At one time, Mini-Engines were 3/4" longer and available as B3 engines!
Both Centuri and MPC made B3 mini engines. Estes only sold the shorter As.
I remember hearing about CATOS with the Centuri Bs.
This small flyer was included in Centuri orders for the B engines after they were discontinued. Centuri continued selling mini engines, just the shorter A engines.
For a short time, Centuri included 3/4" long spacers with their mini engine packs.
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