Quote from: Kosmos2001 on 11/26/2017 01:31 pmWow! Those companies are growing like mushrooms in autumn after a rainy summer.And most will fade away just as quickly.
Wow! Those companies are growing like mushrooms in autumn after a rainy summer.
A Renton-based aerospace firm will begin testing rocket engines next year in a facility under construction at the Port of Bremerton.Radian Aerospace is involved in research and development of “aerospace hardware to serve a variety of customers,” according to a company representative....Incorporated in 2016, Radian Aerospace shares leadership with Holder Aerospace, a Renton company headed by former astronaut Livingston Holder and aerospace executive Curtis Gifford.
[Kitsap Sun] Secretive aerospace firm to test rocket engines in BremertonQuoteA Renton-based aerospace firm will begin testing rocket engines next year in a facility under construction at the Port of Bremerton.Radian Aerospace is involved in research and development of “aerospace hardware to serve a variety of customers,” according to a company representative....Incorporated in 2016, Radian Aerospace shares leadership with Holder Aerospace, a Renton company headed by former astronaut Livingston Holder and aerospace executive Curtis Gifford.Anyone know what's up with this company?
I also think so, yes. There's no market yet for so many launcher companies. At least experienced engineers could recycle and join the surviving companies.
Developing a small LV that will fly is only part of costs for these companies, building launch facilities and gearing up for large scale low cost manufacturing are the lions share of costs. RL latest round of investment was for something like $50M and that was for large manufacturing plus some rainy day money. Both LauncherOne and Vector are investing heavily in their production facilities, launch facilities are different again for these two companies, plane and mobile launcher.
RelativitySpace to 3D print complete LV.relativity-space-aims-to-3d-print-entire-launch-vehicles/?utm_content=buffer45f27&utm_medium=social&utm_source=twitter.com&utm_campaign=bufferThis is not that new, their competitors (Vector, RL, Firefly, Launcheone) are also aiming to do this. Everybody 3D prints engines and composite fuel tanks are additively/robotically manufactured. Human labour involved in final assembly may vary between companies but all will try to reduce manhours required over time.Relativity LV is 9+1 x15klbs Methane engines. Not stated but probably pressure feed as cheaper to build. 1250kg to LEO?. At this payload range they would also be up against Firefly and Boeing XS1. If all US cost same to build it will be interesting competition against reuseable XS1 and cheap expendable boosters. By 2021 RL should also be flying Electron successor, whatever that will be.
What we do know is it took SX about $200m to go from a flat lot to the first F9 launch, regardless of what industry cost models said it would cost.
Quote from: john smith 19 on 12/28/2017 10:31 pmWhat we do know is it took SX about $200m to go from a flat lot to the first F9 launch, regardless of what industry cost models said it would cost.More like $400M, and that's not for the current F9.
Airbreathing sucks.My turbopump project turns out to be ironically easier than my duct fan / ramjet projet up to now.
Hybrids already have more isp than solids for decades, real problems are mass ratio and endless of bugs.
Quote from: Katana on 12/30/2017 12:43 pmAirbreathing sucks.My turbopump project turns out to be ironically easier than my duct fan / ramjet projet up to now. Not really a big surprise to anyone who knows anything about ramjets or pump design. Quote from: KatanaHybrids already have more isp than solids for decades, real problems are mass ratio and endless of bugs.That's good to know. Perhaps you supply a reference where I can read more on them? What propellant combination did you have in mind?
Just a few points to consider.
Quote from: john smith 19 on 12/30/2017 09:12 amJust a few points to consider. Great post, Thank you!And now you have to find people who really think like that to get a team which gets things done. From time to time such a thing happens and the world is changed.
But when you have some decent turbomachinery, they have MUCH more bang per development effort than sluggish ramjets, though starting at a bit higher price.
LOX hydrocarbon (paraffin or PE) hybrids have theoretical isp same to kerosene, some test engines could even reach theoretical performance. However hybrids can't scale. This caused enormous trouble to SS2.https://web.stanford.edu/~cantwell/Recent_publications/Cantwell_IJEMCP_9_(4)_305-326_2010.pdf
Quote from: Katana on 12/31/2017 11:03 amBut when you have some decent turbomachinery, they have MUCH more bang per development effort than sluggish ramjets, though starting at a bit higher price.You seem to think "air breathing" begins and ends with ramjets. Quote from: KatanaLOX hydrocarbon (paraffin or PE) hybrids have theoretical isp same to kerosene, some test engines could even reach theoretical performance. However hybrids can't scale. This caused enormous trouble to SS2.https://web.stanford.edu/~cantwell/Recent_publications/Cantwell_IJEMCP_9_(4)_305-326_2010.pdfInteresting report. The contractor on SS2 inherited their tech from Amroc, using HPTB and multiple ports.The work at Stamford and SPG suggests a newer design would have the regression rate of a solid without needing multiple ports, hence having higher fuel loading and a stronger structure, so they would scale up.