Here is an Estes Birdie....I think. I bought this with a box of rocket and model parts. This could have just been someone cloning the Birdie, but oh well looks like the real one to me. The Engine Tube is 2.75 inches long and I don't know if that is the right tube. The tube slides into the Birdie and there are little pins up by the head that hold the engine tube nice and tight but the tube extends by 1/8 out the bottom. There are 2 Shuttle cocks and both are in pretty good condition with a little yellowing and the Green stripe is a little cracked. The rings, Lunch Lug and Bt. look old also. There is no header card or instructions. Before I start I just want to make sure I have the right parts.

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from what I can tell the original used 'series III' short engines, the '73 version used mini engines(and is very easy to clone...takes about 10 minutes ).
rex