Hydraulic Jacking Extension Box
I've mentioned this before and so have others. Seeing as how propshaft position is so important, and setting it high for speed compromises other things, why isn't there a hydraulic jacking extension box with about 4" of travel? I know a good setup man with a season of racing trial and error can get it right for most conditions, but I'd rather push a button and watch the speedo. Rather than fixing the drive at a compromise position, you could go 2" down for planing and cruising, and 2" up for speed.
Hydraulic Tunnel Extension Flap
(air flap on the bow, not tunnel tab at the stern)
We focus a lot on the design of the running surface in a cat, but the aerodynamics of the wing (the deck and tunnel roof) must be just as important at high speed. In T2x's history of cats, the idea of air flaps was proposed in the '60s. Was this ever done?
I picture a sliding flap that extends the deck, filling in the tunnel roof between the sponson tips, moving the center of lift forward slightly and increasing lift at lower speeds. Trim it back at higher speeds to reduce the need for negative trim on the drives. Once again a good setup man would have the boat balanced for known racing and load conditions, but I'd rather push a button. Even if it didn't work, it would be worth about 10 mph at the dock.