Streamy

Sorry, I don't think I was clear in what i wanted to do. I was hoping to set the player in fly and have the player ascend upward. I am able to set the player into fly and have them ascend using player.motionY but they either ascend slowly and not for long or they go the proper distance but ascend much too fast. I just wanted to know if there was a way to have a player ascend while flying at a constant rate.

So I've just started working with mods and I'm relatively new to Java so I would like to keep the "LEARN JAVA" comments to minimal, This is more of a question than a support thread but I'm trying to run a command that makes a player ascend at a slow speed 100 blocks upwards. I must admit i'm still learning and I may look like an idiot to some of you but when i use player.motionY It sends me upwards only a few blocks (Based on the value) I want to know how i would make a player ascend on the Y axis slowly at a constant rate and stop after ascending 100 blocks. Thanks anyone who can help!