[Lorin]

Is "3U" the satellite's dimensions as if it's electronic rack equipment? hah.

[d_silin]

Ah no, cubesats use a different definition of "1U" which is a 10x10x10 cm cube (1L volume). So a 3U satelitte will be 30x10x10 cm box with a 3L volume and mass around 4-5kg