Author Topic: Blue Origin's BE-7 engine  (Read 74906 times)

Offline AS-503

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Re: Blue Origin's BE-7 engine
« Reply #120 on: 06/02/2023 02:43 am »
Agree with meekGee.
The F1 had a traditional gimbal on the top of the thrust chamber.
Another clue is that the photos clearly show the struts that are actuated by the hydraulic ram are connected to the thrust chamber NOT the nozzle.
It it was a nozzle gimbaled design the struts would be on the nozzle.

Offline sevenperforce

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Re: Blue Origin's BE-7 engine
« Reply #121 on: 06/02/2023 03:51 am »
I feel like the load paths for a virtual gimbal about the nozzle throat would be hella challenging. You're talking about truly immense forces and the natural geometry of the engine already directs those forces up the nozzle and into the combustion chamber axially. Trying to transfer a load into gimbals mounted anywhere other than the chamber...yikes.

Offline edzieba

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Re: Blue Origin's BE-7 engine
« Reply #122 on: 06/02/2023 09:49 am »
The disadvantage of course is that the throat now has to have the ability to flex.
The diagram is misleading: there is no flex at the throat, the engine gimbals about an axis within the throat, but that just means the powerhead swings about the pivot in the opposite direction to the nozzle. The main impact of this is clearance within the engine bay, and that instead of one propellant feed line translating and rotating and one just rotating (assuming it is routed through a topend gimbal) both feed lines translate and rotate. This is not uncommon for vernier engines (e.g. Atlas, Thor, Soyuz).

Tags: be-7 Blue Origin 

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