What part makes a helicopter reverse and picture of it?

Answer 1

There are two controls on a helicopter that adjust the rotor blades: the cyclic and the collective.

• The cyclic control tilts the rotor blades cyclically so that those on one side of the rotor tilt more while those on the other side tilt less, the result is to tilt the entire rotor disk in a particular direction, resulting in the helicopter moving in that direction. If the pilot pushes the cyclic control in a given direction, the rotor disk tilts in that direction, and produces a thrust vector in that direction, resulting in movement in that direction.
• The collective control tilts all the rotor blades collectively (i.e. all at the same time) and by the same amount, the result is the helicopter increases or decreases its total lift derived from the rotor. In level flight this would cause a climb or descent, while with the helicopter pitched in a given direction an increase in total lift would produce an acceleration together with a given amount of ascent.

So reversing the position of the cyclic control will reverse the direction of horizontal motion (i.e. forward <--> reverse, left <--> right) and moving the collective control can reverse the direction of vertical motion (i.e. up <--> down). The picture shows the linkages for these controls to the rotor blades of a two blade rotor on a light helicopter.