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Originally Posted by good2go
(Post 1118313)
Is is just me, or does this thing seem to have the potential for major head gasket/seal issues? :confused:
IMO the most efficiency will be out of a jet engine style engine. Every change of motion in the piston requires energy which = waste. Currently jet engines are extremely inefficient however are well under developed. https://www.miataturbo.net/attachmen...ine=1396650668 |
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Jet engines are underdeveloped? lol what?
I wouldnt say axial turbine engines are inefficient, just not efficient over a wide range of operating speeds, which is a problem for cars. Cars are lame anyway. I want a rocket. https://www.miataturbo.net/attachmen...ine=1396652058 |
Originally Posted by triple88a
(Post 1118429)
IMO the most efficiency will be out of a jet engine style engine. Every change of motion in the piston requires energy which = waste. Currently jet engines are extremely inefficient however are well under developed. *edited to remove redundant picture |
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Originally Posted by triple88a
(Post 1118429)
Nope even though they show the cylinders spin, they don't spin. The cylinders are stationary in a revolver style thing. ... SO, let me get this straight: if the cylinders do not spin, then the cylinder 'head' MUST, right? Otherwise, how would each cylinder ever see the intake and exhaust porting, let alone a spark plug? I just don't see any way around having to seal two surfaces (constituting a cylinder and head) which are moving against one another. :confused: :confused: Or am I just having a senior moment? :nuts: https://www.miataturbo.net/attachmen...ine=1396656572 |
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Originally Posted by Full_Tilt_Boogie
(Post 1118436)
Jet engines are underdeveloped? lol what?
I wouldnt say axial turbine engines are inefficient, just not efficient over a wide range of operating speeds, which is a problem for cars. https://www.miataturbo.net/attachmen...ine=1396658311 simply make an electric car with a small turbine (pronounced tuhr BYNE, not turban) that spins up as needed. imagine a little pony keg sized turbine in a tesla. oh baby. |
Indeed underdeveloped for the reason being is that if you look at the end of WW2 where they first began being used, for quite a while they were just barely made to run. The last 10-15 years is where progress started taking off. Progression marks such as the scramjet are big leaps. The scramjet was mainly a theoretical lab engine until 10 years ago.
Yes i know they were designed before WW2 however being researched on a large scale vs a 1 man show with a tiny budged in his garage are different. Truth is piston engines have been researched for about twice as much time as jet engines. Give it another 40 years and see where jet engines are at. |
Not sure how real this is but rather interesting story.
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Re: turbine engines.
Large, multi-hundred-megawatt stationary turbines of the sort used for grid-scale power generation can reach or even exceed 60% efficiency in the very newest designs, but only when used in combined-cycle operation; one where the exhaust gas of the turbine is then used to boil water to drive a conventional steam turbine external to the primary turbine. (Source) https://www.miataturbo.net/attachmen...ine=1396700342 http://www.alstom.com/Global/Power/R...=upscalecanvas Incidentally, BMW is experimenting with combined-cycle operation pairing an exhaust-powered steam engine to a conventional piston engine, claiming a 15% overall efficiency enhancement. (Source) https://www.miataturbo.net/attachmen...ine=1396700342 In single-cycle mode, large gas turbines operate at around 35-40% efficiency, about the same as a modern diesel or GDI engine. This is the mode employed when driving an airplane, helicopter, etc. The General Electric 9HA, which bills itself as "The world's largest, most efficient gas turbine" claims 41% net efficiency at the shaft. It also weighs 866,000 lbs. (Source) https://www.miataturbo.net/attachmen...ine=1396700342 So-called "microturbines," those with power outputs comparable to what might be used in a highly efficient hybrid-style automobile, have thermal efficiencies in the neighborhood of around 25%, far lower than that of a conventional fuel-injected gasoline engine. (Source) Also, note that the turbine cited here, with a net output of 28Kw / 37.5 HP, stands 7 feet tall, 2 feet wide, 4 feet deep, and weighs over 1000 lbs. Some of that is obviously packaging which would not be needed in an automotive application. https://www.miataturbo.net/attachmen...ine=1396700342 The newest and most cutting edge designs are the so-called millimeter-scale "engine on chip" turbines, presently under development at places like MIT, which eventually promise to deliver hydrogen-fueled turbines to drive our laptops, cell-phones, etc. These devices are among the least efficient engines ever created by man, peaking at around 5-10% efficiency. (Source) https://www.miataturbo.net/attachmen...ine=1396700342 Also, triple88a, seriously? Comparing a RAMJET / SCRAMJET engine to a commercial turbofan engine in the context of a thread discussing engine efficiency is like comparing an NHRA top fuel dragster to a Toyota Camry. https://www.miataturbo.net/attachmen...ine=1396700342 Besides, everyone knows that wood gas is where it's at. https://www.miataturbo.net/attachmen...ine=1396700342 http://i.dailymail.co.uk/i/pix/2011/...51_638x366.jpg |
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On the subject of turbines...
