no
The effect of a hole on a paper airplane would depend on the type of paper airplane the hole is on, and where it is on the aircraft.
no
Well, if you want a certain TYPE of paper airplanes, and how many are there of that type, ask that. There is no real answer. A paper airplane is probably being made right now!
I know!
I would say no.
aerodynamics
gliders
the lighter the paper the easier the lift.Heavey paper will drop quicker.
Type your answer here... no
Yes.
Wax paper works good for strong, high-flying planes.
Generally, it is optimal to make a paper airplane symmetrical. I am not sure I understand what you mean by type of symmetry. However, some paper airplanes can be designed to be asymmetric and remain straight flying.