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Flybarless Twinn Rexx

Posted 08-01-2012 at 07:00 AM by jolyboy

I'm now in the process of upgrading my twinn rexx to flybarless . Reasons for doing so are:
  1. Simplified set-up
  2. Mechanically better (less "slop")
  3. Lighter
  4. Better for use with autopilots in the future
  5. More crash resistent
  6. Ability to run an ultra-low headpeed for FPV flying (no flybar requiring inertia to operate)

I'll be running 2 x Tarot 450DFC heads, with one Tarot ZYX-S flybarless unit fed into a TH-2 tandem mixer. The tandem mixer settings will be the same as when I was running an FB system.

So far, I only have the heads and the electronics installed, but still need to perform the rest of the set-up process. The process will be as follows:
  1. Set servo arms at 90 degrees to shafts @ midstick
  2. Level both swashplates
  3. Set blade pitch to zero degrees @ midstick
  4. Perform initial Tarot ZYX-S setup process
  5. Reduce gain on elvator axis, then adjust static rotor pitch for balance between rotor's thrusts (no up/down pitch in hover)
  6. Complete final ZYX-S setup

Among the FBL upgrades, I'm also upgrading the M2 x 20 bolts going through the miter gears, as they have all turned into "S" shapes. Turns out they are under rated for my application. I'll be trying out some M2.5 x 20 bolts with shoulders (ie. not threaded the whole way along).

Another upgrade I'll be doing is the addition of 600 size landing gear. I currently use "doubled up" (two zip-tied together) 450 skids, which are too low to the ground. The new ones are much wider and higher and will allow for harder landings without damage to the battery.
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