Poll

When will full-scale hot-fire testing of Raptor begin?

Component tests - 2017
2 (0.9%)
Component tests - 2018
10 (4.6%)
Integrated tests -  2017
13 (6%)
Integrated tests -  2018
155 (71.8%)
Integrated tests -  2019
23 (10.6%)
Raptor is not physically scaled up
11 (5.1%)
Never
2 (0.9%)

Total Members Voted: 216


Author Topic: ITS Propulsion The evolution of the SpaceX Raptor engine  (Read 174383 times)

Online livingjw

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Re: ITS Propulsion The evolution of the SpaceX Raptor engine
« Reply #740 on: 11/26/2017 12:50 PM »
I'm just saying that I have seen no evidence that the Raptor or Merlin use any type of spin up system. Does anyone know different?

Merlin uses a spin up system driven by high-pressure helium.  The actual valves used to control the flow of fuel and LOX are spring-actuated (built into the pintle in the case of the combustion chamber, not sure about the preburner but presumably it has something similar?), so in order for fuel to even be injected the pressure must be high enough, which requires first spinning up the turbopump somehow.
Thank you.

John

Offline spacenut

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Re: ITS Propulsion The evolution of the SpaceX Raptor engine
« Reply #741 on: 12/08/2017 03:15 AM »
Any new information from SpaceX on Raptor development? 

Offline DJPledger

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Re: ITS Propulsion The evolution of the SpaceX Raptor engine
« Reply #742 on: 12/14/2017 09:54 AM »
Any new information from SpaceX on Raptor development? 
Not heard anything. Perhaps you should not expect any more new info. on Raptor dev. until IAC2018 knowing SpaceX.

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