Back when the Ercoupe was first certified, the check out, solo, and private liscense time time was reduced for "cooridinated control" aircraft, but with a limitation of the liscense.
This limitation was later dropped, I believe - just don't remember when. To keep sharp and current in all airplanes, I believe it is good practice to take check rides in a C-150 / PA-140, etc, just to keep the old noggin awake on what is required to slip and stall, and recovery from entry to a spin, etc. However, I don't believe there is any "legal" requirement to fly 3 control airplanes for a checkride. Regards Harry 93530
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