broofa
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- May 3, 2015
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Question: If delay times are given as "time from motor burnout", but delay grains start burning at ignition for core-burning motors like Aerotech's RMS line of motors, how is it possible for Aerotech to have standard size delay grains that work across motors with a wide range of burn times?
For example, let's say the standard "L" delay grain from Aerotech has an *actual* burn time of 17 seconds (from ignition). Put that in a J520W motor (1.3 second burn time) and you have a delay time of 15.7 seconds. But put that in a J90W motor (7 second burn time) and you have a delay of 10 seconds.
In theory, that's a pretty considerable variation in delay times... certainly enough that you'd want to account for it when setting your motor delay.
I know this is complicated by other factors, too. For example, I saw a mention that delay grains burn considerably faster when a motor is at pressure than after motor burnout. But it's unclear whether that would temper or exacerbate this issue. E.g. Would a long-burning motor burn the delay grain faster for a longer period of time, leading to an even shorter delay time after burnout?
Anyhow, 'would love to get some insight into how to properly account for this seeming incongruity.
For example, let's say the standard "L" delay grain from Aerotech has an *actual* burn time of 17 seconds (from ignition). Put that in a J520W motor (1.3 second burn time) and you have a delay time of 15.7 seconds. But put that in a J90W motor (7 second burn time) and you have a delay of 10 seconds.
In theory, that's a pretty considerable variation in delay times... certainly enough that you'd want to account for it when setting your motor delay.
I know this is complicated by other factors, too. For example, I saw a mention that delay grains burn considerably faster when a motor is at pressure than after motor burnout. But it's unclear whether that would temper or exacerbate this issue. E.g. Would a long-burning motor burn the delay grain faster for a longer period of time, leading to an even shorter delay time after burnout?
Anyhow, 'would love to get some insight into how to properly account for this seeming incongruity.