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.
The Grand Canyon is one of the largest gorges in the world, carved over billions of years by the Colorado River in a picturesque part of Arizona. At 277 miles (466 km) long, and as much as 18 miles (29 km) wide, the Grand Canyon is one of the most impressive landforms found anywhere.he Grand Canyon is a short drive from Las Vegas. Cougars roam the Grand Canyon. It took billions of years for the Colorado River to carve out the Grand Canyon. The Grand Canyon is in Arizona, which is located in the American West. Whitewater rafting is available at the Grand Canyon.