answersLogoWhite

0

when the main blade rotates it creates torque and if that torque is not countered by the rear rotor the helicopter will spin out and crash. the helicopters that do not have a rear rotor have another rotor that is the same size moving in the opposite direction

User Avatar

Wiki User

10y ago

What else can I help you with?

Related Questions

Why don't helicopters spin around in the air?

Some helicopters feature a second rotor underneath the first rotor that counters the force applied to the body of the helicopter by applying thrust in the opposite direction of the main rotor. This stops the helicopter from spinning around. Others, instead of a second rotor underneath the first rotor have a back rotor that essentially does the same thing, which is provide a equal force to the first rotor preventing the helicopter from spinning =0


What is a back rotor of a helicopter used for?

it depends. sometimes they make the helicopter turn. On models when they are facing up like the main rotor, they propell it forward so the gyro can fall to one side and lean the chopper forward. The major purpose of the back rotor is to counteract the torque of the main rotor. On helicopters with a single top rotor, if there were no back rotor, the torque would cause the helicopter to spin around as soon as it lifted off the ground.


Why don't helicopters spin in circles?

The back rotor of the helicopter counters the force applied to the body of the helicopter by the main rotor by applying thrust in the same direction as the main rotor. The force from the main rotor is applied in the opposite direction the main rotor is spinning. So say the force the main rotor was exerting on the body of the helicopter was causing the tail to move left then the back rotor would be designed to apply an equal force pushing the tail right to keep it from spinning. If the back rotor of a helicopter malfunctioned it would begin to spin.


Are there Drum or rotor brakes in rear of 2000 explorer?

disc brakes in front and rear ( rotor ) Also , the rear rotors have a small drum on the back of them for small emergency brake shoes


Do helicopters fly backwards?

Yes they do. By pulling back on the cyclic stick the main rotor swings backwards forcing the helicopters to go backwards. -Credits Lukespill


What are the two small propellers on a helicopter?

Oh, dude, those little spinny things on a helicopter are called the tail rotor and the main rotor. The tail rotor helps the helicopter not spin out of control, and the main rotor is like the big boss that actually lifts the whole thing up. So yeah, those propellers are pretty important for not crashing and stuff.


What helicopters can do a back flip?

mine


What type of parking brake may be found on vehicles with rear disc brakes?

My Explorer uses small parking brake shoes inside the back of the back rotor


How do you remove back rear break rotor on an equinox?

most rotors have a threaded hole so that you can screw in a bolt to back the rotor off of the hub. there may also be a small emergency brake set up inside the inner hub portion of the rotor. if someone has driven with the e-brake on, there may be the same type of lip you would encounter on drum brakes. hope this helps.


What does rear brake rotor mean?

Rear is to the back of the vehicle. Brake rotor is the rotating part of a disc brake.


Another name for helicopter propelers?

Main rotor and tail rotor. The main rotor is on top of the helicopter consisting of two or more blades, and the tail rotor is at the back of the helicopter, which also consists of two or more blades.


Why is a single rotor never used?

It would defy the physics that helicopters already fight to stay airborne. Example. The small weights on the rim of your car. You lose one 10gram weight and you can already feel the difference of the weight on the wheel. Apply it to a helicopter. One blade weighing about 70kg spinning around the central point. however it is possible, igor sikorsky's first heli had only 1 blade... you try to swim with 1 hand possible but unstble The MD 520N helicopter doesn't have a tail rotor. They direct the jet blast from the engine through a vent in the tip of the tailboom. As to the above...the er seems to be confusing "rotor disc" with "rotor blade." Some helicopters CAN fly on one rotor blade. I was at the fire station at Campbell Army Airfield at Ft. Campbell, KY, in 1983 getting some fire extinguishers recharged, when all of a sudden the whole station cleared out to go to an incident. A CH-47C Chinook helicopter had lost two of the three blades on its rear rotor. It landed safely--very tail-low, but safely--but I can only imagine the pilot fought that aircraft the entire way back to the airfield. A Blackhawk, which has one main rotor (Chinooks have two), would have crashed under similar circumstances because he wouldn't have had enough lift to stay in the air.