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Hello from London
Loss of power for take off
Tags: Syma X9
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perroazul
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November 24, 2012 - 2:48 am

Hello, I've been flying my S107 happily for a year now, having in the meantime changed the battery and some blade parts as well, all thanks to your great forum!

Recently, my little heli would no longer take off, even with a fully charged battery. Just to make sure the battery was not causing this, I just fitted a new one. But unfortunately no success. The shaft is not bend either, although I notice that it shifts up 1 or 2 mill when it starts rotating, but that might have been the case before, I am not sure. I have also changed the controller's batteries.

Despite the blades rotating at full speed, the S107 hardly takes off. I could not seem to find that problem on the forum, so if anyone came across this, I would appreciate your help.

Many thanks.

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CPD
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November 24, 2012 - 3:53 pm

Uggg... got logged out as I was hitting post reply and it didn't post...

 

Well, it sounds like you have one obvious problem, and possably a hidden and harder to fix problem. First, the blades going up and down is a dead giveaway that the gears have slipped down in the shaft, and could be causing gear slip. It's a simple fix with a video listed  in the "frequent problems and how to fix" section. All you need is a small (preferably jewler's/electronics) flathead screwdriver. Just look over there and find the video, and follow Super Nova's instructions.

 

Now, after that, try it out and reply with the results. If the gears have slipped down, then they might be slipping, loosing their grip, and while you might think the blades are at full speed, they might be at almost a stand still relative to flight speed. If they aren't slipping, you'll have needed to fix them being down too far anyway, so it's not wasted time in any way shape or form.

 

Now, if it does not work. crack it open (not literally) and look at the battery. Heck, look at the battery even if it does work. If it's bloated or soft, or worst case, leaking, then that's obviously a problem.

Either way, stick around--we're not just about repairs here. That's our bread and butter, but that's not the only thing we do around here.

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perroazul
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November 26, 2012 - 5:28 am

Thank you very much for your reply.
You were right, it was the gear slip that caused the problem, and I followed the info from the recommended video.
I actually ended up taking the whole thing apart to understand what was going on in there!
All is fine now, and I even put back my 240mAh battery which I thought was the problem.

Now, one thing I wonder about. After a few minutes of flying, when the battery starts getting weaker, the helicopter won't ascend very well, but if I help a little bit by holding it half way up in the room it actually goes all the way to the ceiling very easily! Is this something that has to do with the air being warmer further up?

Thank you once again for your help with this forum and all the videos! The internet can be beautiful!

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CPD
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Guests
November 26, 2012 - 1:45 pm

Great to hear that was the issue! (Especially considering it's a free fix, instead of a $5 battery)

That last part's not an issue, that's actually a critical part of the physics of  a helicopter. It always takes more energy to lift off than it does to fly. I'm not sure of the exact mechanics of it, but I know that if I read through and refreshed on it, I would probably take up all of SF's bandwidth. Basically, when it's in the air, the blades can push the air straight down and keep it going, when it's on the ground, you get a lot of prop wash, which while in the air gives more lift, when on the ground, it disapates the airflow and thus the power.

 

Now, what you can do when you don't have the power to go straight up is a little trick that real helicopter pilots use when overweight--Transitional Lift. When your overweight or running low on power, you can jam it into full foreward, and it will gain momentum and lift, but if you stop going foreward, you loose the transitional lift, and drop. It is a really fun and cool thing to try, and takes a lot of skill (and room) to perfect. Works best on a lanolium floor with these guys, but carpet with a military heli will also work. (the 107's tend to get their skids caught in carpet when trying it, and wood will work too if it's perfectly flat, not notched or otherwise milled to a decorative shape--the skids or wheels could get caught in dips and whatnot, flipping the heli into a nosedive)

 

I would post a link to a really good video, but the Smithsonian Channel doesn't like people having up bits of their shows, and the part I want isn't on youtube. But, this one will do too.

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perroazul
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Guests
November 26, 2012 - 10:25 pm

Thanks Chris for sharing the knowledge!

But, as you quite rightly pointed you, one does need a lot of room to practice transitional lift!

I already noticed that I could gain altitude by going full forward and circling around.

Having said that, I am still puzzled by the fact that after less then 2 minutes of flying, and despite a new battery, I can't take off anymore. It seems to me that that wasn't always the case. The gears still slip up and down, but I don't know how much they are supposed to do before it becomes a problem. I've taken it apart again to try to reduce the shift as much as possible, but without much success. Also, when looking at the shaft and powering on, it seems to me that it moves a little left to right. All very tricky, it is difficult to know how much this all affects the flight.

Maybe it is time to replace the shaft and the gear?

Dom.

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