Specifications

So, the transmitter sends separate signals for fore/aft cyclic, left/right cyclic, and blade pitch.
The servos for these functions plug directly into the receiver channels. The control horns for
the servos are connected to the mechanical mixer which mixes the movement of the individual
servos into the lower swashplate movement.
The fore/aft servo output goes to the mechanical mixer, and its motion is converted into the
fore/aft tilt of the swashplate.
The left/right servo output goes to the mechanical mixer, and its motion is converted into the
left/right tilt of the swashplate.
The pitch servo output goes through the mechanical mixer, and its motion is converted into the
swashplate height.
The most common type of mechanical mixer is the type used on the Raptor and T-rex heli-
copters. This consists of a "rocker arm" of which one side is connected to the swashplate. The
left/right servo is mounted inside the other side of the swashplate, and the fore/aft and pitch
servos are mounted under the rocker arm.
The ECO 8 when configured for a mechanical mixer uses a "sliding platform" type of mixer.
This mixer performs all the functions of a rocker arm mechanical mixer and also performs revo
mixing as well, so there are four servos connected to this type of mechanical mixer.
30.1.3.2. Electronic mixing (eCCPM)
For electronic mixing, there are three or four servos which are directly connected to the lower
swashplate which control the height and tilt of the swashplate.
There are usually three servos which are connected to the lower swashplate at 90 or 120 de-
grees apart, although there are variations which use four servos or have the servos placed 140
degrees apart.
So, the transmitter reads the stick positions and performs calculations internally to determine
the positions of the servos to create the correct swashplate height and tilt.
These servo positions are transmitted to the receiver which sends the information to the ser-
vos.
The movement of the swashplate is the same as with mechanical mixing. The fore/aft cyclic
controls the fore/aft tilt of the swashplate, the left/right cylic controls the left/right tilt of the
swashplate, and the pitch controls the height of the swashplate.
The Logo 10, ECO 8 configured for electronic mixing, Hummingbird Elite CP, Hornet CP, and
other helicopters use this system.
30.1.3.3. non-CCPM
For a non-CCPM control system, there are two servos which are directly connected to the
lower swashplate, and a third servo which directly controls the main blade pitch.
So, the transmitter sends separate signals for fore/aft cyclic, left/right cyclic, and blade pitch.
The servos for these functions plug directly into the receiver.
The fore/aft servo is directly connected to the lower swashplate and controls the fore/aft tilt of
the swashplate.
Technical Appendix
168