Lama V3,. sluggish rotation left - HeliFreak
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Lama V3/V4 and Kob E-Sky Lama V3 and V4 and Kob

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Old 08-12-2009, 12:27 AM   #1 (permalink)
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Join Date: Aug 2009
Location: Sweden
Default Lama V3,. sluggish rotation left

I have noticed my V3 rotates very poor to the left. Doing right turns it spins rapidly but left is very sluggish. Right/Left and Back/Forward works fine. HEli flies fine in every other perspective.

Also I have noticed that the lower blades stop sooner after throttle is pulled down to zero. They are not spinning as easy as the top blades. I have looked at all joints and stuff and everything seems to go smoothly. A week ago my lower blades motor stopped and I had to replace it. Could there be a bearing that is starting to give up? Could something be to tightened?

Regards Jonas
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Old 08-12-2009, 01:34 PM   #2 (permalink)
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Location: St. Paul, Minnesota

Hi Jonas.

This can be caused by the Proportion needing adjustment, which is often the case after changing motors.

The Proportion adjustment is to match the power output of the motors.

With a freshly charged battery, and the rudder trim centered, hover the V3 and center the rudder input.

The V3 will rotate to the left or right.

Land, disconnect the batt and adjust the Proportion a small amount. It doesn't take much.

Connect the batt, hover again and see if the adjustment sped up the rotation or slowed it down. Then re-adjust the Proportion.

With the Proportion properly adjusted the V3 will sit in a hover with no rotation with little or no rudder trim needed.

Once the Proportion is properly adjusted, you will probably need to reset the Gain too.

To adjust the Gain, add positive Gain until the tail starts to "hunt" back and forth.

Then back off the Gain a tiny bit at a time until the tail stops "hunting".

You must unplug the batt each time you make an adjustment to the Proportion or Gain, otherwise the 4 in 1 will not reset to the new settings.

It takes some patience, but it is possible to fine tune them to the point that your V3 will be stable in a hover with little or no control input.

BTW, a co-axial heli will always spin to the right, faster than it will to the left. This is because the lower motor speeds up to spin the heli to the right, and slows down to turn to the left. This is also why the heli climbs during a right turn, and drops in a left turn.

Feel free to ask any questions you have!
- Jack
Cranky old fart and charter member of ESO
Lots of Helis
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Old 08-12-2009, 03:29 PM   #3 (permalink)
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Join Date: Aug 2009
Location: Sweden

Thank you for a great reply! However, the proportional and gain trimming is done and ready Your last rows in the reply seems to answer my question though. Rotation is different due to the co-axials design.
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