I'll take a very safe guess here and say that Steve was using the expression "in the noise" to refer to meaningless differences in the measurable data, not actual acoustic noise. It's a common term in engineering and data analysis circles and has nothing to do with what you hear when you wear your helmet....J\V said:.... Are you suggesting that there was little measurable difference in drag between the helmets, but some were noisier than others?...
-Dave