Not too sure what you mean by modifications, but I'll have a go.
A basic one is those little flaps on the side of the wings; always a good one to keep it stable. I'm not sure what the different between flaps that go up or down.
Another is the stabilizer, by a simple vertical cut in the body of the airplane (The strip you hold), then folding the other way so it makes a triangle which stabilizes the airplane.
Then there is my personal favorite: ailerons. If you don't know what they are, I advise you to look them up, they are very interesting.
You can make them by cutting two slots out of the back of both wings. Make two cuts on a wing and you should get a small rectangle that can be folded up or down. Do this to both, and by changing their position before flight, they can make the plane do many things, it's cool to experiment.
Hope these help!
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.
Yes, the design of a paper airplane can effect its performance.
Leonardo da Vinci made the first paper airplane
Farther than any other paper airplane that i know of
A paper airplane cannot fly without a wing.
In a paper airplane experiment, the independent variable is the factor that is being deliberately manipulated or changed by the researcher. This could be the type of paper used, the design of the paper airplane, the angle of launch, or the force applied when throwing the airplane.
Paper, because it is much lighter, and a foil airplane will take up much more mass.
What wing design for a paper airplane will soar the farthest
i would have to show you but i can make an extremly good paper airplane
put the paper clip at the front f the paper airplane.it helps the airplane to fly!
The range of a paper airplane varies by model.
paper airplanes didin fact come before orvill wright.