Martin Jetpack Climbs 5000 Feet Above Sea Level 178
rh2600 writes "For years the Martin Jetpack has stayed just a few feet off the ground, invoking frequent suspicion about its true abilities. Well, today that all changed [video] with the first climb test in New Zealand (with weighted crash-test dummy) reaching over 5,000 feet above sea level. The emergency parachute test was also a success. Kiwis can indeed fly."
FINALLY!! (Score:2)
Where was this thing when you needed it the most???
Re:FINALLY!! (Score:4, Funny)
Now I can FLY!!!
Yeah, but did he solve the icing problems?
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Bill
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Yeah, but did he solve the icing problems?
As long as he doesn't try to do Rio - Paris, he should be OK.
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Tony Stark was able to build this in a cave! With a box of scraps!
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Ever since reading Heinlein's The Puppet Masters [wikipedia.org], I have yearned for a sky car to go hundreds of miles in a few minutes. Of course, I haven't yearned for the accompanying alien parasitic slugs, but like with everything else in life, there'
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You can make cars that'll travel in 9 feet of horseshit. I don't think you cam make a horse do that.
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Not that I wouldn't want one...
And if one were to dispense with the part 103 compliance, would they need a helicopter or fixed-wing license?
Endurance (Score:2)
So it can go up to 5000 ft if it uses up all its fuel getting there, and then parachutes back down? Still not totally practical.
Also they used a crash test dummy? Couldn't they find a darwin award volunterr?
Re:Endurance (Score:5, Informative)
Earlier in the program [2:03] Mr. Martin refers to 'flying around for up to 30 minutes'. and at [7:17] in the video there's a call of 800 ft/min climb rate. Methinks you can get a lot better than just up to 3500 ft AGL.
BTW - Aviation authorites have little or no sense of humour. Testing equipment with live (perhaps deserving) volunteers without testing the safety systems will get you shut down, in a very official and unpleasant manner.
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Not likely, rate of climb drops a lot as altitude goes up. I am not sure that these engines are turbocharged but if not then the power really starts to drop as you go up as the air gets less dense. But that depends on what you mean by a lot. If you mean 6000 ft above sea level then maybe If you mean 10k I just don't think so. Oh AGL? That is all about safety not performance, above sea level is what really matters from a performance issue.
Re:Endurance (Score:5, Insightful)
Not quite. That was an test of the new parachute system that is designed for catastrophic situations, something any sane test pilot is going to want before climbing on board and soaring more than a couple feet off the ground. Not sure they discussed flight duration, but soaring to 3000 feet and back to the ground under it's own power is certainly a minimum flight time.
All the way from Darwin? (Score:5, Funny)
Darwin is pretty far away from Christchurch. I guess they could get someone from there to volunteer, but I doubt anyone who has won some prestigious award would be into it.
Hell, Google Maps [google.com.au] can't even figure out how to get there!
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It'll go even further than Tokyo using that kayak route if you let it. For instance, try New York to Sydney, Australia :)
landing. (Score:2)
Everytime you jump from a building you realize that the flying is not the problem, but the landing is the thing you have to worry about.
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Only the first time. If you manage to figure it out before you make it to the bottom, you can apply that solution to all subsequent jumps.
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I missed the 800fpm bit, but according to their site, the design is an part103-compliant ultralight which requires no license (though Martin will require a training program when they start selling them), Fuel capacity is 5gal (by FAA requirement) / 30min / ~30mi range.
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dude... You not only missed the joke but missed the math.
5000 ft - 4990 ft = 10 ft
10 ft ~= 3 mts
You guys made me laugh though, so it's all good ;)
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Shorter Video (Score:2)
Not really a jetpack (Score:3, Interesting)
A jetpack should be no bigger than a hiker's backpack. This thing is more like a small aircraft.
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I think letting pseudo-sci-fi action flicks to set technology and engineering guidelines is neither sane nor practical.
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I think letting pseudo-sci-fi action flicks to set technology and engineering guidelines is neither sane nor practical.
This [davidszondy.com] is a jet pack. It was developed by Bell Helicopters in the late 60's.Since there seems to be little information on the power plant it's difficult to critique the system. This design was prior to the T-400 jet engine that is used on the Blackhawk helicopter. I believe the T-400 would be a better power plant.
