Correct on the -0 motors for the booster stage...

Motors for the sustainer (upper) stage(s) will sometimes have longer delays, like the C6-7, D12-7, etc... the longer delay gives a longer coast time after upper stage motor burnout for the rocket to gain maximum altitude and slow down from the high acceleration after staging during its coast to apogee...

With a kit, it's best to stick to the recommended motors until you know how it flies under your conditions... better to fly it on the smallest recommended motors to make sure you don't lose it, because stagers DO go a lot higher and faster than you think they will... once you get a "feel" for how the rocket will fly, you can always move up to larger recommended motors...

Later! OL JR

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