Huh?

The horizontal stab is a standard 2% flat balsa airfoil, but the main wings utilize a symetrical thin cross section naca0012 (or is it naca0010?) airfoil.

These thinner wings have lower parasitic drag in flight, and actually HELP the plane to keep speed up. The thinness of the wings makes the plane fly further, due to the lesser drag, but the offset is that the wings provide a higher stall point than thicker wings.

Biplanes posess two wing surfaces and a large frontal cross section.

The combined effect of the frontal drag from the multiple surfaces is what slows the plane down NOT the thinner wings. The thinner wings actually help if anything.

As long as you keep up speed the plane WILL "fly far"... and of course the only thing you can trade for speed in a deadstick is altitude...