Estes Leviathan/AT G71R-7 failure

[pyrobob]

I've been testing a theory I have about 'bonus' delays...with only 5 'tests' I can't say conclusively that it works. theory: bonus delays are caused by the delay element not igniting at engine start due to oxidation of the delay surface. so I have been giving my delays a few swipes with 60 grit sandpaper. so far no bonus delay. I note that the starters do not touch the delays in 24mm 1grain Ds & Es and 29mm Es & Fs(AT) as one is supposed to tape the top of the propellant (the tape gets burned through Very quickly with even just a chuff).
Rex

Interesting thought, and thanks for sharing.