Bas, already tried I believe by the IJN.
In Akagi 's predecessor, Hōshō, the hot exhaust gases vented by swivelling funnels posed a danger to the ship, and wind-tunnel testing had not suggested any solutions. Akagi and Kaga were given different solutions to evaluate in real-world conditions. Akagi was given two funnels on the starboard side. The larger, forward funnel was angled 30° below horizontal with its mouth facing the sea, and the smaller one exhausted vertically a little past the edge of the flight deck. The forward funnel was fitted with a water-cooling system to reduce the turbulence caused by hot exhaust gases and a cover that could be raised to allow the exhaust gases to escape if the ship developed a severe list and the mouth of the funnel touched the sea.
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