We use these with the Estes Pro-Series II kits (Argent, Partizon, Ventris and Sahara) and they are perfect for deployment right at apogee with the six second delay. 1400-1500 feet. Nice quick burn.....

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 ....

These work much better than the copperheads, make sure they are touching the grain and held in well so that they don't spit out the nozzle. A little 4F can help ensure ignition....