I would guess it is cost and demand related.We'll never really know for sure why the Pro Series II engines were discontinued, but it's almost certainly because they weren't profitable for Estes. It's much more profitable to sell their own engines than re-labeled Aerotech engines. This is also why all current Pro Series II kits now available will fly on Estes engines (when built stock).
I keep hoping my 2 LHS will blow out their Estes PSII engines, but there they sit on the shelf, at full retail.
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