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Old 12-21-2013, 01:20 AM
Rex R Rex R is offline
Craftsman
 
Join Date: Feb 2011
Posts: 473
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the stated delay times are measured from motor (propellant) burn out, just like the Estes motors you're used to. yes the delay starts burning at motor ignition But, that has been allowed for by the motor maker, all you have to worry about is the coast time.
yes the F24 has a lower thrust but it has a longer burn (as denoted by the difference in total Newtons 50 vs 40) the Estes E9 has a lower thrust than the D12. running flight simulations in 'Open Rocket' helps a lot in finding the 'right' motor. The hand book of model rocketry has a nice chapter on rocket motors and what all those numbers mean.
Rex
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