Home > All About Helicopters > Problems with too much heli vibrations?

Problems with too much heli vibrations?

Ever faces your heli with too much vibrations, despite flying reasonably well? If your answer is yes, then join the club! This is very common and sometimes the cause of it is not that easy to find. Here are some hints to help you on this quest…

1 – Replace all blades with new, balanced ones;
2 – tight the main blades tighter than usual to prevent vibrations supposedly caused by the lead/lag of blades – As far as the blade tightness, spool up to just below hover speed and let the blades find their “straight”… then let the head stop by itself… then tighten the blades… just for testing, so that they do not swing… then spool up and see if the shake shows up…if not, then loosen them a little at a time and continue to try it…usually just a “snug” (they will not free fall if heli is on its side), fit will be fine and not cause a lead lag problem…
3 – The blades are very important, and you might just find that you like the woodies over the cf’s, and semi-symetrical are even better… but you will want to stay in that 1750 + range, maybe even 1850… low head speed and too much pitch can/will cause your vibration, and you will loose your tail authority… take note if there is a specific spot that you see the vibration start(left stick position) and if there is, go to your pitch curve and reduce the pitch at that point, or both sides of that point by about 2 points and then check again.. if the vibe is less then take a little more out..you are “timing” the pitch to the power…

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