The average weight is about two ounces a square foot of lifting surface, which is about the same weight a square foot as the Eddy kites when all the surface is included in the estimate.
The propeller screws through the air, and its blades, being set at an angle inclined to the direction of motion, secure a reaction, as in the case of the aeroplane's lifting surface.
Remember that this only applies when it is hinged to a lifting surface.
If the surface to which they are hinged is not a lifting surface, then they should be rigged to be in a fair true line with it as illustrated above.
If the controlling surface is, as illustrated, hinged to the back of a lifting surface, then it should be rigged a little below the position it would occupy if in a fair true line with the surface in front.
The wings were cambered, according to the curve Lilienthal had decided most efficient, and contained about 180 square feet of lifting surface.
Their first glider was a biplane, with 165 square feet of lifting surface, as illustrated in Fig.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "lifting surface" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
