Submitted by astro_pettit t3_12241ym in space
ZealousidealClub4119 t1_jdp61l4 wrote
Fun fact about the cupola: there are shutters on the outside that are manually operated by little wheels, with connecting rods going through the pressure hull. Needless to say the seals around these rods have to be very good.
How much force is needed to operate the shutters please?
Thanks for sharing :-)
beastpilot t1_jdpsfkz wrote
15psi is a very small pressure difference and is trivial to seal against. The oil pressure in a car is 5x that and the seals involved deal with way more rotations over their lives.
ZealousidealClub4119 t1_jdpt6xx wrote
15 psi? That's all? I did not know that.
beastpilot t1_jdptbdr wrote
Space is zero psi Earth is 14.7 psi at sea level That is all there is. The difference is 15psi.
ZealousidealClub4119 t1_jdpu6jo wrote
Well I've made myself look like an idiot then.
bluenoser613 t1_jdql1ie wrote
No not at all. Most don't think about this. Even diving 10m in the water is 2x more pressure than this. Someone going to the bottom of the ocean is way harder for the vehicle to withstand.
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