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The Bell Rocket Belt [wikipedia.org] used hydrogen peroxide as it's fuel for the 'flight', which typically lasted about 20 seconds, a helicopter engine is very much a different beast altogether. Its best known use was in a James Bond movie 'Thunderball' and as a halftime act for at 60's Superbowl. The fuel was so volatile that each launch took special preparation. Not that long ago there was still a stunt man who had built one which had a limit of 30 seconds, but it's easy to see why it would never be practical for any
Re:Not really a jetpack (Score:5, Insightful)
Look at your smart-phone. Did it *start* that size?
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Apples and oranges. When portable phones were invented, the electronics in them were nowhere near their theoretical size limits. They had room to both shrink and grow in performance.
Jetpacks like this are already very near their theoretical limits just to fly at all. There's no magical chemical fuel waiting in the wings. (Excuse the pun.) There's no magical ducted fan or propeller design that will dramatically increase performance. There's no magical material that will dramatically decrease the weight.
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There's no magical chemical fuel waiting in the wings. (Excuse the pun.) There's no magical ducted fan or propeller design that will dramatically increase performance. There's no magical material that will dramatically decrease the weight. Etc... etc...
I'm curious... how do you know there isn't?
There are a lot of discoveries that have already been made that do exactly what you said. The ducted fan design can be improved... GE is working on several designs that do exactly that. There are materials that do dramatically decrease weight... Carbon Fiber is an example... and the science behind those materials (and others) is continuing on. Don't underestimate the power of the imagination to think things up. If someone sees a problem, an engineer somewh
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And we're nowhere near that limit. Using Frink [futureboy.us]:
535lbs gravity 5000ft -> gal gasoline = 0.0259...
Even assuming 25% efficiency, it's still about 1/10 of a US gallon of gas. (the 200hp Martin engine burns 10gal/hr, so it could be as much as 38% efficient, but the transmission, fans and est.90% throttle pull that figure down.) The actual gas burned, though, to get to 5000 ft was likely about an order of magnitude greater. (~4000ft/800fpm=5min; 10gph*1/12hr=5/6gal)
The energy mostly goes not to lifting the cra
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it could be as much as 38% efficient
Two stroke engines don't run anything close to that efficiency, and the more highly stressed they are, the more unburned oil you mix into the fuel for lubrication.
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The energy mostly goes not to lifting the craft from one height to another but rather to accelerating air simply to maintain altitude.
Right, afaict jetpack implies small nozzles which implies high exhaust velocities which implies most of the energy ends up accelerating air downwards rather than accelerating the craft upwards (momentum is proportional to MV while kenetic energy is proportional to MV^2).
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Same AC here. I got that bass ackwards didn't I. If 5 gallons gives you 45 minutes of engine time then the engine is burning 6.67 gallons per hour.
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According to the Martin Jetpack website, 5 gal gives 30 minutes, which is 10 gal./hr. I'm not sure where the 45 minutes came from - a larger tank on the test craft or just an optimistic early estimate would be my guess, but it's possible that the efficiency was better than they hoped and they just haven't updated their site.
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Yes, you are right. It says 10 gal/hr right there on their website. I doubt you'd want to fly it until the fuel exhausted though. Repacking the parachute is a pain.
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Because I actually pay attention to and have a working understanding of engineering, physics, and chemistry.
They key words of course being "have already been made". Yeah, GE may be wor
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Nuclear.
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Holy shit. I never realized I was supposed to be so completely offended by the phrase "no pun intended."
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The jetpack produces ~600 lbs. thrust at 10 gph = 61lbs/hr.. Empty weight is 250lbs, max takeoff weight is about 535lbs.. A 180lb pilot could carry over 15gal of fuel, sufficient for 90 minutes of flight. The excess thrust over takeoff weight ensures a rapid climb and a decent forward velocity.
The test did not start at high altitude, but on the Christchurch plain in South Island, NZ which slopes gently from 30ft to 1900ft over about 20 to 35 miles. The test takeoff was likely at less than 1000ft, and the cr
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He clearly said in the video that it was at 3500 feet which was 5000 feet above sea level. So they started around 1500 feet above sea level. I wouldn't knock the guy for ONLY flying up 3500 feet.
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Baby steps.
They miniaturized jet engines enough to do this and it seems pretty damn good now. Maybe if you can get an engineering degree in fluid dynamics and one in materials science you can develop a continuous detonation wave engine that would be smaller.
