Why airplane's main part doesn't seem to move very well?

So, I'm making a flight simulator that would work out similar to VFS. Unfortunately though, as I coded a plane then, all of a sudden it won't move.

I tried many times like:

1. Setting the NetworkOwnership (which doesn't work because it works with BodyGyro and Velocity)

2. Changing from ModuleScript to LocalScript (I used module scripts)

3. Trying to optimize the parts of the plane

I have no idea what's going on with this plane. Here's the video demonstration: https://youtu.be/CPYM3OTfn0I

I'm so sorry if I can't give a code to show it to you (it works by multiple module scripts), instead, I will upload my .rblx file. https://www.dropbox.com/s/rx9rf6de4ph5uo0/flipflop.rbxl?dl=0

(By the way, the plane moving script is found on Simulator script.

Thanks for your help!

It took me 2 days to solve this issue.

All because of ROBLOX physics issue! I went to the properties, physics and adjusting tweaks.

I recommend to set these options here: Allow Sleep = off Physics Environmental Throttle = Disabled Throttle Adjust Time = 0.00001 seconds

If one of you have this problem, I highly suggest you set this first.