measuring air speed

[Acetronics2]

Hi, MacG.

To have a correct measurement ... Travin is the closest to the truth !!!

This is called Venturi effect, and it's used in Big wind tunnels. Pitot tubes would be too false here, due to the non isotropic flow.

But, before entering the Venturi section you must have to redirect air flow, cause of the disturbance created by your wing section, that would affect the mesurements. ( we can't suppose fluid is uncompressible here ... )

Remember at low Reynolds ( say ... 50k to 1M ), flow disturbances are close to pressures you measure.... you will be very far from sonic flow !!!

Back to the basic subject ... Your PC certainly is the most precise virtual wind tunnel you could have ... and there are lots of really good free software on the net !!!

http://www.designfoil.com/

Alain