HELI-90/120/140 refers to a helicopter, with the servos orientated at 90 degrees (2 servos, generally beginner helicopters with forward, back, right, and left movement on the cyclic stick), 120 degrees (3 servos- generally for more advanced helicopters that have collective pitch controls on the rotor blades (yes, this means inverted flight too)), ...
canyon. n. 1. (Physical Geography) a gorge or ravine, esp in North America, usually formed by the down-cutting of a river in a dry area where there is insufficient rainfall to erode the sides of the valley.
Summary: 1.The word âcanyonâ is widely used in the United States, and the term âgorgeâ is widely used in Europe. 2.A canyon is a deep valley having steep sides, and a gorge is a deep ravine with a river flowing through it or a ravine without the river. 3.Canyons have been formed through long periods of time and frequent erosion from a plateau level.