They did a FOD ingestion test during Merlin dev that consisted of dropping a #10 nut into the turbopump inlet, supposedly it ate the nut and kept running fine. Haven't hear of a similar test during Raptor dev, but it would probably be good to have some FOD tolerance.
Quote from: acsawdey on 02/18/2018 02:31 pmQuote from: livingjw on 02/18/2018 12:37 pmBut they have 38 engines per BFR/BFS, all of which will be tested. During development, testing will probably include individual engine FOD and RUD containment tests as well. I think it will be done similar to turbine engine development.JohnDo you expect that they will do tests analogous to the blade-out test that is done on commercial turbofans, i.e. intentionally cause a turbopump failure to test the engine controller shutdown response and the containment system? I seem to recall hearing that spacex has already done a "nut ingestion" test.They did a FOD ingestion test during Merlin dev that consisted of dropping a #10 nut into the turbopump inlet, supposedly it ate the nut and kept running fine. Haven't hear of a similar test during Raptor dev, but it would probably be good to have some FOD tolerance.
Quote from: livingjw on 02/18/2018 12:37 pmBut they have 38 engines per BFR/BFS, all of which will be tested. During development, testing will probably include individual engine FOD and RUD containment tests as well. I think it will be done similar to turbine engine development.JohnDo you expect that they will do tests analogous to the blade-out test that is done on commercial turbofans, i.e. intentionally cause a turbopump failure to test the engine controller shutdown response and the containment system? I seem to recall hearing that spacex has already done a "nut ingestion" test.
But they have 38 engines per BFR/BFS, all of which will be tested. During development, testing will probably include individual engine FOD and RUD containment tests as well. I think it will be done similar to turbine engine development.John
Quote from: envy887 on 02/20/2018 01:35 pmThey did a FOD ingestion test during Merlin dev that consisted of dropping a #10 nut into the turbopump inlet, supposedly it ate the nut and kept running fine. Haven't hear of a similar test during Raptor dev, but it would probably be good to have some FOD tolerance.In order to be properly comparable to airliner engines, it should be able to ingest a canada goose.
Quote from: speedevil on 02/20/2018 02:10 pmIn order to be properly comparable to airliner engines, it should be able to ingest a canada goose.If you can think of a way that a canada goose can avoid hitting the top of the rocket, somehow do a 180º turn and enter the turbopump at high speeds... they test for the faults they can think of. There is no air intake in front, so the airline test makes no sense.
In order to be properly comparable to airliner engines, it should be able to ingest a canada goose.
Quote from: speedevil on 02/20/2018 02:10 pmQuote from: envy887 on 02/20/2018 01:35 pmThey did a FOD ingestion test during Merlin dev that consisted of dropping a #10 nut into the turbopump inlet, supposedly it ate the nut and kept running fine. Haven't hear of a similar test during Raptor dev, but it would probably be good to have some FOD tolerance.In order to be properly comparable to airliner engines, it should be able to ingest a canada goose.If you can think of a way that a canada goose can avoid hitting the top of the rocket, somehow do a 180º turn and enter the turbopump at high speeds... they test for the faults they can think of. There is no air intake in front, so the airline test makes no sense.
I think they should purposefully test a Raptor for hard start next to another running engine to see if they can prevent a domino effect failure like what happened on the N1.
Or if they are automatic, is anyone developing such cranes?
Quote from: Patchouli on 02/21/2018 03:33 amI think they should purposefully test a Raptor for hard start next to another running engine to see if they can prevent a domino effect failure like what happened on the N1.If they want to fly passengers P2P they will likely have to show that the engine casing contains a RUD, just like airliner engines are tested for turbine/compressor blade containment.
Quote from: Patchouli on 02/21/2018 03:33 amI think they should purposefully test a Raptor for hard start next to another running engine to see if they can prevent a domino effect failure like what happened on the N1.With FH flying, can't the N1 ghost be laid to rest? C'mon.
I can see that 'refractory glass cloth' is used in welding applications but only up to 1000 degrees C. Also, the mechanical effect of the blast force would need to be managed and it would need to be anchored.
Quote from: alang on 03/11/2018 07:47 amI can see that 'refractory glass cloth' is used in welding applications but only up to 1000 degrees C. Also, the mechanical effect of the blast force would need to be managed and it would need to be anchored. A related topic might be how rich can you operate a Raptor before it goes out.Might jet impingement at 2km/s not 4km/s be easier on the surface?If the vacuum raptors could be operated at 30% throttle very off-mixture, that may create a very different impingement pattern on the surface, at a much lower peak pressure than one sea-level raptor in the middle. (or the cluster of three)
Quote from: docmordrid on 02/21/2018 11:07 pmThere's no LAS on an airliner eitherAirliners are 10,000x safer than rockets, so adding a "LAS" would only decrease safety.
There's no LAS on an airliner either