REPLY TO ALL SHOULD BE DEFAULT SETTING.

---------- Forwarded message ----------
From: Benjamin Kaplin <bkap...@pdx.edu>
Date: Mon, 31 Jan 2011 12:11:40 -0800
Subject: Re: [PSAS] staging designs, code inspection
To: David Harris <dharris...@gmail.com>

the code is aero model independent: plug in stages and delta v for
each stage, isp and fif, and it spits back masses. Aero modeling
should inform delta v apportioning.

delta v for leo is like 7500 (?) m/s, so there's a fat ol' margin in
those examples. I'd like to discuss aero modeling at the next meeting
(what it gets us, what we can engineer around, extreme values, max q
and whatnot.

On 1/31/11, David Harris <dharris...@gmail.com> wrote:
> Hi Ben,
>
> What aero model are you using and how are you calculating the gravity turn
> and angle of attack losses?
>
> Or at this point are you just adding some margin to the delta v target
> figure and just approximating?
>
> David
>
> On Sun, Jan 30, 2011 at 6:03 PM, Benjamin Kaplin <bkap...@pdx.edu> wrote:
>
>>
>> Ex:
>>> - m_i1  Mass of 1st stage only, including fuel
>>> - m_f2  Mass of 2nd stage only, excluding fuel
>>>
>>>
>> This comment pointed out to me that the script was really only useful for
>> designing a particular stage. So, to provide a more general tool, I
>> rewrote
>> the script. It should be a lot more user-friendly now. It allows for cool
>> things like specifying the supportmass/fuelmass ratio on a per-stage
>> basis.
>> Enjoy!
>>
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