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Possible Trim problem?
Tags: Syma X9
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ka7ple
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July 13, 2011 - 4:45 pm
Member Since: June 23, 2011
Forum Posts: 8
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Hi All,

I've been flying my S107 about 3 to 5 times a day almost every day now. I usually get about 8 min of flight before any power loss. I am now only getting 6.5 to 7 min of flight. As I'm flying around the house I noticed that I am having to trim either right or left spin more often. It still fly's very accurately, after I trim it. But after full forward flight I just have to touch up the trim again.Could this be due to the battery becoming weaker? Or do I have another problem?

I also noticed a little bit more noise from the gears. Both rotors still turn smooth by hand and I can't see any problems with the gears. This may be to the fact that I'm flying a lot and may just be normal wear.

Any ideas, is this something I should be worried about?

 

Thanks,

Ka7ple

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Syma Freak
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July 14, 2011 - 2:03 pm
Member Since: November 26, 2010
Forum Posts: 1459
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@Ka7ple you could try putting some teflon on your gears like Dupont-but I mean a small amount like a drop or two post here-your battery could have been hammered if you did not wait 10 minutes between flight and charging to let battery cool down-any bad crashes?

"Fly like a butterfly sting like a Syma" http://syma107.com

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ka7ple
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July 14, 2011 - 4:09 pm
Member Since: June 23, 2011
Forum Posts: 8
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Just one really bad crash, but that happened a long time ago. I hit a beam in the roof, bounced off the cupboard, hit the fridge and then the kitchen floor. I expected to find pieces. The only thing that broke was a crack in the horizontal tail trim piece.  Did not affect the performance.

I have drilled into the ceiling a couple of times, but recovered before it hit the floor. And a couple of blade strikes on a chair or table with no damage. If I think I am going to crash I just dump the throttle.

When it's up it fly's great, (except for now having to trim it all the time) I am beginning to think this is a battery issue. I am having to give it more throttle to lift off the deck, and not as much power to get out of trouble when I need it. I do wait 10-15 between flight and charge, and also between charge and flight. I do have over 125 flights on it. I don't know how long these batteries are suppose to last. 

I have some very light oil used in gears for electronics like VCR's Camcorders Etc. I could try that.

 

Thanks for the input,

Ka7ple

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ka7ple
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July 14, 2011 - 6:30 pm
Member Since: June 23, 2011
Forum Posts: 8
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I just figured out what the problem is. There is some resistance on the lower rotor when I turn the blades by hand. I don't believe its any of the gears, they all look ok, and there does not seem to be any thing bent or out of place. It all looks strait. So that leaves the motor. I will take the frame apart later and see if that is actually the problem.

The two motors look the same, I can't see any difference between the "A" motor and the "B" motor other than the color of the wires. Which one is the front motor? I would assume it's the "A" motor. Or does it really matter?

I will get a replacement when I can, along with a fresh set of main blades. Mine are a little nicked, but not broken.

 

Ka7ple

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Syma Freak
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July 16, 2011 - 2:29 pm
Member Since: November 26, 2010
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@Ka7ple keep me posted what repairs you are doing-wiring important on motors when re soldering

"Fly like a butterfly sting like a Syma" http://syma107.com

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sixstringartist
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July 17, 2011 - 7:00 am
Member Since: July 17, 2011
Forum Posts: 2
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Just for your reference, 

 

The front motor, lets call it motor A, controls the lower blade (the counter-clockwise rotation of the gyro. Motor B or the back motor controls the upper blades or the clockwise rotation. These motors are identical except for the direction of their drive so it IS important that they are in the correct position. If you decide to replace either or both, you need to be sure to get the correct motor.

 

NOTE: I am assuming motor A is front and motor B is back. Syma replacement parts use A and B notation to distinguish the motors but I have not been able to determine if they too consider the front motor to be motor A.

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ka7ple
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July 17, 2011 - 3:19 pm
Member Since: June 23, 2011
Forum Posts: 8
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Ok Thanks,

Knowing that both motors are the same, it will be a simple issue to replace it. As for soldering, I have been building radios (ham radios) for 30 years, so no big deal there 😉 I don't see any electronics on the motor itself so if I get it backwards, it will just spin the wrong direction, and I will swap the leads.

It's gonna be a while before I can do any repairs I have some other priorities to take care of first.

Thanks for all the info, should make getting this bird flying again pretty simple.

 

Ka7ple

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