It sounds like they have mostly been lucky in never having had to use them as it doesn't sound terribly reliable. <br /><br />A question though, do other rocket designs use anything similar and what has been the failure rate on those sensors?<br /><br /> <div class="Discussion_UserSignature"> <p> </p><p><font size="2" color="#0000ff">""Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein"</font></p> </div>