, 135hp. No power steering from what I can tell...looks like its just cable?
 

kozman01

Petty Officer 1st Class
Joined
Jul 28, 2003
Messages
242
Re: Trim question.

Let me get this right. I should not trim higher than 1/2 way between the full "down" position and the full"up" position on my trim gauge? What do I do with the other "half" of the gauge indicating 1/2 to full "up" position? This trim thing has me quite confused anyways. I'm coming from an old outboard that had fixed trim. I could adjust it by pulling a pin and manually moving it, but this power trim is nice, I just don't know where i should be with it or shouldn't be with it.
 

CntrySngr

Petty Officer 2nd Class
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May 31, 2005
Messages
196
Re: Trim question.

Originally posted by Quietcat:<br />BTW, welcome! :)
Thank you QC!! I appreciate the welcome! I am learning a ton from y'all!! :)
 

prockvoan

Chief Petty Officer
Joined
Jul 27, 2004
Messages
512
Re: Trim question.

It all falls back to rpm's,speed and the way the boat handles.Your trim gauge feedback could be off.Chances are,you don't need to trim up that high.1/2 up is alot.
 

QC

Supreme Mariner
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Mar 22, 2005
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22,783
Re: Trim question.

CntrySngr,<br /><br />You probably do not have power steering then. You could be absolutely positive if there is no belt driven power steering pump that looks very similar if not identical to an auto unit.<br /><br />Let's assume that you do NOT have power steering. There is a vertical tab/fin at the end of your outdrive. Sticks down towards the prop and slightly behind it. It is mounted to a horizontal plate that "covers" the prop from above (anti-ventilation plate). This fin is there to help you turn the wheel and counteracts the propeller's desire to push the drive one way (without it your boat would steer very hard one way and too easily the other). Anyway it can be easily adjusted to see if that improves your issue without making some other point of operation unsafe or undersirable. What you will find is that there will be a new point of hard steering . . . Find a compromise that you are comfortable with.<br /><br />As far as trim is concerned for you I would not trim further up if it does not increase my speed. Basically, even though your guage says it is half way and your trim limit switch allows you to go there, it doesn't mean that it is helpful or deirable. Getting this type of stuff right can only be accomplished by exactly what you are doing: messing around. You will learn a lot that way. If you have a GPS you can get pretty dialed in, but you need to know that the next time somebody moves to new position in your boat or you bring along your 300 lb. Aunt Bessie, everything you have learned is kinda out the window as trim may need to be set differently for that new set of conditions. You should pretty much always trim all of the way down to get onto plane. That doesn't vary much.<br /><br />kozman1,<br /><br />Is this an outdrive? Outboard? Assuming that this is an outdrive, your gauge is not the ultimate decision maker, it is the true position/angle of the drive, and the behavior of your propeller and boat combo.
 

CntrySngr

Petty Officer 2nd Class
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May 31, 2005
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196
Re: Trim question.

Thanks again QC. I did notice an increase in speed when I trimmed it up...went from 35mph to 45mph...but again, couldn't steer. I will look tonight at the plate and see if I can tell what you are talking about.
 

QC

Supreme Mariner
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Mar 22, 2005
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22,783
Re: Trim question.

Originally posted by CntrySngr:<br /> ...but again, couldn't steer.
As I read this and your original post I realize now that you are having a hard time steering either direction? The little skeg/fin trim tab thing will probably not help then. Hopefully this post activity may atract somebody else with that combo. I had that engine, but not that drive. Sounds more now like something is binding when you are trimmed up. What happens when you steer it on the trailer trimmed 1/2 way? Full up?
 

tommays

Admiral
Joined
Jul 4, 2004
Messages
6,768
Re: Trim question.

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<br /><br />when your on the trailer the up trim limit should be 20-3/4 inches between the the rods holding the trim cylinders as shown in the photo<br /><br />and higher that that should require the use of the trailer button and the motor really should not be used above this level unless its some type of emergency very hard on the u-joints<br /> <br />the trim normal trim limit of 20-3/4 is way to high to do anything but run slow in shallow water<br /><br />tommays
 

QC

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Mar 22, 2005
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22,783
Re: Trim question.

Originally posted by tommays:<br /> <br />the trim normal trim limit of 20-3/4 is way to high to do anything but run slow in shallow water<br />
I don't want to contradict you tommays, but light boats can run well trimmed up there. My last boat was a very light 20 footer. Like a bass boat, but a bowrider. I could run full trim limit at WOT and it really flew. Threw somewhat of a rooster like an OB, but ran and sounded great. When you think about it, full down is a similar angle for the U joints just the other way, and nobody stresses about that.<br /><br />I also rarely run mine in the trailer postition, but Merc actually does allow it below 1200 RPM. Totally agree that it is tough on the U joints and should be avoided.
 

CntrySngr

Petty Officer 2nd Class
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May 31, 2005
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196
Re: Trim question.

Originally posted by Quietcat:<br />
Originally posted by CntrySngr:<br /> ...but again, couldn't steer.
As I read this and your original post I realize now that you are having a hard time steering either direction? The little skeg/fin trim tab thing will probably not help then. Hopefully this post activity may atract somebody else with that combo. I had that engine, but not that drive. Sounds more now like something is binding when you are trimmed up. What happens when you steer it on the trailer trimmed 1/2 way? Full up?
I will try to check tonight. I couldn't tell what you were talking about last night, but now that you say it wouldn't help, I will not pursue further. With it trimmed all the way up for the trailer it steers fine. It's only when I am at 1/2 that I couldn't do it. I'll also play with it this weekend on the lake to see if I can figure it out.
 

tommays

Admiral
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Jul 4, 2004
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6,768
Re: Trim question.

Cntry<br /><br />i was out playing today i have a 3.0 lx in a maxum also without power steering<br /><br />i tryed triming up high like you were talking about and found it very hard to steer the boat at the higher trim levels and went back to my normal just enough to lift the bow<br /><br /><br />tommays<br /><br /><br />tommays
 

CntrySngr

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May 31, 2005
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Re: Trim question.

Okay, so I went back out on the lake today (fishing wasn't that great, but we went late because I was dealing with yet another Kidney stone...thank God this was a small one!) I got to plane and trimmed it up, RPM's increased, got to 43-45 mph, forgot to look at RPM's...oops! Anyway, I was able to steer it, it was hard to steer, but I was able to do it. Also, trimmed up like that we hit a few big waves (wakes) that had us out of the water completely once or twice. Kind of fun, but I'm not comfortable with that yet...still getting used to the boat! ;) <br /><br />Anyway I was able to steer it...just really stiff.
 

prockvoan

Chief Petty Officer
Joined
Jul 27, 2004
Messages
512
Re: Trim question.

Next time,look at the RPM's= speed.You should have an emengence kill switch,hook it up to yourself if you are not wearing a PFD.
 

CntrySngr

Petty Officer 2nd Class
Joined
May 31, 2005
Messages
196
Re: Trim question.

I had the kill switch hooked to my belt loop...and we usually wear PFD's when we are underway, but thank you for the reminders!! :)
 
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