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Why isn't LOX/UDMH is not used in staged combustion rockets now-a-days? If there are any rockets with LOX/UDMH kindly mention them

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more (if there are any kindly mention) although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundentlyabundantly.

If there are any rockets with LOX/UDMH kindly mention them.

Why LOX/UDMH is not used in staged combustion rockets now-a-days? If there are any rockets with LOX/UDMH kindly mention them

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more (if there are any kindly mention) although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundently.

Why isn't LOX/UDMH used in staged combustion rockets now-a-days?

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundantly.

If there are any rockets with LOX/UDMH kindly mention them.

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Why LOX/UDMH is not used in staged combustion rockets now-a-days? If there are any rockets with LOX/UDMH kindly mention them

Liquid rockets usually use a propellant pair of fuel and oxidizer. I've seen some rockets from 1960's that used LOX/UDMH as propellant pair but why they are not used any more (if there are any kindly mention) although it is mentioned that LOX/UDMH has higher performance than N2O4/UDMH but N2O4/ UDMH is used abundently.