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Strap a couple of those miniature jet engines (you'll probably need four for your weight, their weight, and a decent amount of fuel) to your back side, and if you don't burn your legs off, you'll at least start a brush fire. As simple as you make the concept out to be, the reason no one has ever bothered to do that is because no one has figured out a way to resolve the problem of exhaust temperature.
Meanwhile a large ducted fan means significantly lesser power requirement, and similarly, significantly less
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There are three factors you have to consider when building something like this: thrust to weight, thrust to power, and jet temperature. Your thrust to weight needs to be above unity, for obvious reasons. The most efficient way to achieve that thrust is a very large fan, at a very low flow velocity. As you try to shrink the unit, your fan becomes smaller, you need higher and higher flow velocity to achieve the same thrust. As you trade size for power, you go from reciprocating ducted fan, to high bypass
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A jetpack should be no bigger than a hiker's backpack and spit flame. This thing is more like a small aircraft.
There fixed that for you.
They should add a wing (Score:4, Interesting)
The pack is big and bulky enough that the addition of a small wing won't make much of a difference. With a wing, you can transition from vertical takeoff using thrust only, to horizontal wing-borne flight which uses much less power (and/or achieves a much higher speed).
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My thoughts exactly. Even helicopters and VTOL airplanes spend as little time as possible hovering or in straight vertical motion, both because of how fast it burns fuel and because most (all?) aircraft are more stable when moving horizontally.
Having a wing capable of providing enough lift for an unpowered decent and landing would also make the parachute the last resort that it should be. With the current configuration, the only solution for running out of fuel in flight is deploying the chute. While the la
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Now, if they had small wings (a la Buzz Lightyear) that could provide some lift, then the fuel n
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I think it should have a folding ultralight wing. That is hard to do but with the small size it should be doable. Then it won't be contributing so much drag during non-wing-based flight. Plus you could ditch it if you had to.
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You're right - a small wing won't make difference, so it's stupid to add one. To get a weight/sq ft ratio low enough for any kind of performance is going to require a fairly large wing. The Rocket Man requires an eight foot wing just to *glide* - and he and his pack are almost certainly lighter (or very close to) the dry weight of just the [Martin] jet pack all by itself.
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...big and bulky enough that the addition of a small wing won't make much of a difference...
Actually, that's not true. They are designing it to fit within the US Ultralight category. By adding a wing, you're adding weight, however he is only allowed 254 lbs. The craft is already at 250 lbs. As for speed... again, he is limited to 60mph due to the same restrictions... which he can easily achieve without the addition of a secondary lift device.
Bill
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If you're considering a wing, why not an autogyrating rotor?
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"Just remember, John - no matter what, don't look up, okay?" ~
After the first twenty feet... (Score:4, Funny)
After the first twenty feet the ascension would be much easier as my bladder and bowels empty out, lightening the load...
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making the weather forecast a light sprinkle with a chance of turds?
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Unless you're planning to forgo pants for the flight all this will achieve is a slight offset to the center of mass.
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Please put in consideration some people's fart power... I bet some people could do without a jetpack altogether :)
Jetpack or Personal Helicopter (Score:3)
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The "jet" is the plume of air rushing out of the engine that provides thrust.
A rocket is as much of a jet as a turbojet is, except that the rocket generates the jet using internal propellant only, whereas a turbojet, turbofan, etc. use the fuel to power machinery to push some of the surrounding air to form the jet.
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Or possibly a ducted fan... It really depends on the construction of the device. If the outlet is smaller than the rotor's swept area, that suggests compression of the air is involved and it would be a jet. If there's no compression, it would be a rotary wing with a cowling (possibly to reduce wing tip vortices), known as a ducted fan. Disclaimer: I am not an aeronautical engineer.
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Actually ducted fans are jets. The term jet simply refers to an entrained flow inside a surrounding medium. Ducted fans produce jets with a rotor in a cowling. Pumpjets produce jets with an impeller in a cowling. Rivers produce jets as they flow into the ocean. Your garden hose produces a jet when you open the valve.
A turbojet is one specific type of jet produced by the exhaust of a gas turbine engine. A turbofan is another type of jet produced by shaft output of a gas turbine engine powering a ducted
Military uses (Score:3)
Despite Martin Jetpack's talk of its usefulness for remote search and rescue, the real money is for military purposes. This piece [historynet.com] describes the first practical uses of helicopters in Korea for reconnaissance, supply, and medivac. A decade later, the next generation of choppers -- Chinooks and Hueys -- were doing serious delivery work in combat.
