[roc-chat] Re: PET2+ OK for sustainer airstart?

  • From: David Erbas-White <derbas@xxxxxxxxxxxxxxxx>
  • To: roc-chat@xxxxxxxxxxxxx
  • Date: Sun, 13 May 2018 09:17:48 -0700

On 5/13/2018 8:56 AM, Allen Farrington wrote:

I agree with David that this discussion is exactly what this chat is for!

The idea of doing a sim and setting the logic triggers is what most staged 
rocket flyers do. It’s what I do as well.

The “if required” clause in the guidelines are there to allow for some 
discretion based on the range situation. For example, at a ROC launch, 
especially a ROCStock Saturday, we have lots of spectators and new LPR flyers 
so I would stray to the more safe configuration. If it were Friday morning when 
it’s primarily experienced flyers in a small crowd, I’d let you fly the timers, 
put it on the back row, and call it a heads-up flight.

Additionally, while your rockets are previously flown, you are trying a new ISC 
and if it fails during boost, you could light a tumbling sustainer. That’s a 
bad situation at a ROC launch, but would be OK from the away cell at black rock.

You've said it far better than I did.  I was mentally thinking of our 'normal' Saturday morning, heavily attended with numerous spectators type of launches in my response.  I agree with all of the above...

David Erbas-White


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