aksarben10
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- Apr 23, 2003
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Just wondering if anyone has had any issues using the PET2 timer with the G-switch launch detection in high drag rockets.
I bought a brand new timer for use in a pyramid rocket. Since I planned on using the lift of detection of the G-switch I decided to ground test the timer and it worked fine. I had built a nice electronics bay for it and loaded it up set for 4 sec's. Flew the rocket on an I motor, plenty of thrust certainly more then my arm swing used on the ground test.
I failed to fire and was still beeping when I got to the rocket. Luckily this rocket was build with ballistic recovery in mind. We checked the timer and reset it and flew it again, this time it passed overhead in an arc, when passing over several people reported hearing the fast beeps meaning it had armed. Still not ejection and when I got to the rocket it was back to the slow beeping which is just the all ready beep.
So, we tried another PET2 timer again the same thing, up down no ejection.
I wrote to Missile Works. My theory is that the high drag rocket causes the timer to disarm on when it decelerates. He thinks this cannot happen and claims once it arms, indicated by fast beeping, it cannot disarm. He then focused on the fact that we could hear a small piezo beeper.
So this last weekend a friend of mine who was familiar with this issue decided to test his PET2 timer, which he has flown over 30 times without problem, in a high drag rocket. He used a sort of spool rocket and flew yet a third timer in a different rocket, same thing no ejection. He did it again using pull pin and it worked fine.
In case you forgot my question after my story. Has anyone else had any issues with PET2 timers using G-switch in high drag rockets?
Scott
I bought a brand new timer for use in a pyramid rocket. Since I planned on using the lift of detection of the G-switch I decided to ground test the timer and it worked fine. I had built a nice electronics bay for it and loaded it up set for 4 sec's. Flew the rocket on an I motor, plenty of thrust certainly more then my arm swing used on the ground test.
I failed to fire and was still beeping when I got to the rocket. Luckily this rocket was build with ballistic recovery in mind. We checked the timer and reset it and flew it again, this time it passed overhead in an arc, when passing over several people reported hearing the fast beeps meaning it had armed. Still not ejection and when I got to the rocket it was back to the slow beeping which is just the all ready beep.
So, we tried another PET2 timer again the same thing, up down no ejection.
I wrote to Missile Works. My theory is that the high drag rocket causes the timer to disarm on when it decelerates. He thinks this cannot happen and claims once it arms, indicated by fast beeping, it cannot disarm. He then focused on the fact that we could hear a small piezo beeper.
So this last weekend a friend of mine who was familiar with this issue decided to test his PET2 timer, which he has flown over 30 times without problem, in a high drag rocket. He used a sort of spool rocket and flew yet a third timer in a different rocket, same thing no ejection. He did it again using pull pin and it worked fine.
In case you forgot my question after my story. Has anyone else had any issues with PET2 timers using G-switch in high drag rockets?
Scott