Benair From Germany, joined Jul 2006, 7 posts, RR: 0 Posted (7 years 3 months 2 weeks 1 day 5 hours ago) and read 3320 times:
I am working on a research project for shock control in transonic flight. Currently I am trying to come up with some data about typical flight conditions during long range missions, where wave drag may occur. Important information for me would be how lift coefficient, mach-number, altitude, etc. change during a flight. I figure these information are some way or the other available from flight plans, however, I can't find any source to get a representative number of flight plans from.
Is there anyone out there to give me any tips on how to find these kind of data? Or are there any long range pilots that can give me some estimates at least on typical changes in cL and mach-number during a mission (preferably for A340 but any other type is welcome as well)?
Oly720man From United Kingdom, joined May 2004, 6688 posts, RR: 11
Reply 1, posted (7 years 3 months 2 weeks 2 hours ago) and read 3251 times:
Have you tried asking the airlines, eg LH, for such data?
During a flight, the cruise Mach number will hardly change for reasons of separation, especially on busy routes such as transatlantic.
Lift coefficient at cruise you may be able to make some sort of assessment from weight and fuel and wing area. In a long haul flight you may find that as fuel is used, higher cruise altitudes may be requested.
I don't know what the lift curve slope for the A340 is, but from here