These are always measured against a standard ~5kts wind, I think. This 60 metres is thus the speed the Storch needs to run up to take-off speed in a very light head wind. The distance would change with the ship steaming into an oncoming wind, and as has been suggested some sort of rubber catapault arrangement.recall reading somewhere 60 meters of road to take off
P.S. I know the 32 mph stall speed mentioned there is different from Kermit Weeks' 25 mph - given Weeks' professional experience of a wide variety of wartime types and aerobatting them I'm inclined to go with him. If you think about it - 7 mph MAY not seem a lot of a difference, but its a big chunk of 32!