Ed Kyle wrote:

R-7 may not have matched the Atlas mass ratio, but it is hard to argue
with its results. R-7 (still the world's busiest launcher) has now
flown
about 1,150 more times than the stage-and-a-half Atlas (retired in
2004)
did!



Yeah, it was a resounding success...but jeeze, those engines are about
1/2 step forward from a V-2's.

Pat