Henry Preiss
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Longtime friend and neighbor of Richard Schreder, Preiss worked with Schreder to develop and build several examples each of the RHJ-7 and RHJ-8 two-seat sailplanes, and also the RHJ-9 and RHJ-10. Preiss also finished the Schreder HP-19.
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.