What is the advantage of the conventional tail on an aircraft over the T-tail? Urgent Answers needed!!!!!!!!!!

Question

What is the advantage of the conventional tail on an aircraft over the T-tail? Urgent Answers needed!!!!!!!!!!

Answer 1

well theres is only one advantage if its a propeller driven single engine aircraft, otherwise theres no adavantage...  the advatage is that in case you have to go around,, i mean overshoot your landing suddenly the increase in backwash due to sudden increase in power will push the elevator downwards giving an upwards attitude to the nose of the aircraft, thus faster gain in altitude,,,,    hope i helped you

Answer 2

The main reason for the introduction of the T tail was to move away from the engine exhaust when rear mounted engines began to be designed. Another advantage The tailplane surfaces are kept well out of the airflow behind the wing, giving smoother flow, more predictable design characteristics, and better pitch control. This is especially important for planes operating at low speed, where clean airflow is required for control. deHavilland Canada's line of larger STOL aircraft all use this arrangement for this reason.

Some of the disadvantages are, the aircraft will tend to be much more prone to a dangerous deep stall condition,  T-tailed aircraft can be much more difficult to recover from a fully-developed spin.

The fin must be made considerably stronger and stiffer to support the forces generated by the tailplane. Unless expensive composite materials are used, this inevitably makes it heavier as well.

The control runs to the elevators are more complex.

The elevator surfaces are much more difficult to casually inspect from the ground

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Answer 3

They Both have good tail.

Answer 4

The only real purpose of the T-tail is to move the elevator out of the accelerated slipstream coming from the engine.  As you can imagine, dramatic changes in power setting can cause changes in airflow over the elevator, resulting in wild pitch oscillations (unless the pilot or auto-trim system corrects for it).

T-Tails are not moved high enough to be out of the disturbed airflow coming over the wings.  Most pilots realize that the distance one would have to travel to acheive that is about 1 wingspan.

Some aircraft (like the Piper Tomahawk) have it placed up above to keep is farther away from prop wash.  Some (CRJ) have them placed above to both get it out from the jet blast coming from the engines and to move it simply because that is where the engines are placed.

Some (like the 737) are engineered to work just fine in the conventional placement.

I guess the real answer is that there is no real advantage of one versus the other.  If there was, all aircraft would be built like that.  Some are conventional and some are T-Tail and it is simply a design preference that determines where each is placed.

Answer 5

It doesn't stress the vertical tail as much.

Answer 6

Mark has it right.  The conventional (lower) location for the horizontal stabilizer puts less stress on the vertical stabilizer.  Therefore the vertical stabilizer can be lighter.

Moving the horizontal stabilizer up gets it out of the disturbed flow behind the aircraft and that location can smooth out the flight of the aircraft since the disturbed flow is no longer making continuous changes in the stabilizer loads (resulting in continuous changes in the aircraft angle of attack, resulting in a bumpy ride).

However, moving the stabilizer up can also result in the "deep-stall" phenomenon in which the stabilizer ends up in the region of turbulent air behind a fully stalled wing.  If the turbulent air does not smooth out and attach itself to the stabilizer during a stall the pitch control is entirely ineffective and recovery from the stall becomes more difficult.

Additional considerations are that the lower stabilizer location results in easier access for inspections and maintenance.

Answer 7

T-Tails are designed to be above the most unstable air surrounding an aircraft. They will provided sustained control in certain emergency situations where conventional tails would already be useless.

The weakness is that most T-Tails can be crippled by a single blow to the rudder. In one well-known case, such damage caused an aircraft's ENTIRE hydraulic system to fail mid-flight, making the airliner totally uncontrollable.

Conventional tails have the advantage in terms of SYSTEM REDUNDANCY. Conventional tails can more easily equipped with hydraulic, wire, or mechanical systems that have no single point of failure.

Answer 8

Of course it depends on where the most air flow is. T tails get the elevator up into the air flow on rear engined comercial jets. And there is really no advandage in conventional configuration, elevator at the base of the rudder, unless the plane has propellers. It is all about where the best air flow.

Answer 9

added to the thing people are saying about the drag

almost all rear mounted aircraft engines that are on teh fuselage, no on the wing, have a T-tail

Answer 10

The T-tail is a little further away from the drag from the wings.  Any surface going through the wind causes eddys and this can cause trouble back of that point.  The conventional tail has the "elevators" directly behind the wing so it experiences air disturbance from the wings.  Placing the "elevators" above the tail "T-tail" reduces this disturbance from the wings and makes it more effective for flight.