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fly_slowly
rrNovice Terrebonne, Quebec - Canada |
Sudden Pitch Changes -> hit the wall Something strange happened after I installed my new Futaba GY520 gyro on my Blade 450 3D. On the first flight, with some wind, the helicopter occasionally jumped up and down by a foot or two. I was able to land it safely, took it into my workshop, removed the blades and tried to reproduce the problem on my workbench. Everything was normal. First I deduced it cannot be a servo because all three move together for a pitch change. Cannot be the gyro as the tail was acting normally.Checked the transmitter for bad internal connection. Nope. Ruled out the throttle potentiometer because a) the monitor on the transmitter showed nothing abnormal b) can't reproduce it on my workbench without blades.So I am left with : receiver. Switched receivers (from Hitec Optima 6 with SPC to Hitec Minima) and went outside with blades. Still strange behavior, now even before takeoff : no liftoff at usual position of throttle stick but uncontrolled left cyclic. Now, maybe it's the cold (-14 deg Celsius) ? Wasn't a problem before I switched gyros.Anyway. I take it inside on the floor of our bedroom and spool up (have done short hovers for testing purposes in there before; not recommended, I know :-P). So I spool up and slowly increase the pitch. No takeoff yet at the usual point. But then, all of a sudden, the Blade jumps off the ground banking left and crashes into the wall a fraction of a second later. No one hurt and no serious damage (blades, one blade grip, two servo gears).I am out of ideas here. Before I changed to the GY520, I used a RadioLink GY100 which wasn't too bad but had a tendency to short random tail moves. Also switched to a JR DS290G tail servo. Except the strange tail behavior due to the gyro I had no problems at all. (Why I used the GY100 and not the stock G210 is another story).My last idea is the possibility that due to the better performance of the GY520 there is so much current draw from the tail servo that I am experiencing brownouts from the stock ESC BEC. Could it be ? How can I check for short current spikes ? I could always go back to the GY100 or the G210 but at this point, I am not sure I want to spool up again before identifying the root cause.Sorry for the long (first) post. I thought context might be important.Any ideas ?Aurel |
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enerko
rrNovice Melbourne, Victoria-Australia |
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JKos
rrProfessor Redondo Beach, CA |
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Zbawer
rrApprentice Singapore |
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fly_slowly
rrNovice Terrebonne, Quebec - Canada |
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AirWolfRC
rrProfessor 42½ N, 83½ W |
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fly_slowly
rrNovice Terrebonne, Quebec - Canada |
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fly_slowly
rrNovice Terrebonne, Quebec - Canada |
Update : Solved The issues have disappeared but it is not entirely clear to me why. This is what I did.1. Installed CC BEC. My worry is the stock ESC BEC might have glitches because some melted snow got into it.2. Made 3" long servo cables from the GY520 three way plug to the receiver (instead of 20mm cables I used before).3.Installed receiver antenna vertically on the tail boom, above the tail servo.4. Noticed that the signal wire connector of the elevator servo plug came out when plugging into the receiver. Damaged connector plug. Made sure all wires are well plugged into the receiver.As I mentioned, not clear which of these four issues caused the problem, but I am glad it's fixed. |
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icanfly
rrElite Veteran ontario |
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