Mark Jones' KR-2S Belly Board Speed Brake
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The toggle switch that is labeled Flaps Up / Flaps Down is actually the Belly Board switch. This is a DPDT momentary on in both directions. The switch is located directly above my mixture control on the instrument panel.
This is the linear actuator which controls the belly board. It has a travel of 7 inches and was bought from Van's Aircraft. Yep, the same actuator that is used for flaps on a RV.
The actuator is mounted to the seat back upright rails and pivots on one bolt there. It then extends down through the fuselage and attaches to the belly board.
This shows a little more of the overall installation of the actuator.
The board in the full down position. It is attached to the fuselage with a piano hinge which spans the entire length of the board. The hinge is riveted to the board with solid rivets.
This is the board in the up position on the bottom of the fuselage. It is made from 1/8" x 9" x 30" 6061-T6 aluminum. The photo is distorted, things really are nice and square and straight.
This is a side view of the board in the fully extended position. The board can be stopped at any point through the range of operation simply by releasing the momentary on switch. This gives me a full option of different deflections.
This is the attach point of the actuator to the belly board. The hole in the fuselage is barely large enough for the bracket to pass through.
This view shows the forward side of the rear spar. I have laminated 1/4" birch aircraft grade plywood to the forward side of the rear spar from the top down to the floor and the full width of the fuselage. This gave me a lip of about 1" between the bottom of the spar and the floor. I then fabricated six angle brackets from 1/8" aluminum 6061-T6 angle. These brackets were bolted to the plywood lip. The piano hinge on the belly board was then bolted to these six attach points.