Describe the issue
consistency basically

Crash report/logs (if applicable)
Upload your crash report or logs here if they could be of help when trying to diagnose the issue. Please use https://mclo.gs/ instead of uploading the file directly.

Additional information
https://www.curseforge.com/minecraft/mc-mods/hang-glider

This would require quite a different physics model to make sense, which is a lot of work for something that probably wont be used much. This suggestion is currently considered out of scope.