A lot of people say kind things about me but it's not really an intellectual issue quite frankly but a matter a of being bold enough to challenge what people tell you. If you think something can be done, well ... go away and work it out.
What I'm not clear about is wheather this involves the initial combustor design or the one they developed as part of the LAPCAT prgramme, whose results were simulated by their Italian partners as being 1% of the NOX levels of a conventional system.
Detailed estimates of the NOX emissions have not yet been calculated by the rocket designers [R. Varvill, 2015, personal communication]. For this study, reliable estimates of NOX emissions from jet and rocket engines are scaled to the Skylon vehicle with the caveat that our estimates have high uncertainty. Lee et al. [2010], using the International Civil Aviation Organization (ICAO) emissions databank
Reaction Engines Ltd @ReactionEngines 39m39 minutes agoWork progressing three months on from #SABRETF1 ground breaking @WestcottVP, an impressive 350m of embankment to complete!
Quote from: Global atmospheric response to emissions from a proposed reusable space launch systemDetailed estimates of the NOX emissions have not yet been calculated by the rocket designers [R. Varvill, 2015, personal communication]. For this study, reliable estimates of NOX emissions from jet and rocket engines are scaled to the Skylon vehicle with the caveat that our estimates have high uncertainty. Lee et al. [2010], using the International Civil Aviation Organization (ICAO) emissions databankWhile the study is after the A2 work, it does not consider it. I'm not certain whether the Scimitar NOx optimisations would apply to the SABRE engine.
A large amount of money is being made available by the US DoD for testing the precooler in a hypersonic wind tunnel.
This is the main bit of audio (59MB):https://drive.google.com/open?id=0BwJNUxZZ7qItNWpmS3RiX2FKWG8I had to start recording again during questions: https://drive.google.com/open?id=0BwJNUxZZ7qItMWRTMDBMelJyRlU
Reaction Engines now under contract with DARPA!https://www.reactionengines.co.uk/reaction-engines-awarded-darpa-contract-to-perform-high-temperature-testing-of-the-sabre-precooler/
Quote from: francesco nicoli on 09/25/2017 11:31 amReaction Engines now under contract with DARPA!https://www.reactionengines.co.uk/reaction-engines-awarded-darpa-contract-to-perform-high-temperature-testing-of-the-sabre-precooler/Yet more development work I suspect not unrelated to the so called SR-72 amongst other things.
Fabricate a scaled prototype of the heat exchanger utilizing the proposed manufacturing approach. Conduct testing in a relevant laboratory environment. Develop and validate performance and lifting models based on the testing. Utilize this information to increase the understanding of how the heat exchanger integrates into a platform or platforms
Quote from: Star One on 09/25/2017 11:10 pmQuote from: francesco nicoli on 09/25/2017 11:31 amReaction Engines now under contract with DARPA!https://www.reactionengines.co.uk/reaction-engines-awarded-darpa-contract-to-perform-high-temperature-testing-of-the-sabre-precooler/Yet more development work I suspect not unrelated to the so called SR-72 amongst other things.I thought it was phase II of AF161-074: Durable Pre-cooling Heat Exchangers for High Mach Flight, so more testing than development, I thinkQuoteFabricate a scaled prototype of the heat exchanger utilizing the proposed manufacturing approach. Conduct testing in a relevant laboratory environment. Develop and validate performance and lifting models based on the testing. Utilize this information to increase the understanding of how the heat exchanger integrates into a platform or platforms
"We've been saying hypersonics is two years away for the last 20 years, but all I can say is the technology is mature and we, along with DARPA and the services, are working hard to get that capability into the hands of our warfighters as soon as possible," Rob Weiss, Lockheed Martin's executive vice president and general manager for Skunk Works, told Aviation Week.
The advanced aircraft division also said that it was getting close to starting full scale development of a flight research vehicle (FRV) that could be piloted or operated remotely. This FRV is expected to be about the size of an F-22 and use a full combined cycle propulsion system, according to Aviation Week.Lockheed Martin optimistically plans to fly an FRV in the early 2020s.
Could I ask because I saw someone else wondering this elsewhere online but are certain aspects of REL’s engine technology classified? I know they’ve had a bit of an unfortunate history with the government classifying their technology in the past.
Quote from: Star One on 09/27/2017 04:33 pmCould I ask because I saw someone else wondering this elsewhere online but are certain aspects of REL’s engine technology classified? I know they’ve had a bit of an unfortunate history with the government classifying their technology in the past.As I understand it:Alan Bond patented his original precooled engine ideas and assigned them to Rolls Royce around 1983-4, at which point the UK government classified them. Rolls-Royce pulled out of HOTOL, and Bond, Varvill, and Scott-Scott set up REL in 1989.REL designed SABRE to work around the patents/classification and avoided applying for patents in the hope that they would not be classified again.The patents were eventually granted in 1991 after a change in government policy set the bar for making secrets higher. The RB545 details were published by Mark Hempsell in May 1993.REL relied on keeping the SABRE technology a trade secret, until 2013 when they applied for patents on a number of key factors.Parts of the work Reaction Engines Inc have done may be covered by ITARI am not aware of any aspects of SABRE/Skylon being classified, but if they were, would we know? I think Alan Bond would have complained about it if it had been
Quote from: JCRM on 09/27/2017 10:09 pmREL relied on keeping the SABRE technology a trade secret, until 2013 when they applied for patents on a number of key factors.I thought things like how they stop the precooler icing up were not publicly known.
REL relied on keeping the SABRE technology a trade secret, until 2013 when they applied for patents on a number of key factors.
Found this recent presentation given to RAL Space;https://www.ralspace.stfc.ac.uk/Pages/MarkThomas-SABRE.pdfNot heavy on detail but some new imagery;