AIRFIX VOSTOK ROCKET PART 2 - IS WHITE RIGHT?
Airfix Vostok launchers built up, with empty tanks (left) and full ones (right). Mat Irvine solves a question of colour Last time (article here ) I pointed out that whatever colour Vostok space launchers really were, they were not white. However photos have often made them appear partially white, so what was going on? Super-cold liquid The truth is that the ‘white’ in published pictures was correct, but it was not paint - instead, it was actually frost. This is because Vostok’s rocket motors used cryogenic fuels, or to be totally accurate, a cryogenic oxidizer in the form of LOX, or liquid oxygen (the ‘fuel’ was the far more mundane liquid kerosene). LOX is cold - very cold** - and once the rocket is fuelled, it chills water vapour in the atmosphere immediately outside the tanks, and ice forms on the metal skin - which of course shows up white! A real Vostok, almost certainly Yuri Gagarin’s Vostok 1. Note the icing. Other rockets too The same was true for the US Saturn rockets. The fir...