Hi, I have a Blade CX2 that has started spinning left even with full right rudder. Can I assume that the problem is due to the one rotor turning too slow because of a faulty motor or ESC?
Thanks for any help, Mick

You can assume that one rotor turning too slow because of a faulty motor or ESC; however, you should check to see that you have the wires for your motors connected in the correct place and polarity. You can check this by how your rotors turn. Blades should spin faster in the direction of your rudder input (right=bottom/left=top). Check to see that nothing is binding with the bottom rotors (i.e shaft bent, gear rubbing aginst something, etc.). That should help with that problem. Hope everything works out.

Thank you very much for the help.
Yes, all the connections and rotations are correct. There is a good possibilitly of damage though, so I will dissasemble and check for that before pursuing the motors and ESC.
Thanks, Mick

Here are some steps to help diagnose the problem.
Note:
Lower rotors/shaft turns Left
Upper rotors/shaft turns Right

1. Check your locking screws on the upper hub and mid locking collar. Make sure that they are not slipping.
2. Check for bent shafts. Bent shafts can cause resistance in rotation.
3. Check Gear-mesh and gear teeth. Tight Gear-mesh also cause resistance, broken teeth will cause slipping.
4. Check your blades. Warped or bad blades will cause this.
5. Then reset your trim and proportional gain to the center.

Blades will cause this problem more then half the time. Make sure that you change and test different sets on the upper and lower. D@mn blades are always a trouble. Even after you check, boil, #match, balance and track they still sometimes have bad ones, and no two sets will every fly the same.

Here are some links to help you with the list above.

Quattro1975’s Bents Shaft Repair
http://www.rcuniverse.com/forum/m_6791546/tm.htm

Gear Mesh Guide
http://www.rcheli411.com/pages/howto.php?howto=7&page=2

Eat2muchrice’s Warped blade test
http://youtube.com/watch?v=_7PwNTXOWMs

Eat2muchrice’s Blade boil fix
http://youtube.com/watch?v=RmNv8OlG6GQ

RCFEIND’s Balancing Blades
http://www.youtube.com/watch?v=15h9G...eature=related


If it still does this then change out your bearings, if its not your bearing then change motors. I’ve heard of stock motors running over 400 flights. If you fix your problem and then your ready for more, check out this link.

Tips/Repair/Guides/Mods Links
http://www.rcuniverse.com/forum/m_68...tm.htm#6821632

Good Luck and Have fun.

Thank you very much for the excellent detailed reply, I will save it for future reference.
The problem turns out to be a stripped inner shaft gear.
Thanks, Mick