<div dir="ltr">Mike:<div><br></div><div>I would be glad to help. While you may not wish to exercise the capability at Kentland, it would be fun to use OpenRocket or Rocksim to determine the optimum delay after first stage burnout to start the second stage to maximize altitude. Then, if you ever fly at a large field, you could delay second stage ignition to maximize altitude.</div><div><br></div><div>Are you planning to recover the second stage with just the delay charge or using electronics? How will you recover the first stage?</div><div><br></div><div>I have a few Olsen timers (fruit of the 1990s) in stock that can be activated by acceleration if you do not have a timer available. No loss if they do not come back.</div><div><br></div><div>Pat</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 3, 2021 at 9:10 AM Michael Czernicki via NRVR-Members <<a href="mailto:nrvr-members@server2.nrvr.org">nrvr-members@server2.nrvr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><br><br>---------- Forwarded message ----------<br>From: Michael Czernicki <<a href="mailto:mikebpd221@yahoo.com" target="_blank">mikebpd221@yahoo.com</a>><br>To: <a href="mailto:nrvr-members@server2.nrvr.org" target="_blank">nrvr-members@server2.nrvr.org</a><br>Cc: <br>Bcc: <br>Date: Wed, 3 Mar 2021 09:10:03 -0500<br>Subject: Input requested on two stage build project<br>I’m working on a two stage project and have run into a question I wanted to get some feedback on while I’m still in the conceptual phase. Does our group have a safety protocol on sustainer ignition in two stage rockets? Electronics in the budget range I have can do either a timed ignition with inhibition based on orientation axis or minimum altitude/velocity. The build scope is a 2.2” airframe, not exceeding 2000g so there’s not a ton of room to build in. I’m planning on keeping the flight profile under 3000’ altitude with H to F motors. Anything bigger risks outflying the field. <br>
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Forum opinions on this question are pretty wide but seem more directed at mitigating failures in much larger rockets than what I’m proposing. Closer to home input seems like a better idea than “the internet said so”. <br>
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I appreciate the feedback and I’m more than willing to bring plans and pieces to the next event if that helps. Look forward to flying soon. <br>
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Mike Czernicki <br>
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Sent from my iPhone<br>
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<br><br><br>---------- Forwarded message ----------<br>From: Michael Czernicki via NRVR-Members <<a href="mailto:nrvr-members@server2.nrvr.org" target="_blank">nrvr-members@server2.nrvr.org</a>><br>To: <a href="mailto:nrvr-members@server2.nrvr.org" target="_blank">nrvr-members@server2.nrvr.org</a><br>Cc: <br>Bcc: <br>Date: Wed, 3 Mar 2021 08:10:10 -0600<br>Subject: [NRVR-Members] Input requested on two stage build project<br>_______________________________________________<br>
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