| General > General Technical Chat |
| Starship is now Stacked |
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| pqass:
--- Quote from: Gyro on August 08, 2021, 08:01:52 pm --- --- Quote from: rdl on August 08, 2021, 07:38:08 pm ---Rockets do not sit on the engine bells. There is a structure at the base for this purpose and there are hold down clamps attached to keep everything steady. The engines hang from this structure. At launch when the engines ignite, the hold down clamps keep the vehicle in place until the system is confirmed to be working correctly. Only then is it released. --- End quote --- It would be kind of difficult to get them to light if they did! ;) You could certainly say that the rocket is sitting on the engines when in flight though. --- End quote --- The gimbal mount looks to be the size of a hardhat sitting directly on top of the combustion chamber. See attached F1 and Raptor engines close-up. When the business-end is lit, 690 (F1), 230 (Raptor) tonnes of force pushes up on this one point! (images from Wikipedia) |
| Gyro:
--- Quote from: mrflibble on August 08, 2021, 09:41:06 pm --- --- Quote from: Gyro on August 08, 2021, 08:17:08 pm ---Have they done a test firing with all 29 engines running yet? I think I would have remembered that one. Maybe it's the sort of test that you can only do in the air! --- End quote --- Nope, not yet. Of the 29 engines currently fitted, 5 have not been subjected to a test firing at all. Booster 4 is expected to be moved back to production site for additional work, somewhere during the coming week. Until those 29 engines perform their simultaneously controlled explosions, here's some Saturn V static firing instead: https://youtu.be/-rP6k18DVdg?t=183 --- End quote --- That's a great video. If anything, that giant blowlamp is more impressive than watching it disappear into the sky (apart from maybe clearing the tower). The noise level must have been beyond imagining! :scared: |
| rdl:
This one has a close view of the F-1 engines on the Saturn V at launch https://youtu.be/DKtVpvzUF1Y |
| David Hess:
--- Quote from: pqass on August 08, 2021, 09:46:49 pm ---The gimbal mount looks to be the size of a hardhat sitting directly on top of the combustion chamber. See attached F1 and Raptor engines close-up. When the business-end is lit, 690 (F1), 230 (Raptor) tonnes of force pushes up on this one point! --- End quote --- That makes the pressure in compression about 2500 pounds per square inch which is hardly anything. The structure attaching the mounts (engine bus?) is in bending and has much greater requirements. |
| GlennSprigg:
Relatively short Interplanetary flights aside... I've always wondered about the almost 'fruitfulness' of initial/future attempts at Stellar travel, as 10 or 20 years later, newer & fancier machines will overtake them mid-flight!! 8) |
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