I've always used a single piece rod for LPR.. 1/8 and 3/16. For boost gliders I use a 1 piece 48" rod. It's long enough to accommodate front engine gliders while still having at least 36" travel length. I've also got a launcher for my Carlisle Mark II Rock-A-Chute replica that uses a 5/16" wood dowel.

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Just remember...G. Harry Stine's first ever model rocket was an RTF !

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