The Jupiter, Entrop and Hedlund all had the "S" up front between the spoons.
My brother's C-D-F-X had a 3/8 "S" between the back of the sponsons and the after plane. The concept, as Joe Swift told me, was to keep the boat from getting airborne. Might have worked at slow speeds...
You can see, that the "PLAN" was for the driver to ride near the steering wheel and "PROP RIDE"...as full length traps weren't invented yet..
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