Airfoil Cargo Drag 
Vintage Aviation News
JUNE 18, 2025
Palmer and his team created wooden models of various airfoils, engine cowlings, and tail surfaces in a rented garage before bringing them to Caltech in Pasadena, where they utilized the school’s wind tunnel to test the designs until they were satisfied with the results.
Flying Magazine
MAY 6, 2025
It retained the classic, high-lift Clark Y airfoil, but the span of its four-position semi-Fowler flap span was extended. Tie-down rings are provided for securing cargo in what is then a large space. The tailwheel can be kept on the ground if desired for soft or rough fields, but the extra drag prolongs the takeoff roll slightly.
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