Now, what was the later event of #1 about, by Christmas! Something about an American manufactured plane that was employed, with variants, before and throughout WW2 (the other site's forum had totally missed this aircraft in their list).
1. What was the American naval plane used to shoot down an enemy bomber over Scapa Flow?
This one took some finding. The Hudson was not a naval aircraft & the action took place off Jutland. (Four ex-RAF Hudsons were used as transports by the Fleet Air Arm but the first of these was not delivered until June 1944.)
The first Hudsons were shipped to Liverpool in February of 1939. The Hudson Mk.I entered service with the No.224 Squadron of the RAF's Coastal Command at Gosport in the summer of 1939. By the time that war began in September of 1939, the Hudson Mk.I was also serving with No.233 Squadron, whereas Hudson Mk.IIIs were in the process of replacing the Avro Ansons that were serving with No.220 Squadron. The pilots of No.224 Squadron's Hudsons were the first RAF pilots to exchange shots with the Luftwaffe, which took place on the war's second day. On October 8, 1939, a 224 Squadron Hudson became the first aircraft of American design to destroy an enemy aircraft, when a Dornier Do 18D flying boat was destroyed off Jutland. Four months later, a Hudson Mk.III of No.220 squadron participated in helping to direct HMS Cossack in the boarding and seizing of the Kriegsmarine prison ship Altmark in Norwegian waters. http://home.att.net/~jbaugher4/a28_13.htmlPS.
The Hudson is recollected in FAA (Fleet Air Arm) history for one well known crash, when Admiral Ramsay of WWII fame was killed. Aircraft AM 550 of 781X Flight crashed on take off on 2 January 1945 at its base at Tussus-le-Noble, killing the pilot Lt Cdr Sir GJE Lewis, PO DL Morgan and Admiral Ramsay, Cdr G Rowell and Lt D Henderson.