>>6419017You could always get a 4-channel RC Cessna. These days you could probably find one ready to fly for $200 or less. You could have the plane sitting on a table and use the transmitter to throw the rudder, ailerons, and elevator any which way, and even hand the controls to students to have them react to scenarios you describe.
You could even remove the prop if you want to kill any chance that a student would accidentally fly it off the table.
Here's a link for a 182. I'm sure there's a 172 out there somewhere if you need it to be that specific.
https://www.horizonhobby.com/product/airplanes/airplanes-14501--1/bind-n-fly/umx-cessna-182-bnf-basic-eflu5650 
