Thread: Discussion Walkera 4F200 3 blade head
View Single Post
Old Aug 31, 2012, 01:47 AM
razorblade is offline
Find More Posts by razorblade
Registered User
razorblade's Avatar
United States, MN, Coon Rapids
Joined Feb 2012
310 Posts
AR7200BX Cyclic Oscillation

I am currently dealing with some AR7200BX cyclic oscillation issues.

The problem is three fold:
  1. The 4F200 is a small 200 size heli
  2. The AR7200BX is sensitive to input voltage and needs a BEC voltage of 5.0 volts when fitted into a small 200 size heli.
  3. The HobbyWing FunFly 40A BEC is measuring at 5.3 volts (+/- 1 volt).
In my latest flight video I am flying with a different ESC, the HobbyWing FunFly 40A ESC with built-in switched BEC rated (on the label) at 3 amps and 5.0 volts. But I measured the actual running voltage to be 5.3 volts.

On the AR7200BX there is a trim pot #1 used to trim cyclic gain. I have it turned all the way down. I can't go any lower. And cyclic oscillation still appears.

So I am considering getting the Castle Creations BEC. Its $24 dollars from my LHS. The output voltage is programmable from 4.8V to 9 volts in tenths of a volt increments. From what I have read and heard is the output voltage is very accurate. Sounds like this will be "a" solution to my problems.
razorblade is offline Find More Posts by razorblade
Last edited by razorblade; Aug 31, 2012 at 01:57 AM. Reason: punctuation
Reply With Quote