Henry Preiss is a sailplane designer.
He was a longtime friend and neighbor of Richard Schreder and they worked together to develop and build several examples each of the RHJ-7[1] and RHJ-8 two-seat sailplanes, and also the RHJ-9 and RHJ-10.
[2][3] The RHJ sailplanes were developed on-the-fly; neither Preiss nor Schreder kept detailed plans or design drawings, and made only what sketches were necessary for the basic engineering validation of the structure.
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