challenging your old TF knowledge......
I posted a reply in the Vintage forum but this thread at least had some post.
N-13 was a profile, 24" span built up wing Hawker Hurricane C/L model.
Others in the series were a Cosmic Wind & P-51B.
Would be happy to cut out & mail the magazine ad from 1970 if you like...
S-20 was Zero, S-21 a Hellcat & S-22 a Thunderbolt; all 1/2A Control line models.
Regards,
Scott