Flight Model Questions

[mytai01 1]

I remember a few years back seeing a good description of the fight model coefficients that control how player aircraft behave. Does anyone know if a good description of such things as these:

 

CLa=0.7907

CD0=0.0013

CDL=0.0022

Cmq=-0.1853

Cmad=-0.0161

Cyb=-0.0236

Clb=-0.0752

Clp=-0.0786

Clr=0.0242

Cnb=-0.0797

Cnp=0.0022

Cnr=-0.0048

 

Is anywhere to be found?

[+streakeagle 866]

Very old stuff from Wild Elmo that was copied from SimHQ and repasted:

http://bbs.thirdwire.com/phpBB3w/viewtopic.php?f=3&t=554&p=3295&hilit=coefficients#p3295

 

The main numbers you would want to play with are Lift slope, CLa, zero-lift drag, CD0, and lift-induced drag, CDL.

CD0 mainly effects top speed, but also effects level acceleration and sustained rate of climb.

CDL mainly effects sustained turn performance. Aircraft with a lot of drag for a given lift coefficient bleed speed faster.

CLa works together with CLmax to determine stall speed, max instantaneous turn rate, and influences just about everything else.

Lift to drag ratios (determined by the combination of all three of the above terms) affect glide slope and ceiling.

 

The rest of the numbers are all about stability and moments. They are very important, but hard to calculate or even estimate.

[+baffmeister 1,205]

I transferred Streakeagle's Thirdwire FM threads into notepad format, with some editing. I find them quite handy to use. ThirdWire FM Notes.rar ThirdWire Stall Notes.rar