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Crashed S107G spins on it's axis
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azhag
Warsaw, Poland
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June 12, 2012 - 2:36 am
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Hello Houston, we have a problem.

Yesterday I crashed my S107G. I didn't look bad (at least with comparison to my previous crashes ;)), but turned out to be grave. While hovering heli spins moderately on it's axis, and when I rotate it with remote to left or right it starts to spin like hell and drops down. It looks like on this video of gyro mod by Raptor with gyro turned off, so guess I've damaged my gyro (all mechanics seems fine).

 Is there anything I can do about it?

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Supernova
England
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June 12, 2012 - 2:40 am
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Have you looked at this video ?

It says, say something here --- so I have

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azhag
Warsaw, Poland
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June 12, 2012 - 2:46 am
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Yes, I have. Main shaft is intact.

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Supernova
England
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June 12, 2012 - 2:54 am
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Hmm well Have a close look at the motherboard to see if there is a problem in the solder joints.

It says, say something here --- so I have

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azhag
Warsaw, Poland
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June 12, 2012 - 3:32 am
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I can't see any. But maybe your eyes are better, here are some photos of top and bottom side: http://dug.net.pl/~azhag/s107_board/

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Raptor
Cheshire, England
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June 12, 2012 - 3:48 am
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there are a few potential causes, but the fixes mostly involve soldering.

When you power it up, do both of the blades spin?

 

If they both spin as they used to, then the problem is with the gyroscope's connection.

I would suggest that you get a soldering iron, and re-heat the solder, it is possible that a micro fracture has formed it in (dry solder)

 

p.s. nice, crisp images

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 4:24 am
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Raptor said
When you power it up, do both of the blades spin?

 Yes.

 

Raptor said

If they both spin as they used to, then the problem is with the gyroscope's connection.

I would suggest that you get a soldering iron, and re-heat the solder, it is possible that a micro fracture has formed it in (dry solder)

OK, but where exactly gyroscope is located at? In other words: which joints I should re-heat first?

 

Raptor said 

p.s. nice, crisp images

Thanks 🙂

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Raptor
Cheshire, England
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June 12, 2012 - 5:49 am
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the gyroscope is the little board that sticks up at the front of the helicopter.

the impact, could have caused any one of the solder points to have broken, so i would suggest that you heat up all 3 of the blobs within the blue circle.

Image Enlarger

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 6:18 am
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Thanks.

 

Unfortunately that didn't helped. 🙁 

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Raptor
Cheshire, England
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June 12, 2012 - 6:32 am
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do you have a voltage tester/multimeter?

 

Image Enlarger

if so check the voltages between the small solder points (left of the image) and the large solder point (right of the image).

Turn on the helicopter,

check the voltage between the top left pin and the right pin should be about 1.3v

check the voltage between the bottom left pin and the right pin should be about 3V

 

if either pin shows as 0V, then that would be the source of the problem.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 6:44 am
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I've got 3.46V on top pin and 1.33V on bottom pin, so it's other way around. But at least it isn't 0V. 🙂

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Raptor
Cheshire, England
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June 12, 2012 - 6:48 am
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In that case your gyroscope is fine.

I'm not sure what else could be causing the spin then.

 

However, I will have a look into what else could be causing the problem.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 6:52 am
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Raptor said
 

However, I will have a look into what else could be causing the problem.

 

Thanks a lot, I appreciate that.

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Raptor
Cheshire, England
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June 12, 2012 - 7:02 am
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Image Enlarger

Try testing to see if there is any voltage between these 2points.

It should be 1.33v

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 7:16 am
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Close enough: 1.31V.

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Raptor
Cheshire, England
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June 12, 2012 - 7:38 am
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In that case, i don't think its the gyro that's at fault then.

 

try holding the helicopter firmly in your hand, and give it full throttle.

push the steering stick to the left. you should be able to feel the helicopter trying to turn left.

try it again while pushing the stick right.

 

if you cant feel it trying to turn in either direction, it could be an issue with the motors.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

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azhag
Warsaw, Poland
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June 12, 2012 - 5:36 pm
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It turns both left and right.

Later I'll try to make a video of how my helicopter flies.

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azhag
Warsaw, Poland
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June 12, 2012 - 8:02 pm
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azhag said
Later I'll try to make a video of how my helicopter flies.

Here it is: 

First it spins moderately to the left while hovering. Then when I pushed stick to the lef it started to spin to the left very fast and dropped down, and when I pushed stick to the right it started to spin very fast to the right and dropped down again. 

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bvc
Houston, Texas
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June 13, 2012 - 7:54 am
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Check the rotor head again and make sure the screws that hold it on the main shaft actually tighten down and that one is tightened down onto the flat part of the main shaft. My S800 did a very similar thing and it turned out the screws could not be tightened because where the screws went in the rotor head were cracked. I super glued them shut and it works.

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azhag
Warsaw, Poland
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June 13, 2012 - 4:48 pm
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That was my first shot. And since the crash I already stripped down the head a few times -- screws are tightened.

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