My understanding of the 3U cubesats that these are intended to be used on was that they weren't much bigger than a 2 litre bottle. Am I way off in my understanding, or do these just use most of the available volume?
Ah didn't realise the dimensions were quite that small! That does mean that this takes up 2/3rds of the cubesat, which sounds like it would be impractical for many purposes.
This one flew on a 6U (~35x20x10) and that's really the minimum size for this kind of engines. And even on a 6U, the power limitations make us think twice before putting an engine, it really has to be needed.
