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.
Gorge vs Canyon. Gorge and canyon are interchangeable. In some countries, âgorgeâ is used for âcanyonâ and vice versa. The word âcanyonâ is widely used in the United States, and the term âgorgeâ is widely used in Europe. Anyways, the dictionary says that 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.