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If the engine is placed above the body of the plane, the body acts as a shield that reflects or absorbs the noise going towards ground level, much the same way that a wall will muffle sound from an adjoining room

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Q: Why does an aircraft which has its engines above the fuselage produce less noise than one which has the engines below its body?
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The rotor blade on the side of the helicopter that moving in the opposite direction?

The tail rotor is moving "perpendicular" to the main rotor, not "opposite". The tail rotor creates thrust opposite to the thrust of the main rotor, to keep the fuselage from spinning. Most helicopters spin the main rotor counter-clockwise looking from above, which puts a clockwise rotation on the fuselage. You need a tail rotor pushing the tail counter-clockwise to keep the fuselage pointed in the direction the pilot chooses.

How do airplanes lift off from the ground?

Aircraft wings produce lift by a principle discovered by Bernoulli. The air above the wing is at a lower pressure that the air below essentially socking it up. But is also true that the air beneath the wing strikes it providing a action reaction.

Define sonic boom?

An explosive sound caused by the shock wave preceding an aircraft traveling at or above the speed of sound.

Do planes have gravity when in the air?

Yes, gravity affects everything that has mass, everywhere, all the time. In the case of an airplane, gravity is pulling the airplane down. The engines move the airplane forward, and the speed of the air over the wings causes lift, which pulls the aircraft UP. The friction or "drag" of the aircraft moving through the air causes the plane to slow down. It's a delicate balance; the thrust of the engines, and the drag of the airflow, and the airflow causing lift which counteracts gravity. But you can do one simple experiment which proves that gravity affects the plane and everything in it. When you are in an airplane in flight, take your inflight magazine and hold it about 10 inches above your lap; then let go. Gravity affects the magazine and pulls it down.

How long does it take an airplane to get off the ground?

Depends on the aircraft, and the velocity of the air over the wings that produces enough lift to get the aircraft into the air. For aircraft that are STOL capable (Short Take Off and Landing) this time will be short, but ultimately it depends on the wind conditions, and the thrust of the aircraft. VTOL (Vertical Take Off and Landing) aircraft can take off instantaneously. There are too many variables to give a short answer, as stated above, but as an example, a fully loaded modern day commercial airliner like the Boeing 767-400 might have a take-off run of 9000' to 9500' before the main landing gear actually lifted off the ground.

Related questions

Why don't modern commercial aircraft have viewing decks for passengers either above or below the aircraft's fuselage?

Some Luftusana do have them on their planes. I was on one last summer that had a bank of restrooms below the fuselage. It was a really cool plane.

Do jet engines airplanes have a critical engine?

With the above mentioned answer, it is pretty much correct except for the twin engine aircraft. For the twin engine aircraft, the critical engine is the one that produces a thrust line closest to the fuselage. Example: if the twin engine aircraft is equipped with 2X engines which have the propeller rotating in a clockwise direction, then the left engine will be the critical engine. This is because the down going blade on the left engine will produce a line of thrust closest to the fuselage compared to the right engine's propeller. So it is safe to say that if the left engine fails, the aircraft will be harder to control because the thrust line produced by the live engine on the right side has a longer arm from the fuselage causing a higher moment wanting to yaw and roll the aircraft to the left which is harder to control compared to if the right engine fails, such as the Piper Twin Comanche aircraft. However, if the twin engine aircraft is equipped with counter rotating propellers, meaning, the left engine prop rotating clockwise and the right engine propeller rotating counter clockwise, then there is no critical engine, because both down going blades of the propeller produces a thrust line both equal in distance from the center of the fuselage.

Is waist a noun?

Yes, it is a noun. It is the anatomical area at the lower end of the abdomen, above the point where the legs join the pelvis. The term is also applied to the central portion of an aircraft fuselage.

What is a biplane?

A plane with two wings on each side of the fuselage

How many engines does a jet plane have?

Depending on the size of the jet, the amount of engines may vary between 2 and 4 (on most commercial aircraft) The engines can be fixed to the wings, integrated in the tail, or above the stabilizers in the rear of the plane.

Where is the engine located on a single engine plane?

Most commonly on the front attached to the fuselage. However, there are many variations. On a "pusher" the engine is at the back of the fuselage. The engine can be mounted above the wing and fuselage on some seaplanes.

What a different aircraft pump feed with aircraft gravity feed?

If this question relates to the fuel system , A gravity feed system would need to have the fuel tanks in the wings that would need to be above the level of the engines, IE: in a high wing aircraft. A pumped system would be used in a low wing aircraft or in a engine that required a constant fast fuel flow.

How fast can a jet aircraft go?

conventional jet engines (using a compressor) will operate at speeds up to slightly less than Mach 1using an afterburner a conventional jet engine can operate at speeds slightly above Mach 3ramjet engines will operate at speeds up to about Mach 5scramjet engines can operate at speeds well above Mach 6However the maximum speed of of an actual airplane is usually less than the capability of the engines it uses.

How high would a plane be flying to NOT create a sonic boom?

The aircraft would need to be above the atmosphere. Unfortunately there would be no air for the engines or for the wings to generate lift, so the flight would end abruptly.

What altitude do single engine planes fly?

Generally, about 10,000 feet is the service ceiling for most single engine aircraft. Above 10,000 feet, most carburated engines lean out too much to run well and most humans have trouble breathing above that altitude.

What does rotor mean?

Rotor blades are on helicopters. They are the long narrow parts above the fuselage (cabin) .When these rotate they impart 'lift' to the helicopter.

When departing behind a heavy aircraft the pilot should avoid wake turbulence by maneuvering the aircraft?

above and upwind from the heavy aircraft.