Cessna 172 aerodynamic derivatives

[Paolob]

I'm looking for a source for aerodynamic derivatives for
airplanes like Cessna 172 and 525.
I've seen the data from the Darcorp examples and
from the LaRCsim model in Flightgear but they
differ.

Thanks in advance

Paolo

[davele...@my-deja.com]

Its nice to see sci.aeronautics come back to life!

[Moderator's note: It's even nicer to have you posting on it again.
For those of you who don't know him, Dave is a real expert and we're
lucky he's here. MFS]

According to a table in one of Roskam's books the following hold for
the Cessna 172:

Condition: cruise
Altitude: 5000 feet
Speed: 219 ft/sec
CG = 25% MAC
Sref = 174 feet^2
Span = 35.8 feet
MAC = 4.9 feet
GW = 2645 Lbs
Ixx = 948 slug-feet^2
Iyy = 1346 slug-feet^2
Izz = 1967 slug-feet^2
Ixz = 0 slug-feet^2
CL = .31
CD = .031
CT = .031

Longitudinal: Lateral:
Cmu = 0 Clbeta = -.089
Cmalpha = -.89 Clp = -.47
Cmalphadot = -5.2 Clr = .096
Cmq = -12.4 CldeltaAileron = .178
CmTu = 0 CldeltaRudder = .0147
CmTalpha = 0 Cnbeta = .065
CLu = 0 Cnp = -.03
CLalpha = 4.6 Cnr = -.099
CLalphadot = 1.7 CndeltaAileron = -.053
CLq = 3.9 Cndeltarudder = -.0657
CDalpha = .13 CYbeta = -.31
CDu = 0 Cyp = -.037
CTXu = -.093 Cyr = .21
CLdeltaElevator = .43 CydeltaAileron = 0
CDdeltaElevator = .06 CydeltaRudder = .187
CmdeltaElevator = -1.28

-------------------------------------------------------------------
David Lednicer | "Applied Computational Fluid Dynamics"
Analytical Methods, Inc. | email: da...@amiwest.com
2133 152nd Ave NE | tel: (425) 643-9090
Redmond, WA 98052 USA | fax: (425) 746-1299

[Dave Pinella]

davele...@my-deja.com wrote:

> According to a table in one of Roskam's books the following hold for
> the Cessna 172:

<snip> A bunch of aero coefficients for the C172

Does anybody have a Pmarc or Cmarc (the same thing actually) paneled
model of a Cessna 172?

Thanks!

Dave P, AeroLogic