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Blade CX2 wants to "rudder" to the left... Binding bottom rotor?

Old 09-05-2008, 02:33 PM
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Lieutenant Loughead
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Default Blade CX2 wants to "rudder" to the left... Binding bottom rotor?

Hey guys. I've had my Blade CX2 for 9 months, and I'm embarassed to say I finally had a mishap during my 70th flight...

I was trying to "spot land" on a cardboard box, and she fell off the side of the box -- a 30-inch drop to the carpet. The damage seemed superficial -- I broke one-inch off the the tail boom of my MD500 fuselage... Not even a broken blade!

I picked her up, and flew her around for a few more minutes -- no big deal.

However, the next day, when I went to fly her again, I noticed that she wanted to rotate (rudder) to the left all the time. I landed, and noticed when applying throttle, the top rotor would begin to turn long before the bottom rotor. When closing the throttle, the bottom rotor would stop rather quickly (when compared to the top rotor).

So, I took her apart, and examined her. I couldn't see anything that could be binding that bottom rotor... There's an "outer shaft retaining collar" (part #20) on the shaft, just above the "main frame" (part #30) -- the "outer shaft retaining collar" seemed kind of tight against the "main frame", so I moved them apart a little... I put her all back together again, and she still pulls to the left... (Bottom rotor still seems like it's binding.)

Can someone give me some help in fixing this? :o I'm a bit new to repairing my heli... :o

Thank you!
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Old 09-05-2008, 04:15 PM
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theecoop
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can you take image of head 3 views, might help solve faster
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Old 09-05-2008, 04:15 PM
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HeliG
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Lt., It's about time you crashed that thing!

You are going to have to do some step by step problem solving.
1. Did you bump the trim on the TX?
2. Take the motor off that runs the lower blades. Try to spin it. Is it binding? If not, it is probably the motor that is binding.
Based on your comment about the tight retaining collar, I think this is where the problem is. Check there and see if you can fix it. While you are stripping things down, you should take the time to clean and lube everything as well.

Let me know if you need more help.
Warren.
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Old 09-05-2008, 07:53 PM
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Ugh -- I was hoping that I wouldn't have to take the whole darned thing apart...

Originally Posted by theecoop View Post
can you take image of head 3 views, might help solve faster
Sill me -- I'm not really sure what a "head" is... :o
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Old 09-06-2008, 02:12 AM
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The rotor assemble is called the head
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Old 09-15-2008, 06:51 PM
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Well, I took the whole darned thing apart last Saturday, and inspected everything...

I couldn't find whatever was causing the binding...

I put the whole thing back together again, and everything is now PERFECT...

I don't know what I did, but it's fixed.
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Old 09-15-2008, 07:17 PM
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congrats on getting it fixed
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Old 09-25-2008, 02:51 AM
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Guess i will try the same i just bought mine used a couple weeks ago and it does the same thing it kinda goes of to the left and back goes in a small circle will not hover
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Old 09-30-2008, 02:58 AM
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There is a steel collar with a set screw fastening the bottom drive gear to the shaft (the collar is just above the battery). If it gets loose or remounted improperly it may or will slip causing the respective rotor to not produce thrust and torque to compensate for the other rotor. I've also had motor wires break.
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