Originally Posted by
A Squared
I haven't flown the Convairs, but I'd expect that it didn't have a blue line, but rather V speeds which were calculated based on takeoff weight, altitude and OAT. Blue-line is more light twin figure. It's possible though, that era was kind of a transitional period for aircraft performance theory.
So it would rather be V2 then, like with a jet. Anyways, the numbers would be interesting. They seem pretty fast passing the 172 in the 2nd video.