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A friend of mine works at one of the local airports. Recently he spotted a seaplane with pontoons and front prop. But it had a prop behind the tail also. What the....? Who knows what this could be?
I hate when this happens. I got the right description with the wrong picture. Here's the right picture. I'm disappointed as i'm sure you are too. My apologies. but I still have the same question. What could this little prop be for?
As far as interchangable parts go, in the military -4 (Illustrated Parts Catalogue) every sheetmetal part has the suffix "CP" behind it. This meant "Corrosion Proofed" and unless you ordered a seaplane version, you didn't get this part in your plane. Every rib, stringer, etc was alodined and primer before assembly on the military birds, Birdogs, Skymasters, Blue Canoes, and Tweets all had this. I don't beleive that many 337's were ordered with seaplane options.