Years ago, when I worked at a corporate FBO in Toronto [YYZ], I had the pleasure of servicing a Convair that was based on our ramp. It was mostly chartered when ever the "Toronto Maple Leafs" hockey team needed her to fly them to a game that was close to the Great Lakes. When ever she was towed into position, refueled, etc, and ready for engine start, it was always an "Amazing Sight" [and sound] to see the blue-ish orange "Flame" that would start shooting out the side of the engine cowling below the leading edge of the wing. It was especially Cool to watch the "flaming start up" at Night!!!
I can't remember what the pilots told me back then [a decade ago], about how the starter worked. Can someone please explain to me why there were Flames?
Also, can someone tell me what type of starter this was and if any other aircraft use it? I do remember a pilot telling me that the C-130 Hercules had the same engines. Is this true?
In this photo, you can see the exhaust port hole, on the side of the engine where the flames would shoot out during start up. [from what I can recall].
Photo © John P. Stewart
Photo © Jonathan Derden