× Welcome to the CPL Aerodynamics question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.


  • Posts: 12
  • Thank you received: 0

lcanning created the topic: Turbocharged

Hey team.

Just have a question regarding the performance that comes from a turbocharger.
As stated in the textbook, with a turbocharger comes a higher volumetric efficiency and enables the ability to reach a IAS for best Lift/drag at high altitudes.

My question is what is the difference in range between a normal aspirated engine compared to a turbocharged engine

is it with a normally aspirated engine that it should always be operated at a low altitude at full throttle height and for a turbocharged engine it should be flown at a high altitude at full throttle height.

This was one of the questions I had in my exam

Thanks team

Please Log in or Create an account to join the conversation.

  • John.Heddles
  • Offline
  • ATPL/consulting aero engineer
  • Posts: 853
  • Thank you received: 107

John.Heddles replied the topic: Turbocharged

For a given aircraft/engine combination, best range will be approximated by operating at full throttle height for the target power setting which comes from an SGR analysis. (You will be familiar with the graphical technique to find the appropriate speed from which you can work backwards to find a power setting). For a constant speed propeller, we would also use minimum RPM and the appropriate MP for the power setting sought. (We are presuming that there are no strange wind shear variations with height which might change the details a bit).

For our purposes this target will occur at one density height. This, generally, is going to see the normally aspirated airframe/engine at a lower level than the turbocharged example.

Engineering specialist in aircraft performance and weight control.
The following user(s) said Thank You: lcanning

Please Log in or Create an account to join the conversation.

Time to create page: 0.070 seconds