I actually built my first control line model a Frank Hawks Time Flies -in 49- powered by a Atom 09 -but even whipped -it would not leave the ground
Next up was a Maverik- it did fly -for a moment
finally I built a Brave with a backport 23 O&R got me into the air on controline stuff-
I was made aware back then - what really made models work and a friend traded me flying in an Aeronca Champ and a Ercoupe for me helping him learn control line flying
a fair trade for a Jr High kid!
I learned "aeronautics" using the time honored OTJ approach.