longer ron, just read again my previous message
"From all the data that Orville and I accumulated into tables, an accurate and reliable wing could finally be built."
Wilbur Wright
"Scaling from the tunnel to the Wright Flyer ... showed the Wrights’ drag prediction to be 300% too high, resulting in highly inaccurate efficiency predictions. ... the Wrights’ quantitative data was not applicable to full scale design."
The study of Michael Gary Dodson
see:
http://www.pprune.org/aviation-histo...ml#post8507801
It is self evident that W. Wright said the wind tunnel tests had generated numerical data that had been used after that for calculating and designing large wings while the tests done by Michael Gary Dodson show the predictions for drag would have been 300% too high had the two brothers tried to scale up their data, obtained using their wind tunnel.
To be more clear if, as an example, one has a small wing and measures its drag coefficient, with the help of a small wind tunnel, this coefficient is simply useless for a wing of the same shape but with a surface: 25, 50, 100 times larger.