Quote from: ugordan on 12/06/2017 01:53 PM2 km/s is not a small number for a kerolox stage, hence why I'm pretty skeptical we'll be seeing this happen.That's true, but this stage would be lightly loaded for the TMI burn and completely loaded after that, which should improve the delta-V noticeably.

2 km/s is not a small number for a kerolox stage, hence why I'm pretty skeptical we'll be seeing this happen.

Sorry if I missed this but has the TEL been moved back into the HIF? Last I heard it was on the pad for modifications.

Quote from: Proponent on 12/07/2017 02:13 PMThat's true, but this stage would be lightly loaded for the TMI burn and completely loaded after that, which should improve the delta-V noticeably.I think you have that backwards, but good point. What's the mass ratio between a roadster and an FH S2?

That's true, but this stage would be lightly loaded for the TMI burn and completely loaded after that, which should improve the delta-V noticeably.

Quote from: cscott on 12/07/2017 02:21 PMQuote from: Proponent on 12/07/2017 02:13 PMThat's true, but this stage would be lightly loaded for the TMI burn and completely loaded after that, which should improve the delta-V noticeably.I think you have that backwards, but good point. What's the mass ratio between a roadster and an FH S2?Quite right, I meant unloaded and have corrected my previous post accordingly.This site gives 2690 kg for a 2010 Tesla Roadster. And this one won't need its full complement batteries, so it could easily be quite a bit lighter. Either way, it's much less than Falcon Heavy's stated TMI payload of 16,800 kg.On the Falcon simulation threads, someone must have worked pretty hard on estimating the stage's relevant masses, but let's start with Space Launch Report's estimates that the stage's dry mass at about 4100 kg and the propellant load a bit over 100,000 kg. So, with the standard TMI payload, the mass ratio is 5.79 and the delta-V is 6000 m/s, assuming a vacuum specific impulse of 348 s.Replace the standard TMI payload with a Tesla Roadster, and we've got a mass ratio of 15.7 and a delta-V of 9400 m/s. In other words, we pick up an extra 3400 m/s, even if we assume that the Roadster remains attached to depletion. And we actually do a little better than that, since the delta-V provided by the boosters and first stage will increase a bit due to the decreased payload mass. Jettison the Roadster after TMI, and the delta-V increases further.These numbers are rough, but they do suggest there is some delta-V to play with.

Quote from: Proponent on 12/07/2017 03:27 PMThis site gives 2690 kg for a 2010 Tesla Roadster. And this one won't need its full complement batteries, so it could easily be quite a bit lighter. Either way, it's much less than Falcon Heavy's stated TMI payload of 16,800 kg.On the Falcon simulation threads, someone must have worked pretty hard on estimating the stage's relevant masses, but let's start with Space Launch Report's estimates that the stage's dry mass at about 4100 kg and the propellant load a bit over 100,000 kg. So, with the standard TMI payload, the mass ratio is 5.79 and the delta-V is 6000 m/s, assuming a vacuum specific impulse of 348 s.Replace the standard TMI payload with a Tesla Roadster, and we've got a mass ratio of 15.7 and a delta-V of 9400 m/s. In other words, we pick up an extra 3400 m/s, even if we assume that the Roadster remains attached to depletion. And we actually do a little better than that, since the delta-V provided by the boosters and first stage will increase a bit due to the decreased payload mass. Jettison the Roadster after TMI, and the delta-V increases further.These numbers are rough, but they do suggest there is some delta-V to play with.Those are pounds, not kg. See the curb weight at Car and Driver:https://www.caranddriver.com/reviews/2010-tesla-roadster-sport-instrumented-test

This site gives 2690 kg for a 2010 Tesla Roadster. And this one won't need its full complement batteries, so it could easily be quite a bit lighter. Either way, it's much less than Falcon Heavy's stated TMI payload of 16,800 kg.On the Falcon simulation threads, someone must have worked pretty hard on estimating the stage's relevant masses, but let's start with Space Launch Report's estimates that the stage's dry mass at about 4100 kg and the propellant load a bit over 100,000 kg. So, with the standard TMI payload, the mass ratio is 5.79 and the delta-V is 6000 m/s, assuming a vacuum specific impulse of 348 s.Replace the standard TMI payload with a Tesla Roadster, and we've got a mass ratio of 15.7 and a delta-V of 9400 m/s. In other words, we pick up an extra 3400 m/s, even if we assume that the Roadster remains attached to depletion. And we actually do a little better than that, since the delta-V provided by the boosters and first stage will increase a bit due to the decreased payload mass. Jettison the Roadster after TMI, and the delta-V increases further.These numbers are rough, but they do suggest there is some delta-V to play with.

Quote from: Basto on 12/07/2017 02:15 PMSorry if I missed this but has the TEL been moved back into the HIF? Last I heard it was on the pad for modifications.I believe yesterday it was still up at the pad. Most of the crews at 39A went over to 40 to help.

So is 39-A still capable of launching a Falcon 9 or has the configuration for Falcon Heavy taken that capability away?