The 20A has been used in the bulk of the Estes kits offered in the BT-20 tube size. The Ninja, Wizard, Zinger, Viking and Hi-Flier are just some of the kits that can be built using this cone. The 20Y is less versatile from a cloning standpoint, having only been used in the Yankee, but it would likely translate well to many of your own designs.
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