I, for one, welcome our new kiwi jetpack flying overlords.
Skeet (Score:2)
I think yesterday's installment of Schlock Mercenary [schlockmercenary.com] is apropos regarding the military use of jetpacks.
Interesting Procedure (Score:2)
Personally, I would have performed that test quite a bit beforehand.
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Actually you can't test the parachute beforehand..... because the test was for rocket deployment, at altitude, from a machine that was recently operating... anything less (even tossing it from an airplane and triggering the parachute) would be considered only a partial test in aerospace circles.
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and it was unmanned. I will say that the ride down didn't look like a lot of fun. Well better than the alternative might be but...
Must...control...credit card... (Score:2)
Maybe I can get a FEMA grant for one for Search & Rescue. Probably cheaper than a Robinson heli. (Yes, I know you can't pick up search subjects but you can't do that in a two-place Robinson either).
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I wouldn't want to risk an extraction. That's what our Back Country ground units are best at. This would be more for spotting from the air. Here in my county in Arizona, we have 8000 square miles and much of that is undeveloped land, designated wilderness areas, National Forest land, etc. I've thought about getting one of those powered paragliders. Probably much cheaper but not nearly as badass.
Flying Kiwi? (Score:2)
Of course a Kiwi can fly!
http://www.youtube.com/watch?v=sdUUx5FdySs [youtube.com]
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What are feet? (Score:2)
Really where is the metric whiners complaining about them using the term feet? Oh because it was a NZ newscast and a NZ citizen using them?
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As a NZer myself, we don't use "feet" as a measurement except, oddly enough, when referring to altitude. Not sure why. Perhaps to remain standard around the world in aviation circles. When in an aeroplane, 30,000ft seems a lot less scary than 10,000m, which my mind instantly translates to "10km".
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Why do find 10km scary. To me is is comforting but not as much as 30,000ft which I round to six miles up. In aviation speed is life, altitude is life. Thing only really suck when you run out of one or both of them.
But 30,000 ft isn't really 10,000 meters or even six miles. You see people as a whole are not too dumb to translate between system on the fly for things like news stories. The only time people should bent is when dealing with technical documentation.
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Cause it's an avation story and feet is pretty much the global standard (for better or worse).
I'm in a metric country (Australia) and I think in metric for everything. In fact I barely know what most imperial/US measurements even are. This normally includes altitude - I think in metres for altitude above sea level on land (i.e. I know my house is 576m above sea level, and the summit of a nearby mountain is at 880m). When hiking I have a pretty good feel for how far I have ascended or decended, in metres. Et
The trouble with jetpacks (Score:2)
The basic trouble with jetpacks is that knees are terrible landing gear. You have to land vertically with a huge mass to stop, and you can't do a controlled fall like a parachute landing. Achieving altitude is not the problem. Landing is the problem.
This thing, like the Solotrek, has landing skids, which take the landing shock. But then it's not really a jetpack. It's more like the Williams X-Jet Flying Platform [wikipedia.org] from the 1980s, probably the best flying machine in this category.
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Every landing I've seen was like feather.
That's because you're looking at really good pilots, in really good shape, flying under near ideal conditions, being very careful. Even with that, one test pilot has had six knee injuries. [popularmechanics.com] Just walking downstairs with 170 pounds on your back is tough.
It is not a jet, it is a ducted fan (Score:2)
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Who keeps the Metric System down?
So to answer GP's question, the aviation industry.
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We dooo, we dooo!
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Not exactly world wide [wikipedia.org].
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Re:To hear the Kiwi version of events. . . (Score:4, Informative)
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Although the Wright Brothers first few flights were primarily about flying in a straight line. I wasn't until their third flyer that they managed what could reasonably be considered sustained controlled powered flight (No disrespect to The Wright Brothers. A much more important first.)
Richard Pearse (the kiwi being referred to) did mange to get off the ground for short hops, so it's reasonable to consider that an
Re:To hear the Kiwi version of events. . . (Score:4, Informative)
You are mostly correct, though you didn't mention the key word: control system. The patent that the Wright Brothers file was not for the shape of the plane, or the engine they used, but for the control systems that let them control the pitch, yaw, and roll of the aircraft. Indeed, controlling the aircraft in stable flight by defining parameters like pitch, yaw, and roll was a key insight of theirs. All their competitors weren't able to achieve stable flight because they were still guessing their way around how to keep their aircraft up and steady, and didn't really have a solution that let them control the aircraft.