1st CL was an Aurora L-19 Birddog with Aurora 049 from Christmas 1959. I was 7 years old. It survived about 2 laps.
L-19 is in the lower left of photo with "hanger box" behind.
2nd CL was a Scientific Piper Super Cruiser with solid balsa fuse and flat wing with a Cox 049. It survived crashes and repairs long enough to for me to get the hang of it.
Thats me on the left. K&B fuel with big round dry cell battery.