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But you still haven't addressed: we've made VTOL aircraft, so why aren't they used?
As I said "normal" aircraft and orbital RLVs have not that much in common. An orbital RLV would be designed to accelerate to a speed of Mach 26 in a few minutes, it would most likely use cryogenic fuels and be a whole lot more complex in its design than an airliner.
That VTOL aircraft are impractical doesn't mean that VTOL launch vehicles are inferior to spaceplanes.
If the task is to get into orbit (instead of cruising around at 30,000 feet) a VTOL design is better suited to fulfil it: It's shape (cylindrical/spherical) can accomodate a larger fuel load, it doesn't need wings to land (which are dead weight in space) and it flies straight up, out of the denser layers of the atmosphere while a spaceplane would have to accelerate within the atmosphere (otherwise it cannot put to use its combined cycle engines) and therefore would encounter quite substantial energy losses due to atmospheric drag, no to mention the resulting heating of the airframe.
Don't get me wrong, I like the idea of spaceplanes, I just think a VTOL design would be the more rational choice.
Are you saying its easier to turn a plane vertical, land it horizontal, and repeat, then take off, land, turn around, and repeat? It seems a lot easier to me if you take off and land using the same equipment. And faster.
But that's what you do! You take off and land using the same method. VTOL stands for vertical take off *and* landing.
From my families experience in the defense field, HTOLs are much more favorable. The military doesnt want a VTOL, or else there would be new versions of the harrier.
We're talking about orbital RLVs here, not fighter jets. The two are hardly comparable.
it would also be easier to turn around an HTOL spaceplane for regular traffic. land, refuel, take off.
Same with a VTOL launch vehicle: Land, refuel, take off.
HTOLs could also be modified for aircracft carriers as long distance bombers. A VTOL that will go suborbital is very hard to launch off a carrier, while a catapult could boost the HTOL, giving it a push.
VTOL vehicles *can* be launched from carriers, if there ever should need be. I'll provide you with a link to a study on this done in the 60s. Just a moment...
I think the problem with nuclear jet engines is that their exhaust is radioactive, just as the exhaust of NTRs. The public would never allow such a system to be put into service.
From New York to Tokyo in two hours time can be achieved far easier with VTOL designs. Look at the Japanese Rocket Society's Kankoh Maru for example. It is designed to be able to land at any major airport and it actually requires less infrastructure to be in place than a HTOL spaceplane; it doesn't need a runway. Also its development would be not that expensive, all the required technology already exists. No need to develop some breakthrough combined cycle engine.
Well done. But you should have explicitely stated that you expect them to answer you. I did this when I wrote them an e-mail concerning global warming and they actually replied within a few days. However, they didn't address the specific points I had raised but gave me some links to greenpeace websites which didn't offer anyting new...
Probably. Still it would be politically impossible.
*reads through winamp playlist*
Abba, Avril Lavigne, Badly Drawn Boy, Beach Boys, Bj?rk, Blues Brothers, Britney Spears (forget that;)), Deep Purple, Delphonics, Elvis Presley, Eminem, Fugees, Genesis, Notwist, Phil Collins, Pink Floyd, Robbie Williams, Smash Mouth, Strokes, Tom Petty, U2, Village People,...
I also like classical music (Beethoven, Tschaikowsky, Saint-Saens, Dvorak, Elgar, Barber,...) and film music (John Williams, Alan Silvestri, Jerry Goldsmith, James Horner, Danny Elfman, Nino Rota,...).
I'm not kidding you, I like all of them.
VTOL. It's possible using today's technology.
Success. Shenzou IV has been launched.
http://www.spacedaily.com/news/china-02 … Shenzhou-4 Primed For Take Off This Weekend Great, finally they get moving again.
From www.gravity-society.org:
Information we received by Marc G. Millis states that ?the NASA Breakthrough Propulsion Physics Project has been cut [...] Although efforts are underway to restore funding, it is too soon to know if these efforts will succeed. Closely related to this, the NASA tests of Podkletnov's 'gravity shielding' claims, managed by the Marshall Space Flight Center, have run out of funds short of the completion of the hardware necessary to test the claims"
What the hell is going on here...
Wow! That is really impressive... Just how poisonous are these fuels? Would it be possible to use them when launching from a pad in the vicinity of populated areas (cape canaveral)?
I know what you mean...
Fukuyama wrote (in his book "The end of history") that history should be over with the end of the cold war. According to him we were now somehow living in the best of all possible worlds. Recently he admitted that he hadn't thought about how new scientific developments might change the world.
Just how dumb does one have to be not to realize that science and technological progress is one of the most important driving forces in history? And this idiot is a prof...[sigh]
dicktice
Maybe it's one of these rumoured zero-point-energy devices, then it wouldn't have to use batteries or rely on an external power-source.
Your argument "that even the most far-out physics don't contemplate the possibility" [of anti-gravity] doesn't hold any water. Mainstream science has been wrong time and again. Remember Lord Kelvin saying: "Heavier than air flying machines are impossible". He was one of the most recognized scientists of his time. Another one: Newspapers refused to print stories about the first flight of the wright brothers because the so called 'scientists' of the day told them such a feat was 'impossible'. *Nothing* has changed since then: 'Ordinary people' and mainstream journalists are as ignorant as ever and rely on the science establishment to tell them what to make of a new discovery, if it "violates the known laws of physics" or not.
Experimental data, not theory, decides what is possible and what is not.
BTW: There are numerous theories regarding the Podkletnov effect. Two scientists, Ning Li and Douglas Torr, predicted the effect independently and prior to Podkletnov's experiment.
From www.personalflightsystems.com:
Our first product is the PFS-400 aircraft. Its market advantages include:
Silent
2 hour training from zero-to-moderate flight skill capability
Take-off and landing in 8?x12? footprint
Nearly crash-proof
No rapid-movement mechanical systems in primary propulsion array
HITS compliant
Lowest maintenance compared to other solutions
Little or no vibration
Unlimited flight time [!]
Not a balloon
No bio-interface to X-rays
No runway required
No propeller needed to stay aloft
Wow, I want to see one of these in action. Must be some kind of anti-gravity device.
Chinese Space Robot Seeks Employment On ISS
"A robot arm made in China is trying to earn a placement on the International Space Station (ISS) and participate in the construction of the large multinational orbiting outpost."
Sorry, I didn't find the article to be convincing at all. Mars fits in right now.
The commission has released its final report. Check it out.
Uhm, I read that EELV stands for *Evolved* Expendable Launch Vehicle. I'm splitting hairs I know...
I just did a search and found this article: Did Newton Get It Wrong?. It's dated october 2002.
""We've seen his work, and we'd like to see it developed further," says Boeing spokesman Dave Phillips."
They have seen his work? What does that mean? Did they travel to Russia and paid Podkletnov a visit in his lab? Anyway, the people at Boeing apparently actually believe that this is for real.
BTW: Is there anything new on Boeing's GRASP project?
Well, nearly another month has passed and we still haven't heard from Ron.
Maybe no news is good news ... I don't know!
Well, they are reported to have begun testing in September. It may well take them till the end of the year or even longer. Patience...the truth will come out some day.
I read that article by Carlton Meyer, too. Never heard of him either.