[ARTS] ARTS2 descent rate calculation

[Kevin Rezac - CCV Software]

It could have even been something unusual like catching some hang time
in a thermal above the altitude at which the main should have fired
causing a longer than normal time from drogue to main deployment. It's
hard to guess without actually seeing the descent altitude graph. I have
seen rockets go up while on descent when caught in a thermal. 

 

Kevin Rezac

 

From: arts-bounces at lokiresearch.com
[mailto:arts-bounces at lokiresearch.com] On Behalf Of James Dougherty
Sent: Tuesday, April 22, 2008 4:09 PM
To: Jeff Taylor
Cc: arts at lokiresearch.com
Subject: Re: [ARTS] ARTS2 descent rate calculation

 

Thanks Jeff,

 

Got it. Yes, they are pretty close.

Just wanted to check.

 

-James



 

On 4/22/08, Jeff Taylor <jeff at lokiresearch.com> wrote: 

James Dougherty wrote:
> Hi,
>
> I'm wondering if someone can explain why the ARTS2 shows a lower
> descent rate for
> the drogue then the main. In all of these flights, the main and drogue
> have deployed
> at apogee (not enough shear pins, or wrong size), so I would (if
> anything) expect them
> to read the same.
>
>
> Thanks,
> -James
>
Well, I would say that they do read the same, I mean 21ft/sec vs 23
ft/sec?  That's pretty darn close.

I might be able to offer more insight if I saw the actual flight data,
but there probably isn't much to see.

These aren't complicated calculations, all the program does is this:
(altitude at apogee - altitude at main event) / (time at main event -
time at apogee)
and (altitude at main event ) / (time at touchdown - time at main
event).  You will see a "Can't calc" if you run out of memory before one
of the events happens.

-Jeff


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