Gmod WAC helicopter pack problem

Ummm… Well, the problem is that I can start the helicopters, but can’t make them take off like they should, I tried it on a different computer, it worked fine, but this one appears to not take off, anyone know why it’s doing this, and how to fix it, I’d appreciate it.

Go to options under the Q menu and you will see WAC options, change the startup button to something different. Same happened to me

Sorry, but can you explain it a little more?