Quote from: envy887 on 07/14/2017 09:06 pmQuote from: Space Ghost 1962 on 07/14/2017 09:04 pmQuote from: Jim on 07/14/2017 08:59 pmQuote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrongJim's right on this one. Failure of an engine on CRS-1. That was a M1C, which wasn't close to 200 klbf class (more like 85-110k) and was a quite different engine.M1D is 100% on 300+ flightsSuggest that the inconsistent subjective context here opens up ambiguity that some attempt to drive a truck through.Yes M1D is 100% AFAIK. But "Merlin" ... isn't. And yeah its kinda silly.After a while its a "two bit" behavior. And the constant Musk version of the Simpson's "Malibu Stacy has a new hat" does get on the nerves, like jeesh it's a rocket of course and why should it matter for just about any little thing.Things that matter though climb above this.
Quote from: Space Ghost 1962 on 07/14/2017 09:04 pmQuote from: Jim on 07/14/2017 08:59 pmQuote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrongJim's right on this one. Failure of an engine on CRS-1. That was a M1C, which wasn't close to 200 klbf class (more like 85-110k) and was a quite different engine.M1D is 100% on 300+ flights
Quote from: Jim on 07/14/2017 08:59 pmQuote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrongJim's right on this one. Failure of an engine on CRS-1.
Quote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrong
100% engine flight success rate
Quote from: envy887 on 07/15/2017 01:48 amWhat matters is that SpaceX has proven that they can make incredibly capable but low cost space hardware in house. Expecting them to do so with commsats is not unrealistic.It is unrealistic. There is a difference between low cost and 2 million per spacecraft
What matters is that SpaceX has proven that they can make incredibly capable but low cost space hardware in house. Expecting them to do so with commsats is not unrealistic.
Quote from: Jim on 07/15/2017 02:15 amQuote from: envy887 on 07/15/2017 01:48 amWhat matters is that SpaceX has proven that they can make incredibly capable but low cost space hardware in house. Expecting them to do so with commsats is not unrealistic.It is unrealistic. There is a difference between low cost and 2 million per spacecraftTen years ago if you told people that SpaceX would be able to make a restartable, re-usable kerolox engine with a >99.8% reliability rate, a TWR of over 200, and have it cost ~$1 million a piece, people would ask what your are smoking.There's an awful lot of horizontal bloat and very little economies of scale in satellite construction, just like rockets. SpaceX has proven time and time again to have the ability to dramatically reduce costs compared to today's ossified, sclerotic organizations.We're also talking about a 600kg LEO sat, not a 6000kg GSO bird.
Also, almost certainly NOT using RAD-hard electronics but rad resistant and redundant electronics. Should reduce the intrinsic unit cost a lot.They're also only supposed to last 4, maybe up to 7 years.If you're making thousands of them, you probably will be able to beat the $5m apiece price that Iridium satellites were in the 1990s.
Quote from: Robotbeat on 07/14/2017 09:08 pmQuote from: Jim on 07/14/2017 08:59 pmQuote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrongNot wrong for Merlin 1D, the only engine made entirely in house.To pile on here, the failure on the 1C engine was due to a manufacturing flaw introduced by a process that doesn't exist on the 1D. There have been no 1D failures in flight to date.
Quote from: Jim on 07/14/2017 08:59 pmQuote from: envy887 on 07/14/2017 08:36 pm 100% engine flight success rate that is wrongNot wrong for Merlin 1D, the only engine made entirely in house.
Quote from: Robotbeat on 07/15/2017 06:32 pmAlso, almost certainly NOT using RAD-hard electronics but rad resistant and redundant electronics. Should reduce the intrinsic unit cost a lot.They're also only supposed to last 4, maybe up to 7 years.If you're making thousands of them, you probably will be able to beat the $5m apiece price that Iridium satellites were in the 1990s.Iridium Next build rate = 5 per month.One Web build rate goal = 38 per month (improvement of 7X over IN)SpaceX build rate rate goal = 200 per month (Improvement of 5X over OW [35X over IN])
I bet Falcon won't be used for launching the constellation by the time they're doing the full 12,000 satellite version. I expect launch costs to be an even smaller proportion of costs.
Bottom line: best evidence indicates that SpaceX does not have the requisite well resourced engineering R&D team assigned to ITS nor will they be available real soon now.
Quote from: philw1776 on 07/16/2017 12:38 pmBottom line: best evidence indicates that SpaceX does not have the requisite well resourced engineering R&D team assigned to ITS nor will they be available real soon now.The development teams are not the obstacle. As long as they are able to keep paying their staff and maintaining Hawthorne and McGregor they have all the development capacity they need. As soon as they complete their Falcon development which will be by the end of this year.Building a large pad and a large factory for ITS are more difficult to finance.
Most of those Hawthorn & McGregor engineers are not new product development engineers. They're production and test. Some evidence of lack of a serious R&D staff assigned to ITS can be gleaned from the incomplete state of the 2 year delayed ITS plan finally revealed last September and the real soon now delayed announcement of an ITS update, likely a serious revision of the incomplete (q.v. development cost, launch site aspects, etc.) insufficiently vetted September 2016 plan. It is not news as Elon has said that re-assigning the development team to ITS awaits the completion of the items I cited.I have always contended that available R&D cash is THE largest obstacle to ITS success and certainly to schedule.
Quote from: guckyfan on 07/16/2017 12:57 pmQuote from: philw1776 on 07/16/2017 12:38 pmBottom line: best evidence indicates that SpaceX does not have the requisite well resourced engineering R&D team assigned to ITS nor will they be available real soon now.The development teams are not the obstacle. As long as they are able to keep paying their staff and maintaining Hawthorne and McGregor they have all the development capacity they need. As soon as they complete their Falcon development which will be by the end of this year.Building a large pad and a large factory for ITS are more difficult to finance.Most of those Hawthorn & McGregor engineers are not new product development engineers. They're production and test. Some evidence of lack of a serious R&D staff assigned to ITS can be gleaned from the incomplete state of the 2 year delayed ITS plan finally revealed last September and the real soon now delayed announcement of an ITS update, likely a serious revision of the incomplete (q.v. development cost, launch site aspects, etc.) insufficiently vetted September 2016 plan. It is not news as Elon has said that re-assigning the development team to ITS awaits the completion of the items I cited.I have always contended that available R&D cash is THE largest obstacle to ITS success and certainly to schedule.