Shortening delay on AT Economax and G80 motors?

[billdz]

Is there any reason why we can't use the AT delay drilling tool to shorten the delay time on some Economax G74-9W motors and a G80-10T?

 

[tim cubbedge]

Is there any reason why we can't use the AT delay drilling tool to shorten the delay time on some Economax G74-9W motors and a G80-10T?

You can do it but if I'm not mistaken it becomes an EX motor and must fly by Tripoli rules.

 

[jimzcatz]

Wrong!!!!! Adjusting delays are NOT modifying motors. The manufacturers say you can do it. 1/32nd inch equals 1 second.

 

[rharshberger]

Wrong!!!!! Adjusting delays are NOT modifying motors. The manufacturers say you can do it. 1/32nd inch equals 1 second.

Jim, are Economax SU motors designed in such a way as to be able to modify their delays, in like the DMS motors with their much larger holes between the delay and the charge?

Sent from my SM-N920V using Rocketry Forum mobile app

 

[rcktnut]

Jim, are Economax SU motors designed in such a way as to be able to modify their delays, in like the DMS motors with their much larger holes between the delay and the charge?

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The touch holes are smaller than the DMS, if using a normal size drill ( the dia. of DMS ) you would be drilling into the bulkhead first. The single use instructions also include wording not to alter the motor in any way.

 

[dhbarr]

EX / comm discussion notwithstanding, do -not- go below 4sec. Your fire will come out the wrong end.