Wednesday, July 1, 2020

Turboprop Engines

Turbo Propeller Engines are one of the widely used Jet Engines for short haul flights.

What is TurboProp Engines and how do they work:

A turboprop Engine is a jet engine attached to a propeller.

The turbine at the back is turned by the hot gases, and this turns a shaft that drives the propeller.

Some small airliners and transport aircraft are powered by turboprops.


Like the turbojet, the turboprop engine consists of a compressor, combustion chamber, and turbine, the air and gas pressure is used to run the turbine, which then creates power to drive the compressor.

Compared with a turbojet engine, the turboprop has better propulsion efficiency at flight speeds below about 500 miles per hour.

Modern turboprop engines are equipped with propellers that have a smaller diameter but a larger number of blades for efficient operation at much higher flight speeds.

To accommodate the higher flight speeds, the blades are scimitar-shaped with swept-back leading edges at the blade tips.


Engines featuring such propellers are called PropFans.



Tuesday, June 30, 2020

Turboprop Advantages and Disadvantages

Turboprop Advantages


1. Efficient & cost-effective for short distances:

A turboprop engine is more lightweight than a jet, giving it better performance during takeoff. This type of engines are fuel efficient when flying at lower altitudes (below 20000 ft).

2. Shorter Runways are enough for Take-off and landing:

Turboprop can land in shorter, less highly improved runways. Turboprops can also handle the grass airfields that jets must avoid. 

3.      Lower maintenance and operation costs:

The overall cost of a turboprop is lower than a jet both for chartering and for owning. Fewer moving parts in a turboprop engine make it more reliable and less likely to require extensive maintenance. Since turboprops burn less fuel per hour than jets, their hourly operation cost is lower.

Turboprop Disadvantages

1.      Slower cruising speed

Since turboprops have a slower maximum efficient cruising speed – up to an average of 300 knots indicated airspeed (KIAS) depending on the aircraft – expect your overall flight time to be longer than it would be with a jet. Although the hourly cost of a turboprop is lower, since the slower speed makes the flight time longer, at some point with a longer distance flight, the cost savings will be offset.

2.      Lower cruising altitude

Turboprops typically have an altitude ceiling of 25,000-30,000 feet. If you run into turbulence or inclement weather conditions at this altitude, a turboprop won’t be able to avoid them by climbing to a higher altitude like a jet can. This may make for a bumpy and uncomfortable ride.

3.      Shorter range

Turboprops’ slower cruising speed and lower cruising altitude equates to shorter range even factoring in improved efficiency. This means that while turboprops are great for short and mid-range flights, they are not designed for long-distance travel. Expect an average range of around 1,000-1,300 miles

Thanks..