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The Aviation Historian issue 23 has an extensive article on the compressibility problems of the P-38 and makes a very convincing argument that the cause was the wing/fuselage pod junction. Included are a few pictures from NACA that I havent seen elsewhere.

Also illuminating in this article;

The British manager for the P-38 had W.E.W. Petter of Westland evaluate the problem; "He says that they have invariably had trouble when they have required that the air should expand simultaneously in two planes, as for instance when a body is mounted on a wing and its streamline tail coincides with the trailing edge of a wing, or when a fin and tailplane intersect and their trailing edges are roughly in the same plane."

Lockheed took issue with the testing NACA performed, even though they found the same improvement with extending the center pod over the course of multiple tunnel test. One NACA report on this is still unavailable to the public.

Lockheed started experimenting with a lengthened pod on its own in the fall of 1941, retrofitting two aircraft (!)

Highly recommended issue!
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Aerospace / Re: UK Spaceport
« Last post by TomS on Today at 06:18:12 pm »
Why not using some places closer to the equator? I guess it would be the most northernly launch site in the world.

SvalRak has it beat at 79 North.  Just sounding rockets, though.

The intent is to launch small sats, many of which go to polar orbits anyway.  They're interested in Electron as a potential launcher, which currently operates out of New Zealand.
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While researching the Hecht i've been confused by different lengths given by different sources :

- Luftarchiv.de says it was 1.75m
- A book titled "Warfare and the Third Reich: The Rise and Fall of Hitler's Armed Forces" says 8 feet https://books.google.dz/books?id=pYABCgAAQBAJ&pg=PT90&lpg=PT90&dq=hecht+gliding+bomb&source=bl&ots=BQrMHJjAeX&sig=6EUY_4dwMkOyY1jGhpG1ntR1s9Q&hl=fr&sa=X&sqi=2&ved=0ahUKEwii9efboaLcAhWHERQKHRckBLIQ6AEIRTAH#v=onepage&q=hecht%20gliding%20bomb&f=false
- Apparently in  „Typenkompass – Deutsche Raketen und Lenkwaffen“ 5.88m is given.
- At some random blog i've seen 4.8m.

I wonder which one of these numbers you guys think is the correct one.

Thanks.
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Aerospace / Re: Boeing 'Middle of the Market” (MOM) Airliner
« Last post by Moose on Today at 03:43:40 pm »
AvWeek with an article that is pretty skeptical about the NMA/797 market and prospects for long-term success.
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I'm with kaiserd #4.

The influence of Marcel, then Serge was out of all proportion to the firm's attributes, and starts with Bloch's success in not being absorbed into a State-entity in 1937. The line Ouragon-Mystere-Mirage III was estimable, but not beyond the scope of the Nationalised sites: success bred hubris. That featured in the recalled Saviour President, 1/59. So, Mirage IVA/Force de Frappe. UK and US tried to dissuade such proliferation/duplication - expensive dilution of France's economy, undermining the D'Artagnan, all-for-one essence of NATO. CDG suggested UK itself might examine exactly that: UK failed to grasp his logic.

UK, 1/65 reduced its Requirement for a deep nuclear penetrator to 40 strike/10 trainers: that killed TSR.2, whose cost would be untenable on so small an order, so UK joined McNamara's  planned 3,000 TFX. BAC pitched Mirage IV/Spey, but Defence Secretary Healey accepted F-111K and attended to a much larger Requirement to replace F-4K on CVA-01 and F-4M in RAFG. He could have joined any one of the plethora of French/FRG/Italian/US V/STOL schemes, whose raison d'etre was runways being Scudded. But he chose to presume intact pistes and to invent AFVG. Marcel soon caused CDG to uninvent his subordination to BAC, who were thus left to doodle doomed UKVG...until Marcel's hubris came to the rescue.

France was admitted to the F-104 Group's discussion of an NKF and cheerfully announced the problem was resolved: the others could share the perspex, wheels and brakes on anyMirage. Excommunicated. Healey in, like rat up drainpipe. Tornado. Serge then did the same. Typhoon. US tried hard to kill both.

