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eh_why_not | 10 months ago

https://en.wikipedia.org/wiki/Kosmos_482

> Its landing module, which weighs 495 kilograms (1,091 lb), is highly likely to reach the surface of Earth in one piece as it was designed to withstand 300 G's of acceleration and 100 atmospheres of pressure.

Awesome! I don't know how you can design for 300 G's of acceleration!

discuss

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WJW|10 months ago

Overbuild everything. For things that might be fragile-ish like surface mounted electronics, cast the whole thing in resin. As a sibling poster has mentioned, we shoot things out of artillery tubes these days that have way harsher accelerations than 300g.

MarkMarine|10 months ago

300g is nuts. Electronics in a shell is one thing, this is a landing craft. In a prior life my designs had to survive 12g aerial drop loads and we had to make things pretty robust.

numpad0|10 months ago

Gun scopes are minimum 500G rated. Apparently that's the ballpark for recoils(the reaction force from the barrel becoming a rocket engine, and/or the bolt/carrier bottoming out)

os2warpman|10 months ago

There are electronics and gyroscopes designed for >9,000 G loads, in guided artillery shells.

Aerospace is awesome.

nandomrumber|10 months ago

88.2 m/s^2

For well under a second though, typically artillery muzzle velocity is, what, two to three thousand feet a second?

Still, it’s wild that guidance electronics and control mechanisms can survive that sort of acceleration.

dgrin91|10 months ago

Nitpicking, but wouldn't it be 300 Gs of deceleration? I know the math is basically the same, but technically the words a mean different things

crazydoggers|10 months ago

Acceleration is a vector. So if you apply the “deceleration” long enough you’ll eventually be accelerating in the opposite direction. Without a frame of reference it’s all the same. Even with a frame of reference you’re still accelerating just that it’s in he opposite direction of the current velocity.

amoshebb|10 months ago

I think this is a case where “technically” the words mean the same thing but “generally” they mean different things.

Rover222|10 months ago

This is wrong when talking about the physics of something. Deceleration is acceleration. Acceleration is just a change in velocity.

anyfoo|10 months ago

Acceleration, deceleration, point is: Something is going to apply 300 gs in a certain direction to design for.

It's not like you can tell whether you're going slow or fast, in one direction, the other direction, or even just standing still, if you close your eyes.

drob518|10 months ago

It’s just a minus sign.

jbnorth|10 months ago

What is deceleration but acceleration in the opposite direction? /s

exabrial|10 months ago

Flip your phone upside brah