Omega_D
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- Joined
- Dec 31, 2003
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I'm recently back into HPR after about a 5 year hiatus. I built a scratch 3" upscale of an Estes Delta Clipper rocket with 38mm motor mounts in the booster and sustainer. I planned on certifying with the sustainer only on an I211. I had some old I211s from 5 years ago, still sealed in the package and stored appropriately.
On launch day, I was reminded that lighting old WL motors may be difficult so I used a good dipped igniter (Magnelite or Rocketflite? I can't remember). The rocket chuffed twice on the pad before launch (a nice straight flight too). This threw off the altimeter launch detect algorithm which resulted in no deployment and subsequent lawn dart destroying the bird and altimeter. Luckily I didn't have time to paint it!
I've heard of a couple of ways to prevent motor chuff but of course I can only remember one. I seem to remember that I read that coating the core of the forward grain in a reload with ignighter pyrogen will help igniting those old motors.
Does this sound right or are there other ways to do it? I have a couple more old WL and BT Aerotech loads that I'd like to use but I don't want to see another lawn dart. I think I'm going to use motor ejection back up or perhaps timer backup on the rebuild.
Any suggestions?
Thanks in advance.
PS - For all of you guys that like pictures, here's the landing...
On launch day, I was reminded that lighting old WL motors may be difficult so I used a good dipped igniter (Magnelite or Rocketflite? I can't remember). The rocket chuffed twice on the pad before launch (a nice straight flight too). This threw off the altimeter launch detect algorithm which resulted in no deployment and subsequent lawn dart destroying the bird and altimeter. Luckily I didn't have time to paint it!
I've heard of a couple of ways to prevent motor chuff but of course I can only remember one. I seem to remember that I read that coating the core of the forward grain in a reload with ignighter pyrogen will help igniting those old motors.
Does this sound right or are there other ways to do it? I have a couple more old WL and BT Aerotech loads that I'd like to use but I don't want to see another lawn dart. I think I'm going to use motor ejection back up or perhaps timer backup on the rebuild.
Any suggestions?
Thanks in advance.
PS - For all of you guys that like pictures, here's the landing...