# Re: [PSAS] staging designs, code inspection

```Total terminology gaffe on my part! "stage seed" refers to the weight
of the stage above the stage for which we desire fuel numbers. Eg, for
stage three, the seed should be 1kg, the payload weight. For stage 2,
the seed should be 4 kg and some change (stage three's wet weight, you
see!).```
```
the stage velocities are as calculated on lines seven and eight of the
section titled 'iterative approach'.

I'll clear those details up as soon as I return to a computer!

On 1/29/11, rq1...@q7.com <rq1...@q7.com> wrote:
> Hey,
>
> Looks good!
>
> I can't check the iterative output 'cuz the stage speed ("Stage Seed")
> is missing from the table. (Or i don't understand it, or my browser
> isn't rendering it, etc.) But if the stage speed was known you could
> just use the first equation as a simple check.
>
> --
> We should (do?) have a symbols page to define the meaning of these
> symbols, and/or define them as they are used.
>
>> http://psas.pdx.edu/staging/
> --
>   http://psas.pdx.edu/news/2000-11-02/RA_PSAS_Lecture.PPT
>   http://psas.pdx.edu/RocketSim/
>   http://psas.pdx.edu/2012_liquid_motor_notes/
>   http://psas.pdx.edu/simplerockets_1d/
>   http://psas.pdx.edu/RocketSimPhysics/
>
> (2011.01.29) ben...@gmail.com:
>> I was curious to see what it would take to get a 1 kg payload into orbit,
>> so
>> I did some math and wrote some code! Forgive me if this duplicates work
>> elsewhere on the wiki, but in lieu of a page on "Staging", I created my
>> own
>> and populated it to some degree.
>>
>> Please, kick tires and poke holes! I wrote a small bit of code with the
>> intention to calculate and iterate fuel needs. I have no idea if it
>> works,
>> but simple delta-vee calculations on its outputs are encouraging.
>
>
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```