Thanks for your help.
wkitty42, no I did not remove the -master from the folder name:-( This was the problem. As soon as the folder was named "c152", the right plane is on the runway. Dumb mewbe question, sorry...
Hope that the develpment of the C152 will go on. Looks great so far.
By the way, I downloaded it from https://github.com/awall086/c152
Eskimo