Wings crashing into each other - need advice | General Syma S107 Information | Syma Forum
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Hi there,
Hoping someone with lots of experience can help me out with a problem we're having. At first, S107 flew fine. But now on takeoff, once the copter starts to wobble a bit the blades from the top set will crash into the blades from the bottom set, obviously causing a crash.
I have a full set of replacement parts but nothing is obviously broken. I tried swapping out the connect buckles as one time such a crash caused one of them to disconnect, but that didn't help.
Here's a hint: if I spin the rotors while holding the copter in my hands, the spin planes of the wings seem just fine. It's only when the copter starts to wobble that I have this problem.
Advice will be much appreciated!
Thanks,
Michael
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This link on the forum might help,Supernova has a video up on it
http://syma107.com/forum/gener…..ade-issue/
Let us know if that is your problem,also welcome to the forum SF 
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a trick i've started using recently:
-remove the main shaft from the helicopter
-find a suitably hard surface
-using your thumbs, push the main gear down the shaft so the bottom of the plastic is flush with the bottom of the shaft
i've found this extends the top blades a few mm's higher and it isn't necessary for the bottom of the shaft to be inserted into the plastic hole
good luck! let me know if a pic would help
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hope this helps! just push the gear down until the bottom of the shaft is flush with the bottom of the gear
this leaves enough knurling inside the gear to still grip, and gives you a little more clearance for those sharp, banking turns 
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So now that it is Xmas season I found someone selling them in a mall and they pointed out to me that the little black plastic posts that stick into the top wings from the main shaft were broken off. The link the first reply above posted was indeed the problem! I am amazed the thing could even get off the ground that way, but OK.
Thanks to everyone who helped me out with advice.
One thing was very interesting after putting things back together after swapping in a replacement part. There's a small metal tube that slides around the main shaft and sits between (and I presume holds even the space between) the top and bottom wings. I could not get the screws that secure the top wing to the shaft to grab hold of the flat groove in the shaft for the life of me. But when I left off that metal tube, it fit fine. Seems that the metal tube just couldn't get seated properly enough for everything to fit back together right. Everything seems to work OK without this metal shaft.
Has anyone else had experience flying the S107 without this metal shaft in place? Is this OK or do you think it's a terrible idea?
Happy Holidays!
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That peice doesn't really do much performance wise, but it helps to guard the upper main shaft from getting bent. I had this happen on my s102g a little whie back. Loosen one screw, swap the tops of the main shafts, swap everything else around. Done. Don't actually have to replace the whole main shaft and take anything apart.
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