According to the SDK, the radius must be between .5m and 10m,
-500 < x1 < 500
-500 < x2< 500
-500 < y1< 500
-500 < y2 < 500
-500 < z1 < 500
-500 < z2 < 500
Using the Tello EDU app, the curve function works well.
Vertical Loop
Vertical Loop In Flight
Simple program to demostrate programming the Tello with Scratch.
YouTube Video
Download Scratch Project
Download and replace Tello.s2e Corrected flip block description and simplified other blocks.