Syma Forum

I wouldn't run rechargeable batteries in your transmitter since it is not rated to be able to run at such low voltages and can cause damage. Take note that rechargeable AA batteries only produce 1.2v where as an Alkaline non-rechargeable produces 1.5v and since the transmitter has the batteries in a series circuit it compounds the problem into a 1.8v reduction. If you ever used your transmitter to recharge you heli with those rechargeable AAs in it may also have caused other issues.

I don't think the transmitter is what causes this problem, I think as the batteries get a little old, they start to burst a little and drop at some points. I'm not sure how to remedy the problem. I know there's some electronic part that will normalize the voltage by eliminating the spikes, but I forget what part it is. I want to say bridge rectifiers but I just don't remember anymore.

My second s107 arrived the other day, tried the remote and the heli fly's great. I noticed that on the the remote with the problem, that if I put side pressure towards the left while operating it, the heli fly's without a problem. I appears that the variable resistor pot that senses the throttle position is the problem.

I also replaced the throttle return spring with a lighter spring and it works great with a great feel, and it returns to off when I let go, so I don't have to remember to place it in zero position when it crashes. Next move is to see what I can replace the throttle pot with. Have to determine the value and case size and see if can be replaced.

I have a S107G that is two days old, at first it flew fine but near the end of the 1st. day while trying to maintain a constant altitude there would be a burst of power and it would cause to Helli to hit the ceiling. It appears to be in the remote, while moving the stick forward giving it power to reach the desired height it would surge, I would then back off the stick to counter this and then gently push forward and the same thing would happen again.

There used to be a sweet spot on the controller where if you hold it in that position the Helli remains at a given altitude, the sweet spot seems to be gone, its like my controller has become too sensitive in a certain spot (approx. half throttle). Batteries on remote are good.

Has anyone experience this problem?

The things that I will look at will be, when parts come in are,

1. Battery on Helli

2. Controller board on Helli.

I have another Helli on the way and when it arrives I will try the remote on that to determine if the problem is in the Helli or remote.

You guys are a little too new to know the whole back story on the hybrid 107 (s107h or h107g?)

It was a fake heli, one motor burned out, somebody returned it, it was rebuilt with a real motor, battery, (I think) canopy, and blades, (and possably other parts) then was packed up and sold on amazon to me. It's a great heli, very durable, has a few minor issues like sliding, and some minor tbe that comes and goes, but it's a fun heli. Not the smooth glider like the 102, not the speed demon like my speed-demon modded 107.

It was odd that it only did it on one flight. I've charged the AA batteries, so if that's the issue, it won't come back.

(the speed one has a thin plastic lower frame, the skids weren't any good because the originals were on the hybrid and these ones were trashed, so they're just the plastic frames, and a spare tail rotor from the hybrid, with the flipped tail motor--the speed rotor made it too fast and too uncontrolable, so I put on the fake one w reversed pitch because it was a little faster than stock and easier than re-flipping the tail)

Freeonthree said:

Did you check the tx batts, under load (tx on) even better. I flew Yellow with the new tx batts, and didn't experience any glitches, so I dunno…  I wish they would put some kind of battery level warning device on these tx's, a meter, led's or something.  Also, im going to buy a set of Duracells, and give those a try, see how thier voltage holds up compared to the cheapies from the Dollar Store.  Hey, I got 5 sets of 12 AA's for 5 bucks !  I couldn't resist

My 107 had just arrived when this problem was going on with the 105, so I used the new TX and batts. Channel changes etc, the 105 still played up. Still suspect hot motor draw..?

My 105G after many flights was doing this. It felt like it was running out of battery early into the flight, than it would come alive again in bursts. I thought the same as you, with M/B or battery being the problem.
 
I found that the rear motor was extremely hot compared to the front. A hot motor draws power and the m/b is confused is my only conclusion at this stage. I'm waiting for a new motor to test out my theory.

In the mean time, take the canopy off your model. Hold the copter and run it for two minutes or so and checkout the motor for any big difference in motor temps. lets us know how that  goes.

Yikes, they were down to 1.25 with the tx on.

I just installed new one's, and now it's over 1.6 under load (tx on).

Time for a test flight  :>)

Basically, when 1.5 volt batts get down to 1.5 Volts, their done for use in anything serious, just like out 6 volt RC packs in the planes and heli's.  When they get down to 6.0, it's recharge time.  I think we may have solved your delema. Im sure crossing my fingers, and my eye's. lol  Put your hand on the speaker, and repeat after me...  I hope thats it, I hope thats it.... 

I don't think it's the motor, since it doesn't seem like it's just one motor getting the burst. I'm going to fly again in a few to double check.

It's not that it's loosing the power as much as it is suddenly regaining that I'm worried about. The burst could kill the engines or the mb, if it isn't the motherboard already.

I need to also make sure it wasn't something from the fact that I was outside or the remote has dead-ish batteries in it.

Either way, I lost a dogbone, and it's getting old and abused. These things aren't meant to last forever without something being replaced.

Now, if only I could convince my dad whenever it does break to let me solder it... but he probably won't let me because "i'll end up some electronics solder stoner junkie kid" or something where I hack everything electronic and really screw up my life or some bull crap.