The above flashlight features a rocketship design. An aperture in the nose cone emits light while the base of the rocket suggests a rocket propulsion nozzle. Mickey Mouse pilots the ship seated in the red nose capsule while passengers, Minnie Mouse, Donald Duck, and Pluto ride in the rear. Portholes along the body of the rocket provide the passengers with a view of space. A fundamental flaw in the design is the sizing of the fuel tanks. Nearly the entire volume of the ship is devoted to a passenger compartment. Rocket engineers measure rocket performance by a figure of merit called "mass fraction." This is a ratio of the fuel's mass to the entire mass of the rocket. The mass fraction of Mickey's rocket is too low to ever reach orbit. By use of staging rocket engineers improve on the mass fraction ratio such that the overall mass fraction is a product of the ratio of each of the stages. With regard to Mickey's "single-stage-to-orbit" (SSTO) system, the benefit of staging is absent.