There are many ways you can do this. One way would be to simply anchor the object and then raise it above the ground. Another way would be to use free models.
Go to roblox studio. Then go to your place in edit mode. After that make sure the explorer and properties windows are open. Then click on the brick you want invisible and in the properties box scroll...
Airplanes exploit a loophole in the physics of air pressure. It's a mundane sort of thing, compared to being IN a plane, but essentially, air gets bottlenecked trying to go around an airfoil (such as...