Wing walks are provided to make an area to strong enough to walk on. Many people think that an airplane must be really strong to fly! That's not always true. The wings are made of Foam and fiberglass. They can withstand a total load of 3G's at 1200 LBS. That's 3600 LBS of force spread evenly across the surface. The key phrase is "Evenly across the surface". The KR2S has 82 Square feet of surface area, so that means 1 square foot of the wing can only support 43 LBS. A person's shoe applies all your weight in less than 1/2 a square foot. In the picture, you can see 2 foam ribs and 2 wood ribs closest to the fuselage.
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