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Aeagle.279 net.space utzoo!decvax!harpo!eagle!karn Wed Apr 21 15:00:05 1982 Saturn V engines I recently bought one of those "laser prints" of NASA photographs, and I must say that they are very well done. One of them is a picture of the Apollo 15 launch, and I noticed something that I'd seen before on shots of Saturn V launches.

If you look carefully at the end of the first stage engine nozzles, you will note that there is a region below the nozzles where the exhaust is a dark reddish color, instead of the brilliant yellow-white of the exhaust farther down. Does anyone know what causes this? I would think that the propellants would have thoroughly mixed and burned before leaving the engine nozzle.

Phil Karn Bell Labs Murray Hill

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