What is Torque turboprop?

What is Torque turboprop?

Torque is used as the primary power selection indication for turboprop engines. Typically, torque is given in foot-pounds, though some engines do use percent values. Torque selection is analogous to manifold pressure in piston driven aircraft, as it is a measure of the work available to be transferred to the propeller.

How do turboprop planes slow down?

Larger turboprop aircraft have propellers that can be adjusted to produce rearward thrust after touchdown, rapidly slowing the aircraft. Commercial jet transport aircraft come to a halt through a combination of brakes, spoilers to increase wing drag and thrust reversers on the engines.

What is Ng in turboprop?

The N1 is a speed sensor inside the combustion chamber measuring the rotational rate of the turboshaft and not the propeller speed. On some turboprop aircraft it is labeled as a N1 or a Ng (gas generator). The N2 is a speed sensor measuring the rotational rate of the propeller shaft.

Why is there a propeller control for pt6 turboprop planes?

This is due to the fact that the free turbine design of the PT-6 mandates control of the engine and propeller simultaneously. The governor must interface with the propeller, the engine fuel control unit, and the synchronizing system, simultaneously to provide desired outcomes.

Why Are turboprops more efficient at low speeds?

Compared to turbofans, turboprops are most efficient at flight speeds below 725 km/h (450 mph; 390 knots) because the jet velocity of the propeller (and exhaust) is relatively low. Modern turboprop airliners operate at nearly the same speed as small regional jet airliners but burn two-thirds of the fuel per passenger.

Are turboprops Jets?

The main difference between a turboprop and a jet is that a turboprop is a jet engine turning a propeller. Turboprops are a hybrid of jet engines and the more traditional piston engine propeller that you see on smaller, lightweight airplanes. This does not mean turboprops are slow or fly low compared to jets, however.

Why does the A380 only have 2 reversers?

When the A380 was first designed, there was a debate about whether the plane would feature reverse thrust at all. A380s are designed to come to a complete stop using their brakes alone. Ultimately the decision was made to put reverse thrust on two engines to help minimize the risk of aquaplaning.

What is the advantage of a turboprop?

Turboprop engines are lightweight so they can provide a better performance during takeoff while maintaining fuel efficiency. There are fewer moving parts in a turboprop engine compared to other engines, making it more reliable in terms of mechanical aspects.

What is Pyair?

Px and Py are modified air pressure bleeding from axial compressor. Py is connected to Ng speed governor in FCU through an external pressure air pipeline. Propeller speed governor. The propeller speed governor consists of three parts: constant speed unit, beta valve and Nf speed governor.

What is ITT in a turbine engine?

Interstage Turbine Temperature (ITT) is the temperature of the exhaust gases between the high pressure and the low pressure turbines. The gas temperature is measured by a number of thermocouples mounted in the exhaust stream and is presented on a flight deck gauge in either degrees Fahrenheit or degrees Celcius.

Do jet engines produce torque?

This neutralizes the torque from the rotating blades. However, although jet engines are almost torqueless, the inertia of the rotating parts is quite significant and can produce “interesting” gyroscopic effects.

How high can a turboprop plane fly?

Most civilian turboprops cruise anywhere from 8,000 feet through 18,000 feet. The oxygen requirements are often more restrictive than the aircraft performance. Turboprops have a large latitude in choosing how high they want to go. Terrain and weather will often dictate which altitude(s) are chosen.

How is the power output of a turboprop limited?

The power output of a turbine engine, jet or turboprop is limited by internal temperature, pressure and the rpm of its rotating components. If the temperature is too hot the crucial engine parts will break, or melt.

How is the torque measured on a turboprop?

There is another turboprop value — torque — that is also measured and reported to the pilot, and that is really just another way of measuring shp. The engine actually twists against the resistance of the propeller and the twisting force is measured and shown as a torque value.

Where is the condition lever on a turboprop engine?

The propeller rpm range is normally from 1,500 to 1,900. The condition lever controls the flow of fuel to the engine. Like the mixture lever in a piston-powered airplane, the condition lever is located at the far right of the power quadrant. But the condition lever on a turboprop engine is really just an on/off valve for delivering fuel.

Which is better a turboprop or a reciprocating engine?

Turboprop Engines The turbojet engine excels the reciprocating engine in top speed and altitude performance. On the other hand, the turbojet engine has limited takeoff and initial climb performance as compared to that of a reciprocating engine.