Hi everyone,

I am currently studying the Pitching moment of a 70deg delta wing at low alpha (<15) and low Mach numbers (M < 0.15).

From literature, my Cl and Cd values predict relatively close (10%) to experimental values - but my Cm data (pitching moment) is far out.

I understand that the pressure distribution on the leeward side of the delta wing is going to have a large impact on the Cm value - so if your vortex spanwise location is off - your Cm value will be off as well.

Has anyone working in this field - or could point me in the correct direction or suggest sources for experimental data?

Thanks Riaan

I'm not working on this and don't know of experimental data, but these suggestions came to my mind as alternates:

About which location are you calculating you Cm, and which location does the experiment use? This might be the source of the problem... if not, then look at the Cp-distribution if possible.

-- Jarmo

I took the same position and same non-dimensionalizing value of length...first thing I checked !