Perhaps not for general publication but ...
The designer provides all of the pertinent information in the construction manual and documentation that comes with every RV kit.
There is also a chart on the web site
HERE
It may be too late for you at this point, but it is highly recommended that when anyone buys an already flying RV, that they make sure they get the construction manual, drawings, and other documentation that was used during construction.
Not only does it have the info. you are currently seeking, but it is what you would use in the future as a parts manual, and reference for doing maint. or any possible repairs that might be needed.
Since you brought the RV-6 data into this thread, I would be very interested to know how the top of the yellow arcs were determined and if exactly the same method was used for all models what is the element that caused the RV-6 to be limited to 210 mph (the same as the RV-4 and RV-9) while the RV-7 value is 230 mph (the same as the RV-8 and RV-10). Since all of the airplanes are different it is impossible for critical analysis to predict the same precise structural limiting speed for multiple models. Bob Mills flies a RV-6 modified as a Super with the big 6 cylinder Lycoming and his race speeds including turns are:
Race Record (RR)# Race Date Class Aircraft Type Pilot Speed Kts Speed MPH
1073 Thunderbird 150 10/8/11 Sport FX RV Super-6 Mills, Bob 220.79 254.08
1139 Rocket 100, 2011 11/19/11 Sport FX Rocket Six Mills, Bob 219.12 252.16
773 Rocket 100, 2010 11/20/10 Sport FX RV Super-6 Mills, Bob 216.41 249.04
962 Big Sky Air Race 7/9/11 Sport FX RV Super-6 Mills, Bob 213.07 245.20
807 Taylor 150, 2011 4/2/11 Sport FX RV Super-6 Mills, Bob 212.55 244.60
626 AirVenture Cup 2010 7/26/10 Sport FX RV Super-6 Mills, Bob 212.53 244.57
661 Great Canadian Air Rally 2010 8/22/10 Sport FX RV Super-6 Mills, Bob 211.56 243.46
690 Pagosa Springs 2010 9/26/10 Sport FX RV Super-6 Mills, Bob 210.50 242.08
557 Great NW Air Race 6/13/10 Sport FX RV Super-6 Mills, Bob 208.57 240.02
481 Rocket 100 2009 11/22/09 Sport FX RV Super-6 Mills, Bob 208.54 239.98
494 Taylor 150 4/11/10 Sport FX RV Super-6 Mills, Bob 206.07 237.14
428 Pagosa Springs 100 2009 9/27/09 Sport FX RV Super-6 Mills, Bob 203.88 234.46
Twice I have flown a two way speed trap run in competition and I have the certificates for 220.017 mph and 226.74 mph just as a matter of record (not saying it is safe) in our RV-6A.
Since I like to go fast and race it is not likely that I will stop modifying the airplane in the immediate future. I would like to know if there is a weak element in the RV-6. I know there is a safety margin used in setting the red line on the airspeed indicator but given the same two numbers assigned to quite different aircraft across the RV line there seems to be some arbitrary limit setting in the process.
Bob Axsom