10 for the DF#4 also, to prolong motor life.
Conclusions
Overall, I found this machine much easier to setup than any Walkera and a
dream to hover! Once the tail is adjusted right, it is rock stable and has a sweet sound
to it! The main drive gear gets chewed up easily, so make sure you have plenty of
backlash there as the owner of this machine did not adjust it and I am missing some
gear teeth. It's not effecting flight so far. One drawback though is there is no
autorotation clutch, so Walkera has 2 points on that feature!
The 4-in-1 is factory adjusted to give you +10° and -10° when in “idle up”
aerobatic mode. In regular mode, the blades are always in positive pitch and never go
negative. Since the pitch is factory set within the radio gear, everything else you can
adjust is simplified due to this. Also, I have found the blade pitch links [006/007] to be
very loose and easy to turn. Turn the links all the way in until the plastic pieces [006]
bottom out against each other. Now hold one rod stationary, and turn out a link 5
half-turns. Hold the rod [007] and turn the other plastic ball link out 5 half-turns. This
seems to be a good starting point. This also insures you have equal “meat” threaded
inside both plastic ball links!
Do not rely on the velcro holding the battery to the bottom of the machine in
flight, add some heavy rubber bands around the Battery Support Rods [052]. The main
shaft [050] bends easily, so check this after a crash by powering up the machine with
the head removed and watch the top tip of the shaft while it spins at below half throttle.
Is it wobbling? Either replace or try straightening by bending and rolling on a pane of
window glass. A straight shaft should not wobble when you try rolling it on an inclined
piece of glass.
As with Walkera, I fly this with the canopy removed.
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