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A comment on James Webb is fully deployed. Parent comment
Not a lot of complete, flight-capable assemblies.
I'm actually teaching a bunch of high school students to make a cubesat right now, and we are going through costing of:
* Prototypes -> protoflight -> flight, no engineering model
* "Flatsat" electronic engineering model, prototypes -> protoflight -> flight
* Prototypes -> qualification article -> flight article, + "flatsat"
* Prototypes -> qualification article -> flight article + ground engineering model
There's a whole lot of derisk that happens as you go down that list, but the cost and labor increase (the latter is "free" for us but also limited) is substantial.
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Not a lot of complete, flight-capable assemblies.
I'm actually teaching a bunch of high school students to make a cubesat right now, and we are going through costing of:
* Prototypes -> protoflight -> flight, no engineering model
* "Flatsat" electronic engineering model, prototypes -> protoflight -> flight
* Prototypes -> qualification article -> flight article, + "flatsat"
* Prototypes -> qualification article -> flight article + ground engineering model
There's a whole lot of derisk that happens as you go down that list, but the cost and labor increase (the latter is "free" for us but also limited) is substantial.