[burpg] Re: Fun facts update
- From: Armor Harris <armorharris@xxxxxxxxx>
- To: "burpg@xxxxxxxxxxxxx" <burpg@xxxxxxxxxxxxx>
- Date: Thu, 14 Aug 2014 12:52:19 -0700
Just a little update to the update
The motivation behind throttling is actually stability. Our trajectory sims
were showing that we were burning out too low and our dynamic pressure was
too high. Because the rocket is actually negatively stable, if we burn out
in these conditions we do a hyperflip, which is a hypersonic flip that
shreds the rocket in the upper atmosphere. Throttling down at T+30 sec
allows us to kind of ride our momentum from earlier in the flight and
burnout outside of the atmosphere.
Total burn time is 60 sec
We're not committed to building a new test stand, as we haven't ruled out
being able to make the existing one work. It's just an idea that has been
thrown out. But we do need to make that decision soon in order to support a
cold flow test in November.
On Thursday, August 14, 2014, Kelley, Andrew, Todd <atkelley@xxxxxx> wrote:
> Hey everyone,
>
>
>
> As I’m sure you’re all aware we’ve been doing an absolutely insane amount
> of work this summer on, well… everything. The Mk IIb, The Mk V,
> electronics, software, etc. I thought I’d take a moment to make sure
> everyone is aware of some of the more interesting/fun things about our
> system for the coming year:
>
>
>
> - This thing’s big… like really big. The N2O tank alone is 13.3
> ft long and 12” dia. So… yeah, big. The test stand will be 3 stories tall…
>
> - We’re throttling the rocket now! This actually improves our
> overall altitude performance by reducing the maximum drag forces we see.
> This is done by putting a small rotatable plate just after the pyro valve
> that is controlled with a servo by Kronos.
>
> - We’re burning for 70 seconds as a result. Original plan was
> like, 45 seconds. Now we’re going for a burn and a half…
>
> - Our boards are in! They’re really cool! We’ve come a LONG way
> from the stuff we were using on the Mk. III and early on the Mk. IV.
>
>
>
> -
>
> - Data… soooo much data. We have something like 81 data flows
> this year… Compared to the 12 we had the year before that, and the 4 the
> year before that. That’s a lot of data…
>
> - Software! The new software is really coming along (if I do say
> so myself), and is going to be pretty awesome. It currently supports custom
> autosequences that can be loaded with the click of a button, telemetry
> streams and graphing, and all necessary network functionality for a
> virtually unlimited number of connections to the primary data server
> (Olympus). Oh and the average CPU usage when small amounts of data are
> flowing? 0-2%... Here are a few screen shots of various windows.
>
>
> - New test stand in the works. We have some concerns about the
> old test stand’s rigidity so we’re redesigning it. It’ll basically just be
> a giant steel tower with a rocket on the side…
>
> - New GSE laptop! Armor happened to come into a Sony Viao Series
> F for all of $Free.99 that has an i7 and nVidia 640m in it. It just needs
> the OS reinstalled and we have our new, and significantly more powerful,
> GSE laptop.
>
> - And just for giggles, here’s a picture of Armor’s, Tom’s and
> my boss (Elon Musk for those of you who didn’t know) photoshopped to look
> like an 1800’s railroad/oil baron. (Note: I did not make this)
>
>
> Lemme know if you have any questions!
>
> Also, thanks everyone for all their hard work so far. This is going to be
> an absolutely unbelievable year (despite the fact that I will no longer be
> in Boston… L)
>
> -Drew
>
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