I have some detail on various crash boats and HDML operated in South Africa in the Second World War. I think they started off with British boats powered by Merlins, which thereafter were in short supply due to the Battle of Britain. Thorneycroft or The British Power Boat Company come to mind. Thereafter, a contract was placed with an American company for crash boats, using the Brit boats as a model or benchmark. I’ll find out tonight and post some info tomorrow…