[NRVR-Members] Input requested on two stage build project

Pat Artis pat.artis at gmail.com
Wed Mar 3 09:35:26 CST 2021


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.

Are you planning to recover the second stage with just the delay charge or
using electronics? How will you recover the first stage?

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.


On Wed, Mar 3, 2021 at 9:10 AM Michael Czernicki via NRVR-Members <
nrvr-members at server2.nrvr.org> wrote:

> ---------- Forwarded message ----------
> From: Michael Czernicki <mikebpd221 at yahoo.com>
> To: nrvr-members at server2.nrvr.org
> Cc:
> Bcc:
> Date: Wed, 3 Mar 2021 09:10:03 -0500
> Subject: Input requested on two stage build project
> 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.
> 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”.
> 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.
> Mike Czernicki
> Sent from my iPhone
> ---------- Forwarded message ----------
> From: Michael Czernicki via NRVR-Members <nrvr-members at server2.nrvr.org>
> To: nrvr-members at server2.nrvr.org
> Cc:
> Bcc:
> Date: Wed, 3 Mar 2021 08:10:10 -0600
> Subject: [NRVR-Members] Input requested on two stage build project
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