During Height Velocity Chart development testing for Transport Canada or FAA certification (don't know about CAA or JAA), the pilot reation time delays depend on the area being explored. Typically, for regions which fall below the 'knee' of the chart, the delay is 0.5 seconds. Areas above the knee are subject to 1 second. I don't know if these were the criteria the Robinson was certified under, but it applies to most types being certified in Canada or the US today.