Allison engines, those ones....US designs.
I dunno why but I've never been interested in the RC flying models and you may have put your finger on it. The noise just leaves me cold and removes any sense of history.
At Ardmore airfield not far from my house in South Auckland, we have both a P40 and a Mustang, and had the pleasure of watching them both at an airshow for the RNZAF 100 yr anniversary. The P40 looked and sounded great...until the Mustang came on. Carthorse vs stallion.