If... French politicians had reined in Marcel and Serge, reminding them who pays their bills, then...the collaborations that worked on Concorde, ELDO....and on to borderless Airbus/MBDA, could have been earlier, extravagent duplication Tornado/Mirage 2000, Rafale/Typhoon avoided. Thank the Lord that we have all learned for the next generation.
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Aerospace / Re: UK Spaceport
« Last post by Flyaway on Today at 02:47:18 pm »
Press Release;

Quote
Sutherland could be a new site for vertically-launched space rockets and satellites as the Government makes Ł2 million available to fund further horizontal launch spaceport sites across Britain – including Newquay, Glasgow Prestwick and Snowdonia – subject to business case.

The Sutherland spaceport, which could see lift-off from the early 2020s and create hundreds of new jobs, is one of a number of Government-backed space projects that will be announced at the Farnborough International Airshow.

The commercial space sector is estimated to be worth a potential Ł3.8 billion to the UK economy over the next decade and will support Britain’s modern Industrial Strategy by creating high-skilled jobs and boosting local economies.

UK Space Agency selected the Sutherland site because Scotland is the best place in the UK to reach highly sought-after satellite orbits with vertically launched rockets.

Initial funding of Ł2.5 million will go to Highlands and Islands Enterprise to develop the launch site in Sutherland, which will use innovative rocket technology to ensure Britain is a leading force in the global spaceflight market.

Horizontal launch sites have potential to play a key role in the UK’s future spaceflight market, attracting companies from all over the world to invest in Britain for the launch of their sub-orbital flight, satellite launch and spaceplane ambitions.

Business Secretary Greg Clark said: “As a nation of innovators and entrepreneurs, we want Britain to be the first place in mainland Europe to launch satellites as part of our modern Industrial Strategy. The UK’s thriving space industry, research community and aerospace supply chain put the UK in a leading position to develop both vertical and horizontal launch sites.

“This will build on our global reputation for manufacturing small satellites and help the whole country capitalise on the huge potential of the commercial space age.”

Charlotte Wright, Chief Executive of Highlands and Islands Enterprise (HIE), said: “The decision to support the UK’s first spaceport in Sutherland is tremendous news for our region and for Scotland as a whole. The international space sector is growing and we want to ensure the region is ready to reap the economic benefits that will be generated from this fantastic opportunity.”

Will Whitehorn, Non-Executive Chairman of Clyde Space said: “From designing and building the very first satellite in Scotland, Clyde Space has grown and become a front runner in small-satellite manufacturing.  Having a spaceport located in Scotland will bring about a whole host of commercial advantages and not only to our operations in Glasgow, but to the entire space sector in the whole of the UK.”

Peter Platzer, CEO of Spire Global, said: “A spaceport in Scotland and the UK is fantastic news! Launch continues to be the most unpredictable part of the overall supply chain, with delays, often for months and sometimes years, being the norm. In Spire, Scotland already sports Europe’s most advanced and prolific satellite manufacturing capability, and with a space port right next door, enabling clockwork like launches, we can finally get our space sector supply chain to be truly integrated!”

Graham Turnock, Chief Executive of the UK Space Agency, said: “This grant will help to kick-start an exciting new era for the UK space industry, and this is only the beginning of our LaunchUK campaign. We are committed to supporting a commercial market for access to space in the UK, and we will continue to engage with any company who seeks to operate here.”
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Actually you’d hope they’d learn from the JWST for any future similar telescope.


Learn what?

Please inform us less knowledgable on what could be learned from JWST?   And please leave out the urban and myths of the uninformed.

Well the fact that LUVOIR is JWST’s big brother. Half the issue with the JWST is the fact that it has been pioneering a whole host of cutting edge technologies. That means that hopefully that when it comes to LUVOIR things will be easier a second time around.
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Aerospace / Re: UK Spaceport
« Last post by TomcatViP on Today at 01:45:55 pm »
Why not using some places closer to the equator? I guess it would be the most northernly launch site in the world.
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Aerospace / Re: UK Spaceport
« Last post by Flyaway on Today at 01:35:01 pm »
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Aerospace / Re: Future Combat Air System (FCAS)
« Last post by mrmalaya on Today at 01:07:39 pm »
Well the Combat Air Strategy is definitely on for tomorrow, but what will it bring? Can we hope for a genuinely national project?
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