‘Where are my engines, Jeff?’ Ars investigates Blue Origin BE-4 engine delay for ULA Vulcan rocket

You don’t have to spend much time on Space Twitter or Reddit to stumble upon a few dozen “Where are my engines, Jeff?” memes. Ars Technica recently took a shot at finding the answer to why Blue Origin’s BE-4 engines are delayed.

Elon Musk taunts ULA and Blue Origin after rogue plane and regulation delay SpaceX rocket launch

So this happened today. SpaceX CEO Elon Musk responded to a Vulcan rocket teaser video from ULA CEO Tory Bruno with a slightly provocative “when do the engines arrive” response. Without mentioning Blue Origin, the taunt is mostly targeted at Jeff Bezos’ rocket company.

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ULA’s maiden Vulcan flight delayed to 2022 due to payload readiness

We’ve all been waiting on the debut of United Launch Alliance’s brand new Vulcan rocket, the rightful successor to the Atlas V and Delta IV. But we might have to wait a little long for a payload to be ready to fly on the first mission.

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Vulcan rocket pushes forward as Blue Origin’s BE4 ‘Path Finder’ engines reach Decatur

While Blue Origin and ULA are competitors who will be launching payloads into space, they have been partners in the development of a new engine used to power both of their newest rockets.