I propose a modification on the CH 47 Chinook Helicopter to increase take off weight, lift off, stability near the ground on take off and ground effect or ground cushion on landings. The modification will be retractable slots on the protruding extended exterior base of the helicopter which will be attached parallel to the length of the rounded edge of the base. This modification will be a “C” shape cupping the curved surface as if it were the leading edge of a wing. The slots will be exactly as those on a STOL aircraft on the leading edge of the wing. On the topside of the slot there will be a lip, which flares outward, which will double as a step or area for a guide rope, hook or tie down.

Such a flare will ensure maximum amount of airflow in the vicinity makes the continued laminar flow to the flat belly of the aircraft. Airflow from both sides of the round edges will collide increasing the air pressure underneath the flat belly of the aircraft and lift it up. Think of a hydro-craft scenario, we will be using additional principles of ground effect to enhance the landing and taking off characteristics of the Chinook. During nose down forward flight this will also assist the aircraft by allowing for maximum airflow to reduce drag, as slots do on any aircraft, at higher speeds retraction is a possible option if this feature makes sense. Wind tunnel tests should be performed at different angles of attack for forward flight as well as downward airflows to simulate the force of the rotor wash. Rotor wash is energy, I propose to use all the energy we can to it’s absolute maximum since the cost to produce it are paid in fuel and additional weight.

These slots will help the air make the corner as the rotor blades blow massive amounts of air downward, forcing it under the aircraft for ground effect. This will allow hovering under less than normal power and allow the aircraft to have softer landings. Imagine standing upright with a piece of plywood and letting it fall to the ground with you on top of it, no hard landings will occur. For lifting wind sensitive cargo the slots can be retracted if such a feature is needed. I propose these add-on slots not be made of composite due to the chance of fire causing them to emit cyanide gas, unless the undercarriage is already made out of such material, as is the case on some of the models. If so then to prevent problems with fumes in case of fire or if used in aerial fire fighting or in the war zone, then I propose they be coated with ceramic material and interlaced with other non-flammable materials.

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