Summat doesn't look right. Back in the dark ages, Polish Spitfire pilots boasted of "dipping" their wing tips in the Severn. I saw something like it when I was very small. I don't remember what the aircraft was save that it had rondrells on it. The wing tip did not seem touch the water and the wake started a foot or so behind. This is remembered through the filter of fifty odd years so don't bash me too much.