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I do quite firmly believe that when a project is simple enough that one person is capable of writing it, it should be written by one person. Many projects do eventually get beyond that point, but it is good strategy to try and stay in the one-man-software-development range.
Flight control software, even for orbital vehicles, should certainly be in that range.
A second (or third...) pair of eyes to CHECK the code is a good thing, but having two or three people write code that could have been written by one person is a bad thing. It really didn't take all that much time for me to write all of the software we use.
John Carmack
We are intending to fly the tube vehicle untethered on Friday in Oklahoma. With five gallons of peroxide, it should only reach somewhere around 1200' altitude, but that will get us a lot of data. The takeoff weight will be 350 pounds, and the acceleration will be under 1G, so this will look very different than an HPR launch. The vehicle tank is 60 gallons, but the current engine would only have positive lift with 15 gallons of peroxide. The next vehicle will use the same size tank, but will be more streamlined, and will have four 5.5" engines, allowing it to go supersonic.