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Are turboprops more efficient than jets?
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.
Why do turbojets Ramjets and pulse jets have very little to no use in modern aircraft?
Turbojets, ramjets, and pulse jets have very little to no use in modern aircraft due to noise and fuel consumption. Small general aviation aircraft use mostly horizontally opposed reciprocating piston engines. Many aircraft use a form of the gas turbine engine to produce power for thrust.
How long does it take a jet engine to spool up?
Jet engines require time to accelerate, so the increase in thrust (known as spooling up) improves the ability to go around should it be necessary. Jet engines (U.S. certified) can require up to eight seconds to accelerate from idle to maximum thrust.
Why do jet engines take so long to start?
Jet engines take much longer to spool up (i.e. increase RPM) than piston engines, especially at low RPM because of the pressure ratio/increased airflow necessary to keep the compressor from stalling/surging/blowing up every time when changing power settings.
Why does a jet engine take longer to spool up?
Jet engines take much longer to spool up (i.e. increase RPM) than piston engines, especially at low RPM because of the pressure ratio/increased airflow necessary to keep the compressor from stalling/surging/blowing up every time when changing power settings.
What kind of plane is a turboprop engine?
Despite the name, a turboprop is not a piston-driven aircraft. It has a jet engine, or engines, turning a propeller as opposed to a fan. Sure, it’s a “prop” plane colloquially; this is a source of confusion for many passengers. And sometimes that confusion leads to reticence on the part of passengers to fly them.
Can a jet plane start up with a prop?
If you gave jet planes a really powerful battery, the work done would be huge, and a lot of force would be applied in very little time (high wattage), so that it would start up in the same time as a prop.
How many passengers can a turboprop plane hold?
Their products—the Q400 and the ATR72—go head to head in the turboprop market. The Q400 seats up to 90 passengers, and it also comes in a smaller version with 50 seats known as Q300. The ATR72 welcomes 72 passengers, with a smaller model, the ATR42, seating 42.