Mechanical Adjustment of Servo Linkages for Stable Hover
To adjust the servo arms mechanically, means you
trim the heli by lengthening or shortening the servo linkages. Instead of using
the trims on the remote controller. Doing it this way preserve the full servo
throws. Both forward and backwards.
Perhaps others could chime in on better step by steps...but here is a summary of what I do when I first get a heli.
Step 1a: Reset the remote control's electronic trim back to neutral.
On the 9958 remote, it's about 15 clicks from the endpoints. You can tell when your remote's electronic trim is neutral when you hear a long beep. Note: Only the throttle, elevator and aileron has a neutral trim position. I don't think the rudder does.
Step 1b: Adjust rudder
Rudder trim is responsible for the heli spinning left or right.
Start by giving throttle to get your heli in the air. Ignore the forwards/backwards or any tendency of the heli to slide left/right. Use the rudder trims on the remote to get the heli to stop rotating. Once the nose of the heli is pointed in one direction, you are ready for mechanical trimming.
Mechanical trimming
Step 2: Trim out the forward or backwards movement of the heli.
Pop off the servo linkage responsible for forward and backwards flight. You can simply move the remote stick forward and backwards to so you can determine which servo linkage is responsible for the forwards and backwards movement of the heli.
If the helicopter moves forwards. Then you have to lengthen the linkage to give it some backwards trim. Simply turn it counter clockwise to lengthen the linkage. I find that on the 9958, you can do a complete full turn or half turn. How many turns clockwise depends on how much trim you need. Just roughly guess. I'll start with 5 complete turn if there's a lot of forward momentum.
Conversely, if you the helicopter moves backwards. You shorten the linkages by simply turn the linkage clockwise.
Step 3. Trim out the left or right movement of the heli.
The concept is the same as the above.
If your heli is moving too much to the left. Twist counter clockwise to lengthen the servo linkage.
Conversely, if your heli is moving too much to the right. Twist clockwise to shorten the servo linkage.
Done!
Eventually, you'll get proficient in doing this. It takes a few seconds for each step. And you'll be able to get your heli to hover in place, retaining the full, balanced throw of the linear servos.
From this point, you can use the electronic trims. Usually, very little is needed if at all. And you can electronically trim to compensate for battery voltage drop during your flight or for different battery types and sizes.
For outdoors flight, you can use the electronic trim to give more forward bias and still be able to go back to neutral position for indoor flight.
Anyways, the above is how I learn to do it. Not sure if it's correct. But it works for me. Hopefully others can add or give further insight into this.
-Daryoon
Perhaps others could chime in on better step by steps...but here is a summary of what I do when I first get a heli.
Step 1a: Reset the remote control's electronic trim back to neutral.
On the 9958 remote, it's about 15 clicks from the endpoints. You can tell when your remote's electronic trim is neutral when you hear a long beep. Note: Only the throttle, elevator and aileron has a neutral trim position. I don't think the rudder does.
Step 1b: Adjust rudder
Rudder trim is responsible for the heli spinning left or right.
Start by giving throttle to get your heli in the air. Ignore the forwards/backwards or any tendency of the heli to slide left/right. Use the rudder trims on the remote to get the heli to stop rotating. Once the nose of the heli is pointed in one direction, you are ready for mechanical trimming.
Mechanical trimming
Step 2: Trim out the forward or backwards movement of the heli.
Pop off the servo linkage responsible for forward and backwards flight. You can simply move the remote stick forward and backwards to so you can determine which servo linkage is responsible for the forwards and backwards movement of the heli.
If the helicopter moves forwards. Then you have to lengthen the linkage to give it some backwards trim. Simply turn it counter clockwise to lengthen the linkage. I find that on the 9958, you can do a complete full turn or half turn. How many turns clockwise depends on how much trim you need. Just roughly guess. I'll start with 5 complete turn if there's a lot of forward momentum.
Conversely, if you the helicopter moves backwards. You shorten the linkages by simply turn the linkage clockwise.
Step 3. Trim out the left or right movement of the heli.
The concept is the same as the above.
If your heli is moving too much to the left. Twist counter clockwise to lengthen the servo linkage.
Conversely, if your heli is moving too much to the right. Twist clockwise to shorten the servo linkage.
Done!
Eventually, you'll get proficient in doing this. It takes a few seconds for each step. And you'll be able to get your heli to hover in place, retaining the full, balanced throw of the linear servos.
From this point, you can use the electronic trims. Usually, very little is needed if at all. And you can electronically trim to compensate for battery voltage drop during your flight or for different battery types and sizes.
For outdoors flight, you can use the electronic trim to give more forward bias and still be able to go back to neutral position for indoor flight.
Anyways, the above is how I learn to do it. Not sure if it's correct. But it works for me. Hopefully others can add or give further insight into this.
-Daryoon
Mechanical Adjustment of Servo Linkages for Stable
Hover
http://www.rcgroups.com/forums/showpost.php?p=19930341&postcount=1
-Daryoon
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