Near the end of WW2 the US Navy was losing a lot of patrol aircraft that were powered by R2800 P&Ws. Some of the losses were attributed to loss of power at low altitudes and it was blamed on carb ice. The Holly Corporation came up with a new design that used a variable venturi much like the operating principle of an SU carburetor. They put them on the R2800s and the loss rate went up. It seems that these carburetors would make ice faster than your refrigerator freezer. These carbs went into the bin and were replaced by a newer design Bendix Stromberg PD type carb and the problem went away.
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The Cat