We use these on several of the Estes kits with weights ranging from 3.2 Oz up to 5 Oz. They really get off the pad in a hurry and many folks at launches ask what motor was used and where they can get them.
A 6-second delay option from Aerotech would allow greater versatility as the 8 second is really only good for light rockets and the 4-second is too short for most kits with a 24mm mount.
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