The A-10 Thunderbolt II, also known as the Warthog, uses turbine engines. https://www.miataturbo.net/attachmen...ine=1396737417 Money shot: https://upload.wikimedia.org/wikiped...px-A10gun1.jpg I mean, just look at that fucking thing. You half-expect it to be piloted by this guy: https://www.miataturbo.net/attachmen...ine=1396737417 In addition to looking like death incarnate, it also contains the largest cannon to which an airplane had ever been attached; the 30mm GAU-8 Avenger. It's one thing to merely say "this is a big fucking gun," but it's another entirely to have a sense of scale. So here is the gun sitting next to a VW Beetle: https://www.miataturbo.net/attachmen...ine=1396737417 It should be noted that this is not an anachronistic comparison. The VW Beetle was still in current production and being sold in the US in 1972 when the A10 first flew, and in 1977 when it entered active service with the USAF. (The Beetle was last sold in the US in 1979.) This also gives you a sense of perspective on the normal service life of airplanes. Not enough of one, however. For that, you need to consider the B-52. https://www.miataturbo.net/attachmen...ine=1396737417 No, not that one. This one: https://www.miataturbo.net/attachmen...ine=1396737417 The B52 first entered service in 1955, the same year that Marty McFly went Back to the Future. And production ceased in 1963, meaning that the very youngest of the B52s presently in service are 51 years old. And get this- ACC (née SAC) expects them to continue operating into the 2040s, a 90 year lifespan! There will come a time when not a single active-duty member of the United States Air Force was even alive when the B52s under their command were built. Or, put another way, imagine if this airplane were still in active military service today, facing off against SAMs, phased-array radar and supersonic interceptors like the F-22 Raptor: https://www.miataturbo.net/attachmen...1&d=1396737972 That's kind of cool, actually. https://www.miataturbo.net/attachmen...ine=1396737417 |
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Originally Posted by Joe Perez
(Post 1118707)
...
The A-10 Thunderbolt II, also known as the Warthog ... contains the largest cannon to which an airplane had ever been attached; the 30mm GAU-8 Avenger. ... https://www.miataturbo.net/attachmen...ine=1396742815 https://www.miataturbo.net/attachmen...ine=1396742815 https://www.miataturbo.net/attachmen...ine=1396742815 https://www.miataturbo.net/attachmen...ine=1396742815 |
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Attachment 108700 http://takakiauto.com/sites/default/...pider_nest.jpg |
Originally Posted by Joe Perez
(Post 1118707)
On the subject of turbines...
The A-10 Thunderbolt II, also known as the Warthog, uses turbine engines. |
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Originally Posted by good2go
(Post 1118724)
Negatory! That distinction may be held by the Lockheed AC-130U gunship (or similar variants) which is equipped with no less than a 105mm howitzer AND a 40mm Bofors cannon:
https://www.miataturbo.net/attachmen...1&d=1396785987 My specific phrasing of "the largest cannon to which an airplane had ever been attached" was not incautious. It was meant as a reference to the following poorly-written but humorous observation which everyone except for you has already seen. :giggle: https://www.miataturbo.net/attachmen...1&d=1396785987 Of course, crew-served weapons are inherently safer than light arms in the hands of children. They also build teamwork skills. https://www.miataturbo.net/attachmen...ine=1396786850 Which brings us to the Count-a-Shot MOD.1, a device being marketed by Leitner-Wise to the US Arms for the purpose of keeping a realtime count of rounds fired and providing a visual representation of same. http://www.tactical-life.com/wp-cont...countashot.jpg So that's cool. http://img2.wikia.nocookie.net/__cb2...e-rifle-12.jpg |
Originally Posted by Joe Perez
(Post 1118540)
Incidentally, BMW is experimenting with combined-cycle operation pairing an exhaust-powered steam engine to a conventional piston engine, claiming a 15% overall efficiency enhancement. (Source)
https://www.miataturbo.net/attachmen...ine=1396700342 http://25.media.tumblr.com/bb9abd47f...wqrdo1_500.jpg |
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Star being pulled near a black hole.
Edit: Apparently it is a computer sim and is the equivalent of a 139 day time lapse. https://www.miataturbo.net/attachmen...ine=1396798972 |
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