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KSP got it RIGHT.... amazingly so...

kiwi1960

By kiwi1960
in Science & Spaceflight

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K^2

K^2

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OK, quick comment here. First off, POGO vibration exists in *all* rockets, be they liquid- or solid-fueled.

POGO is due to changes in fuel flow. Solid motor is immune to that by definition. Increase in combustion pressure in solid motor leads to an increase of the burn rate, not a decrease as on the liquid motor.

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Nibb31

Nibb31

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POGO is due to changes in fuel flow. Solid motor is immune to that by definition. Increase in combustion pressure in solid motor leads to an increase of the burn rate, not a decrease as on the liquid motor.

Actually, one of the big problems with Ares-I was thrust oscillation in the SRB first stage, which is akin to pogo although with a different cause. It was more of a resonance vibration effect, but it required lots of heavy acoustic dampening that hurt the performance of the rocket.

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K^2

K^2

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I'm not saying an SRB thrust can't oscillate, but it's not POGO. Resonances in SRB are more similar to how a whistle works. You can get these in liquid fuel engines as well. These tend to be higher frequency, which makes them less dangerous to the general structure of the rocket, but much more dangerous to the engine itself.

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