rcktnut
Well-Known Member
Do you have the bulkhead yet? If so slice it length wise, with hacksaw, dremel maybe you will find something out. If you don't want to, send it to me, I'll pay postage. I'd like to see how they look on the inside.
Kevin - Thanks for the reply. I don't know the details about the internal construction of these DMS motors. I did drill out 3/16", or 6 sec worth of the delay, to get an 8-sec delay. I followed the instructions carefully so the result was very unnerving and has me questioning whether to use DMS motors again. Whether this was blow-by or an uneven burn rate of the delay, I don't know.
Yes, I'm thinking about going back to RMS motors and no more DMS ones.
Thrust rings that detach, cases that rupture, and delays that blow several seconds early. Can't wait to fly DMS!
Because the other brand is perfect too? Having sold both, I've had very few failures from dms. All of these issues have been resolved, though they were not super common anyway.
Tom,
I suggest you contact Aerotech (Karl) and give them the serial numbers of your two I140 DMS motors. They (he) will be able to tell you if they are the newer version in which they claim to have solved the delay element problem. If not, they may well offer to send you replacements. My old I140, which I bought in March, did exactly what happened to you (ejection 2 sec after burnout even though I drilled it to 8 sec). However, the replacement I140 that Aerotech sent me in May performed normally.
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