An engine has gross thrust of 150KN. If mentioned designed condition needs to be met is that the ram drag should not exceed more than 18KN then, find the net thrust by engine.

Propulsion topics include: Jet-engine thrust considerations, turbojet installed thrust, installed-thrust methodology, piston-engine and turboprop performance. Aircraft propulsion systems generally consist of an engine and a means to generate thrust, such as a propeller or nozzle. The propulsion system's thrust must balance the airplane's drag when cruising.  Here are some types of aircraft engines: Turbojet: A jet engine that uses a turbine-driven compressor to compress air for fuel combustion. The engine produces thrust by spraying a high-energy gas stream from the exhaust... Show more

Propulsion topics include: Jet-engine thrust considerations, turbojet installed thrust, installed-thrust methodology, piston-engine and turboprop performance.

Aircraft propulsion systems generally consist of an engine and a means to generate thrust, such as a propeller or nozzle. The propulsion system's thrust must balance the airplane's drag when cruising. 

Here are some types of aircraft engines:

Turbojet: A jet engine that uses a turbine-driven compressor to compress air for fuel combustion. The engine produces thrust by spraying a high-energy gas stream from the exhaust nozzle.
Turboprop: A turbine engine connected to a propeller by a reduction gearbox. The turboprop has better propulsion efficiency than a turbojet at flight speeds below 500 miles.
Turboshaft: Similar to a turboprop, but the propeller is supported by the engine and the engine is bolted to the airframe. Turboshaft engines are primarily used for helicopters and auxiliary power units.
Turbofan: A jet engine with a bypass fan that directs a large mass flow rate around the engine core. 

Other types of jet engines include ramjet, pulsejet, and scramjet. 
 

Related Test: Aircraft Design Practice Test: Propulsion and Fuel System Integration

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