South Africa after 1977 was fully metric only, so this is the measument system environment in which Elon Musk grew up. He left South Africa in 1988. The default "ton" definition to someone who used only metric and very little English measurments would be the metric ton.http://ukma.org.uk/south-african-experienceSo the interpretation of metric ton for this tweet has a foundation.
Except there isn't such a thing as a "metric ton" of force, just a metric tonne of mass (1000 kg precisely). Force/mass confusion is a common deficiency of American engineers...
Quote from: iamlucky13 on 10/02/2012 11:48 pmQuote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.This is a totally random uneducated guess, but would the ring make sense as a mounting point for a retractable nozzle?
Quote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.
Copied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQ
First picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQ
Elon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQ
Quote from: simonbp on 10/04/2012 12:47 amExcept there isn't such a thing as a "metric ton" of force, just a metric tonne of mass (1000 kg precisely). Force/mass confusion is a common deficiency of American engineers...It's not a confusion, it's shorthand.. and it's not just American engineers.
While we're making uneducated guesses, I bet they chose to dump the turbo pump exhaust into the main nozzle in order to make it sleek enough to be retractable. I don't see an exhaust nozzle in spacex's reusability video nor do I see where they would put one: http://spacex.com/multimedia/videos.php?id=2
Don't read too much into the bottom of this picture. It is a setup for test. They can't test the actual nozzle because it would be super over expanded at sea level. The thing in the pic is probably a stub skirt for test.
Remember they do have a vacuum chamber for testing these versions.
Quote from: JBF on 10/05/2012 11:18 amRemember they do have a vacuum chamber for testing these versions.Not for MVac.[/quoteMy mistake I was thinking of the dracos. Heh I wonder how big a setup you would need to actually test an MVac. Heat dissipation alone would be tough.
@iamlucky 13It seems to me that the manifold does taper around the circonference; right side is smaller, and we can't see behind.About nozzle extension maybe (maybe!) they could change material; titanium is 50% lighter than niobium with not so smaller high temp strenght.
Quote from: MP99 on 10/03/2012 07:11 amQuote from: modemeagle on 10/03/2012 12:07 amQuote from: iamlucky13 on 10/02/2012 11:48 pmQuote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.If you look in the background you will see a flex below the turbo pump. Notice the dark streaks in the exhaust. Compare it to the F-1 and the only conclusion is the turbo pump exhaust is pumped into the nozzle.Isn't the turbo-pump exhaust shown at the left of the pic, rather than being diverted into the nozzle? This would need to remain separate if v1.1 us is going to use the same roll control as v1.0.cheers, MartinI could be wrong, been know to happen from time to time.
Quote from: modemeagle on 10/03/2012 12:07 amQuote from: iamlucky13 on 10/02/2012 11:48 pmQuote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.If you look in the background you will see a flex below the turbo pump. Notice the dark streaks in the exhaust. Compare it to the F-1 and the only conclusion is the turbo pump exhaust is pumped into the nozzle.Isn't the turbo-pump exhaust shown at the left of the pic, rather than being diverted into the nozzle? This would need to remain separate if v1.1 us is going to use the same roll control as v1.0.cheers, Martin
Quote from: iamlucky13 on 10/02/2012 11:48 pmQuote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.If you look in the background you will see a flex below the turbo pump. Notice the dark streaks in the exhaust. Compare it to the F-1 and the only conclusion is the turbo pump exhaust is pumped into the nozzle.
Quote from: modemeagle on 10/03/2012 10:15 amQuote from: MP99 on 10/03/2012 07:11 amQuote from: modemeagle on 10/03/2012 12:07 amQuote from: iamlucky13 on 10/02/2012 11:48 pmQuote from: MP99 on 09/30/2012 10:47 pmCopied from the "general" thread:-Quote from: Lars_J on 09/30/2012 10:10 pmFirst picture of the Merlin 1D-Vac:https://twitter.com/elonmusk/status/252528724602400768QuoteElon Musk @elonmuskNow test firing our most advanced engine, the Merlin 1D-Vac, at 80 tons of thrust. pic.twitter.com/HGK1joVQI asked in the general thread, but my question was buried in the big long argument about T-shirts... ...what's the big ring around the base of the nozzle? The regen manifold is visible separately above it, so I know it's not that.If you look in the background you will see a flex below the turbo pump. Notice the dark streaks in the exhaust. Compare it to the F-1 and the only conclusion is the turbo pump exhaust is pumped into the nozzle.Isn't the turbo-pump exhaust shown at the left of the pic, rather than being diverted into the nozzle? This would need to remain separate if v1.1 us is going to use the same roll control as v1.0.cheers, MartinI could be wrong, been know to happen from time to time.I thought the area I've surrounded in black was the gas generator exhaust.cheers, Martin
Modemeagle saw it correctly, the flex is under the GG-turbo pump assembly, in the right place for the exaust.