Great Planes shaved weight from nearly every component of the F-86. A specially made lithium-ion battery is only 0.48 ounces. The smaller, stronger engine features electromagnets custom-built with ultrathin copper wire. The wires produce a stronger magnetic field, and therefore more power overall, with less mass. The plane's custom servos—the attachments that move the wing and tail flaps—are 78 percent lighter. The engineers also improved the plane's aerodynamics. They mounted the servos completely within the lightweight EPS-foam fuselage, something no other R/C-jet maker has done.