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.
Basin vs Valley. A basin is a depression or hollow on the earthâs surface, which is surrounded by higher land. A valley is also a depression or hollow between hills, mountains and uplands. A basin, which is also called a watershed, is the part of land that is drained by a river and its various tributaries.Creeks and streams are the characteristics of a basin, which helps in the draining of the water that falls on the surface into a river, which is then carried into the ocean.asin vs Valley. A basin is a depression or hollow on the earthâs surface, which is surrounded by higher land. A valley is also a depression or hollow between hills, mountains and uplands. A basin, which is also called a watershed, is the part of land that is drained by a river and its various tributaries.