Thick white smoke billows as the A-1 Skyraider 'Wiley Coyote' fires up its radial engine during a Tennessee Museum of Aviation event in May 2019. A ground crew member in a high-visibility vest oversees the start-up while other historic aircraft wait nearby. Engine smoke like this, caused by oil pooling in the lower cylinders overnight, is a familiar and celebrated sight among fans of vintage radial-engine warbirds. Project: 219252