Adapter 18 - 24 mm - Estes
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Adapts D engine mounts to hold a standard engine. Two simple steps transform a standard engine into a D size.
Rockets weighing up to 120 gr that would normally fly on C11 or D12 engines can be flown on B and C engines.
How to use it: Insert a standard engine into the adapter, and insert the adapter into a rocket.
NOTE: This motor adapter has been tested in products that use ESTES metal engine hooks. It may not work with other brands of engine hooks.