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.. 

Sunday, May 20, 2012

DEADLY ACCIDENT IN NEPAL

DORNIER AIRCRAFT OF AGNI AIR

The aircraft belonging to local carrier Agni Air crashed near Jomsom airport, a gateway to the nearby Annapurna mountain range, shortly after the pilot reported a fault, a rescue official told AFP.

"Fifteen people have been killed. Thirteen of them were Indian tourists and the other two were Nepali pilots,"

The cause of the crash was not immediately clear, but Bimlesh Lal Karna, head of Nepal's national rescue department, said the pilot had reported a warning light flashing in the cockpit as he descended to Jomsom.
The pilot told air traffic control moments before the crash that he was diverting back to Pokhara, said Karna.
"While returning to Pokhara, the aircraft seems to have lost balance," Karna told AFP.
The incident was the second deadly air accident for Agni Air in less than two years.

Saturday, August 6, 2011

Dornier 228-200

Dornier 228-200. click here to know more


The Dornier Do 228 is a twin-engined STOL utility aircraft and regional airliner with a capacitiy of max. 19 passengers produced by the German manufacturer Dornier GmbH, today produced by RUAG Aerospace Services GmbH as the Do 228NG. The Do 228 is also license-built by HAL, Hindustan Aeronautics Limited in India as the HAL Dornier Do-228.
Crew2
Passengers19
Propulsion2 Turboprop Engines
Engine ModelGarrett TPE331-5
Engine Power (each)525 kW704 shp
Speed428 km/h231 kts
  266 mph
Service Ceiling8.534 m28.000 ft
Range600 km324 NM
373 mi.
Empty Weight3.086 kg6.803 lbs
max. Takeoff Weight5.700 kg12.566 lbs
Wing Span16,97 m55,7 ft
Wing Area32,0 m²344 ft²
Length16,56 m54,3 ft
Height4,86 m15,9 ft
First Flight09.05.1981
Production Statusin production
Total Production>500
ICAO CodeD228
FAA TCDSA16EU
Data for (Version)Dornier Do 228-200
VariantsDo 228-101, Do 228-200, Do 228-201, Do 228-202, Do 228-212 (Do 228 NG)


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