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As jet fuel can be easier to obtain than avgas in remote areas, turboprop-powered aircraft like the Cessna Caravan and Quest Kodiak are used as bush airplanes. Turboprop engines are generally used on small subsonic aircraft, but the Tupolev Tu-114 can reach 470 kn (870 km/h; 540 mph).
Today's turboprop airliners have better fuel-efficiency than current jet airliners, in part because of their propellers. In 2012, turboprop airliner usage was correlated with US regional carriers' fuel efficiency. [17] The Airbus A220-300 is the most fuel-efficient, compared with the A319neo and Boeing 737 MAX 7 [45]
Turboprops are bizav's overlooked middle child. With fuel prices and regional travel up, some operators view them as a better business jet. ‘Lower Costs, Larger Cabins’: Why Aviation Companies ...
Propeller systems, such as turboprops and propfans are a more fuel efficient technology than jets. But turboprops have an optimum speed below about 450 mph (700 km/h). [ 124 ] This speed is less than used with jets by major airlines today.
A corollary of this is that, particularly in air breathing engines, it is more energy efficient to accelerate a large amount of air by a small amount, than it is to accelerate a small amount of air by a large amount, even though the thrust is the same. This is why turbofan engines are more efficient than simple jet engines at subsonic speeds.
For instance, in aircraft, turbine (jet and turboprop) engines are typically much smaller and lighter than equivalently powerful piston engine designs, both properties reducing the levels of drag on the plane and reducing the amount of power needed to move the aircraft. Therefore, turbines are more efficient for aircraft propulsion than might ...
specific air range at high altitude is 3.4 km/kg (0.83 nmi/lb) compared with around 2 km/kg (0.49 nmi/lb) for current jets or 2.7 km/kg (0.66 nmi/lb) for other turboprops." [ 42 ] By this estimate, fuel efficiency is 70% better than comparable jet aircraft, although this greater efficiency is achieved only at a relatively slow 315 KTAS and ...
The hot-jet exhaust is an important minority of thrust, and maximum thrust is obtained by matching the two thrust contributions. [8] Turboprops generally have better performance than turbojets or turbofans at low speeds where propeller efficiency is high, but become increasingly noisy and inefficient at high speeds. [9]
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