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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 07-15-2021, 10:56 AM   #1 (permalink)
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Default 600N DFC servo power

Hi all, some advice please, I have savox 1258 cyclic servos and had a crash due to the A arm plastic link on the swash and one of the elevator push pull link broke, it might be due to the crash, I flew a loop and whet it came out of the loop it did not respond to positive pitch, it went straight down tail first no spin, anyhow, on the rebuild, i test the swash push force and was able to easilly hold the swash down with my fingers, i have external bec 6v, is so little pushdown force normal? Thanks all
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Old 07-15-2021, 11:15 AM   #2 (permalink)
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Did you check the BEC's output voltage with a meter?
Check the voltage while you are moving the cyclic and collective stick from lock-to-lock and see if the meter's reading visibly jumps way off the 6v setting.
If it does, the BEC may have gone bad.

The Savox 1258 is rated at 166.65 oz-in (12.00 kg-cm) at 6v.
If you applied 166oz force at the end of the hypothetical 1" servo arm the servo would stall and not move.
If you applied more than 166oz, it would move backwards.

If you can easily hold the swash down against all 3 swash servos, I'd vote for a bad BEC. But you need to test it first.

I'm assuming you don't have a modern flight controller on the heli that records voltages and such and support telemetry. Maybe it's time to think about getting one of those too.
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Old 07-15-2021, 11:27 AM   #3 (permalink)
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Thank you, but thats the weird thing, i installed the 6v hobbywing bec after the rebuilt, had only the 2 in 1 align before, I fly MSH Brain 1, with the 2 in 1 it did the same, o have never pushed down on a servo therefore i have no idea if its normal, on the previous flight it did it too but not that aggressive, and i recovered i will measure under load like you suggested.
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Old 07-16-2021, 03:20 AM   #4 (permalink)
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Hi, I have tested voltage under load(finger pressure on swash, and on the multi meter the voltage drop to 3,5v from 6 and when released pressure back to 6v again, I used the throttle servo port on receiver for measurement, very confused, bec too low amp spec or bad or could a servo pull too much power and be faulty, Thanks, advice please
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Old 07-16-2021, 07:26 PM   #5 (permalink)
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I would plug each servo in one at a time and test under load to rule out bad servos, if it happens on each you know you need a new bec.
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Old 07-17-2021, 05:54 PM   #6 (permalink)
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Quote:
I have tested voltage under load(finger pressure on swash, and on the multi meter the voltage drop to 3,5v from 6 and when released pressure back to 6v again
Well, if all three swash servos are stalled at the same time (like pressing down equally on the swash), then all of them will be drawing their maximum current at the same time.
And that might just crush the HW BEC's normal capacity.
You can also press down on one servo's arm at a time to see if the voltage drops off. If only one of the 3 swash servos is stalled and the voltage drops to 3.5, then the BEC is bad or underrated.

It is possible that one of the 3 swash servos is going bad and drawing more current that it should.
You could see this on the voltmeter when you exercise the cyclic and collective sticks in ever direction at the same time or one of the servos might feel excessively hot to the touch.
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