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500 Class Electric Helicopters 500 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 05-21-2018, 01:36 AM   #1 (permalink)
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Default Sudden blade tracking changes

One of my 500's is suffering sudden blade tracking changes as the load comes on at lift off power/revs.


500, Flybar, one of three. All figures and set up compare to two that are flying well. Futaba FASST. Control movements and throws are checked same as flying examples.



Blades track near perfect right up to the point where they are asked to carry the weight, then they either suddenly with a violent noise change to roughness throw pitch differences or if you really try to reach take off move to 2" plus track differences.



Not bent feathering shaft. Dampers feel OK.

No slop or undue play anywhere I can find.
Have swapped blades, known good, no effect.
Servos operate smoothly, If their action is resisted they pull well and evenly.


I have yanked everything around and found no undue movement anywhere!



Struggling now!!
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Old 05-21-2018, 01:48 AM   #2 (permalink)
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We've had it happen with "cheap" blades. One flight they'd track perfectly, the next they'd be badly out. If you don't have another set, do you have a flying mate who can lend you a set for one flight to check?
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Old 05-21-2018, 01:23 PM   #3 (permalink)
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Yup.been there as above "Have swapped blades, known good, no effect."


Blades that work perfectly on another 500, not on this!
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Old 05-21-2018, 03:32 PM   #4 (permalink)
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When I had a sudden tracking change on my 500 flybarred it turned out to be the SF mixing arm bolts coming loose. They're hidden behind the framework of the flybar assembly, so are difficult to check.
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Old 06-10-2018, 05:38 PM   #5 (permalink)
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Worn dampers?
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