DaveHein
Well-Known Member
- Joined
- Feb 19, 2009
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I am trying to make sense out the Aerotech ejection delays. I need a delay of 12.6 seconds for a G64 motor. I plan on ordering an HDK-22 delay, which is the 0.75 inch delay element. Based on the specs for the 4, 7 and 10 second delay elements, the HDK-22 will give a 16.6 second delay. So my plan is to shave off 4 seconds, or maybe 3 seconds so that it ejects after apogee.
I have used the rule of thumb of 1/32nd of an inch per second when making delay adjustments in the past. However, after looking at the various delays in the HDK table it seems that 1/32nd inch would be too much for the G64. My computations show that the G64 delay burns at a rate of about 0.018 inches per second. I also looked at the F40, which burns at a rate of 0.044 inches per second, which is almost 2.5 times the G64 rate. Has anybody else looked at the delay burn rates for the various motors? Do my numbers make sense?
I understand that the delay element burns quite a bit faster when the motor is under pressure, but why would there be a difference in burn rate after the motor has burned out?
Dave
I have used the rule of thumb of 1/32nd of an inch per second when making delay adjustments in the past. However, after looking at the various delays in the HDK table it seems that 1/32nd inch would be too much for the G64. My computations show that the G64 delay burns at a rate of about 0.018 inches per second. I also looked at the F40, which burns at a rate of 0.044 inches per second, which is almost 2.5 times the G64 rate. Has anybody else looked at the delay burn rates for the various motors? Do my numbers make sense?
I understand that the delay element burns quite a bit faster when the motor is under pressure, but why would there be a difference in burn rate after the motor has burned out?
Dave