The Schweizer 2-33 is a very popular training glider, I got to do some glider training on one at the main Glider training base in Boulder Municipal Airport in Colorado in the 90’s. Glider training still goes on at this airport, check out  https://www.milehighgliding.com/ to learn more.

The aircraft was easy to fly and had simple & conventional construction.  Like the contemporary 172’s & PA-28’s peak production was in the 60’s – 70’s.

https://en.wikipedia.org/wiki/Schweizer_SGS_2-33

http://www.fiddlersgreen.net/models/aircraft/Schweizer2-33.html

The market’s voting dollars however chose sleek composite sail planes in the early 80’s ending production on the 2-33.

The 2-33 is still a good gliding trainer. Like Acrobatic training ability to grow performance skills, glider training gets conventional pilots more skills in the case of an engine out.

The 2-33 also has the same NACA 63-618 Airfoil as the SP-500 offering Aerodynamic & Structural efficiency

Not too many RC options, none on outerzone yet. If your gun-ho for a RC model Aviation Concepts has a 1/3 scale version with a mammoth 17′ wing span

https://www.aviationconceptsrc.com/1-3-scale-2-33

& a 1/8 scale version

https://www.aerosente.com/a078-schweizer-sgs-233a-18-scale.html