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Old Jan 01, 2015, 12:09 PM
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Joined Nov 2014
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Help!...V911 tail rotor problem

I am a complete novice. I've flown my V911 maybe 1 hour total. After sitting idle for a week I took it out to fly and the tail rotor won't start rotation until almost full throttle. (I handheld it while throttling up). Is this a recalibration issue? Failed rotor motor? Please help!
Thanks!
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Old Jan 01, 2015, 12:22 PM
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Yorkshire, UK
Joined Feb 2007
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If you're holding it motionless in your hand it very likely won't turn. It only rotates when it needs to. Have you tried flying it?
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Old Jan 01, 2015, 12:57 PM
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Joined Oct 2014
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I've got a couple 911's. Both spin up the tail rotor with very little throttle.
You didn't bang the tail motor real hard did you?
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Old Jan 01, 2015, 01:11 PM
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Joined Jan 2013
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There is a common problem that happens when crashed ,the tail motor wires pass through the middle of the tail spar ,these wires are not insulated by plastic coating but by very thin enamel ,this enamel can be scraped off and short out the wires, near where they enter the tail spar at the rear is the most common place ,if you are lucky it won't have damaged the cuircit board yet but if this is the problem and you persist it will burn out the components on the cuircit board so check now !.
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Old Jan 01, 2015, 06:16 PM
Crash and learn
United States, PA
Joined Dec 2011
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Replace the tail motor. There are brushes (electrical contacts) inside the motor that alternate the magnetic fields. The contacts get dirty or burned. Then sit idle for a week and corrosion starts. It never will get better. One hour in the air is a long time, but normally not a problem unless you overheat the motor. Kiss the motor or touch it to your nose to tell how hot it is. Blow into the tail rotor to make it spin and listen to the sound.

Still, you may get lucky. Remove the tail rotor (propeller) and imagine that there is hair or spider webs or whatever wound around the motor shaft (metal). Scrape this off going from motor outward. Replace the rotor.

"Recalibration" - Place the V911 on a flat level surface. Insert the battery. Quickly (within seconds) turn the transmitter on. This resets the electronic gyroscope inside the helicopter to see the flat level surface as the ground zero starting point. You have to do this every time you insert the battery.

You can test the gyroscope by hand hold the helicopter and run the motors. Rotate the V911 counter-clockwise and the tail motor speeds up. Rotate clockwise and the tail motor slows or stops. Yes, you first have to have a working tail motor.
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Old Jan 02, 2015, 09:46 AM
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Tucson, Az
Joined Feb 2007
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Buy a tail motor and get another bnf.. geezee $20.00 heli. Tail wires are very thin and have to be soldered. Tail motor is hard wired to board. Not hard to do but many don't like to solder. Having two will make them last longer as you do not need to fly back to back with just one bird.
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Old Jan 02, 2015, 04:12 PM
Crash and learn
United States, PA
Joined Dec 2011
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Tail motor most times can be replaced by cutting the wires at the tail motor itself, then use same wires to connect new motor. Solder wires, then coat with nail polish to insulate and fix in position for crash protection. Not recommended, but some people scrape the wires clean, twist together and do not solder.

Tail assembly. This makes it easier, except the old tail boom likely glued to frame and hard to remove even with the solvent.
http://www.banggood.com/WLtoys-V911-...-p-918956.html

Fisheye swashplate and carbon main shaft. Worthwhile improvement
http://www.banggood.com/WLtoys-V911-...-p-952661.html
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Last edited by Ribble; Jan 02, 2015 at 05:06 PM.
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Old Jan 03, 2015, 02:39 PM
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Joined Nov 2014
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First thing to check is that the tail rotor moves freely. You should be able to make it rotate when you give it a light blow with your mouth.
If it does not rotate freely, the rotor might be pushed in on the shaft. Just pull it slightly out. Be careful not to bend it.
If the motor still don't move freely, then the motor is probably damaged.
It sounds unlikely that there is something wrong with your wiring since it moves with more throttle.
However, it is a good idea to protect the wires going in to the motor with a little bit of glue.
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