Can you tell me what happened my Maniac's ?
Last night I dug these out of storage.
This is the only rocket that could take an E15-6.
But one bag says Explorer and the other Challenger.

The one on the right say it will take E15's, but the parts are the same in the bags.
This has the fin can's of the ENERJET !!

Go Figure, one insert card says 1997

Later, Al

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Estes shuffles around difficulty ratings from time to time.

The Maniac is a pretty simple rocket, really. They may have inflated the difficulty to "III" at one time because it used larger motors.

You could, if you wished, use the fin can for an Enerjet clone, and put alternate fins on the body to create another model.