Ya gotta love the history
RAAF Beaufighter pilot Raynor Barber
"We had a very specific way of approaching targets. We flew at sea-level to keep under radar and out of sight, as surprise was crucial. It was not advisable to turn around and look back at that stage as the sea would be swirling just behind the wing from the wash from the propellers. The propellers themselves were less then a foot off the water. This caused trouble if their was an inexperienced pilot on the mission. One would occasionally panic when he saw how low he was and automatically pull the aircraft up into the air. If this happened once, the Japanese radar would know we were coming. If it happened a couple of times they could pinpoint our intended target from our flight path and be ready and waiting. We lost too many aircraft that way. We got wiser as we got older and never allowed an inexperienced crew to go out on a job like that. We would be one aircraft short rather then take an inexperienced pilot."
Apparently noobs were a problem then too. Looks like 65 feet would have been nice