I read somewhere that people use a switch to short out an e-match and just before launch they open the switch so the ejection charge can be activitated by the altimeter. But doesn't this make the altimeter continuity check useless? It will show continuity with the switch in either position so it would be possible to launch the rocket with the ejection charges still shorted. Wiring the switch in series with the e-match and altimeter would eliminate this problem. Then the altimeter would only detect continuity if the switch was closed and so there could be no false continuity signal. I realize this would not prevent the e-match from being set off by static electricity, etc., but I've never heard that static is a real problem for HPR fliers. Any thoughts on this? Larry Lobdell Jr.
- posted
17 years ago