I'm very new to model helis - and currently trying to set up and trim my
completed collective-pitch model. However, I'm having trouble with the set
up of the rotors.
I have the model strapped down to a black & decker workmate while I setup.
However when fire up the engine (.46H) and spin up the rotors, I notice the
rotors form TWO discs rather than one. I marked on of the blades with some
red tape so I could identify which blade was tracking higher. I then
adjusted the push rod from the swashplate to the bell/hiller mixer to
increase the pitch of the blade that was tracking down, and decrease the
pitch of the blade tracking up.
Unfortunately, even after several attempts at this, there's very little
difference, except for the following. Initially, the gap between the rotor
discs was about 4cm, through the entire range of throttle/collective. Now I
have adjusted the length of the rods, I notice that the gap is about 3.5cm,
but reduces down to approx. 1cm at high throttle/collective.
Note that the situation is totally unaffected by the cyclic control. The
cyclic works brilliantly, adjusting the plane of the rotors, but still two
discs are clearly visible rather than one.
I also tried adding a slight pitch to the flybar paddles in an effort to add
a little more correction, but this caused the two discs to blur towards the
front of the model (i.e. they were flapping).
I'm at a loss! What do I adjust to make the rotors form one disc?
Many thanks in anticipation for your time and help,