Estes motors B6-6
Designed for the upper stage of your multi stager.
The engine long delay is designed for upper stages or for very light rockets.
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When to use this engine
The B6-6 is a typical engine for the upper stage of multi-stage rockets. Its long delay, in fact, allows the upper stage to reach all the height that it can before deploying the parachute. You can use the B6-6 in a two-stage rocket that has a B6-0 or a C6-0 in the first stage.
The long delay makes this engine suitable also for very light models that use 18 mm motors.