The construction of the Dakota Hawk is of wood, with a wooden geodesic-construction fuselage and an I-beam wing wheel pants available as options.
2.
Early RS-15 models featured wings that were essentially the same as the HP-16, and using the same one-piece machined aluminum I-beam wing spar.
3.
The wing structure includes extensive use of carbon fiber, both in the sandwich skins and in the tapered I-beam wing spar which uses pultruded carbon rods for the spar caps.
4.
The main issue is that the semi-circular beam wing configuration incurs increased profile drag and weight penalties over a conventional wing of the same lifting planform, and a common straight wing could provide almost the equivalent lift enhancement when exposed to the same slipstream induced increased dynamic pressure.
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