Eternal rivals, even to this day it remains debatable which was the better plane, the Bayersche Flugzuegbau Messerschmitt 109 or the Vickers-Armstrong Supermarine Spitfire. But the funny thing is that both those planes have had things happen that also happened to the other plane. For example: They both flew with the other's engine. This Mk.V Spitfire was captured intact in France in 1942 and transported to Rechlin AFB for testing. The boffins decided that it would be interesting to see how the aircraft would perform if they would switch its Rolls Royce Merlin engine in favor of a Dailmler Benz DB601. One thing that became apparent right away is that it improved the cockpit's visibility over the nose massively, since the Daimler is an inverted V-12. This is profile of a stock Spitfire Mk.V And here's the Daimler fitted Spitfire The Spitfire quickly proved it self to be a pleasant flier and popular by the test pilots, sadly, it was destroyed during a bombing run on Rechlin. These are Hispano Ha-1112 "Buchon" fighters of the Spanish Air force. Now the Buchon is a Me-109G "Gustav" model built in Spain but with the stock of Daimler-Benz engines drying up, the Spanish were forced to look elsewhere to power their "Hundertnuens" and after at first fitting local engines which were underpowered, settled on fitting Rolls Royce Merlins. Keep in mind what I just said about how the visibility out of the cockpit of a Spitfire improved when the Germans put a Daimler in that plane. Fitting a merlin into an Me 109 radically changed its appearance. This is the profile of a German built "Gustav" with the Daimler engine. And this is a "Buchon" it's the same aircraft and the Merlin makes a HUGE difference. This "Buchon" shows the higher nose to very good effect. But the "Buchon" proved to be a slamming success and many "Messerschmitt" currently flying is actually a Buchon, either with a Dailmer retrofitted or with its stock Rolls Royce Merlin still in place.