NASA Five Person VTOL Business Jet
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- Опубликовано: 24 авг 2024
- VTOL business jet that utilizes circulation control nacelle technology, along with a damped brake nacelle tilting mechanism. The use of circulation control on the nacelle permits variable disc loading depending on whether the aircraft is in hover or cruise flight. This concept is based on the work performed collaboratively between NASA and Grumman on the Tilt Nacelle 698 concept back in the 1980's under the leadership of Bob Kress.
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wow! handles like a dream!
those little red animated arrows must make all of the difference!
Not really a jet but a ducted fan plane. I like the design.
Yes, I agree. There are real challenges with this propulsion system. Metis is doing some exciting work on tip driven warm gas generators - perhaps if they can show a breakthrough at the propulsion level, then more feasible integration solutions can be looked at.
The MGGF (multi gas generator fan) was developed and analyzed by Mdot Aerosapce - I don't know who Lim is, but would like that paper reference. Not a good description - there are multiple small turbines that produce hot gas as a product (not shaft power). This hot gas enters a scroll around the fan, and exhausts through a tip turbine (which is connected to the main fan). So the MGGs provide redundant hot gas to the tip turbine fan, without any gearboxes.
While this is a cartoon concept, we did have specific technology component development taking place - which is why we wanted to at least understand how the different technologies would fit together into a feasible vehicle. So this vehicle was more about looking at how to use circulation control nacelles that utilize distributed propulsors, than about achieving an optimal integrated solution with ideal tails, etc. Thanks for your suggestion of improvements.
This is awesome, I hope this becomes the new norm in VTOL Business Jets soon...
Instablaster.
There are no driveshafts, this concept was built around a new type of propulsion system called a Multi-Gas Generator System. There are 5 small turbines around the nacelle that feed a common scroll exhaust (that then turns the fan and then exhausts into the flow). This propulsion system was specifically developed for VTOL aircraft to decrease the huge single engine inoperative penalties, and avoid cross-shafting and gearboxes. But without an explanation, I understand your confusion.
NASAPAV
I don't think you understand that the thrust comes from mass flow through a rotor (or duct) as well as the velocity of the air through it. A smaller diameter duct has a higher air velocity (which is why is requires more power). Helicopters have low discloadings, with low velocities and high mass flow - ducted propulsors have higher discloadings with lower mass flow and higher velocities - but the thrust can be the same (with more power required for the system that must move the air faster.
Reminds me of something like a tip-jet rotorcraft, but instead of a rotor the reaction forces drives a ducted fan. And then you add the complexity of something like the Osprey tilt-rotor to that...
Would be interesting to see if anyone could pull it off past the conceptual phase.
It is very much like my design . however my design can do all three this is only air capable . You wanna see a really cool design that integrates all three vehicle configurations into one give me a crew a lot of money and some time I'll show you a real dual-ducted fan triphibious vehicle that is 100% green and really quiet . I like the directional vanes downstream from the ducts they allow for Yaw and pitch corrections , very nice . Cool design
There are 5 motors on each side (gas generators), so that if one fails- there is still plenty of power to keep the vehicle aloft. However, if the fan failed on either side, you are correct - the vehicle would crash. But a fan failure in a protective shroud would be an incredibly rare event, especially during the 30 seconds of transition flight.
The problem is, the motor or engine with enough power to lift this off the ground is still in the drawing board
this is some black ops 2 technology
No, roll control is through change in the fan pitch - not acceleration. The rate of roll is an angular acceleration, which is determined by how much excess thrust is available at each engine through the change in pitch (and increase in power required). The response rate of variable pitch is very fast. I think it may help if you read some helicopter performance and dynamics books, as I think you are confused on this subject.
Yes, but the 5 gas generators don't provide ADDITIONAL power, they provide ALL the power for the fan. The fan is only driven by the tip turbine that is around the outside of the fan, with the tip turbine being driven by the hot gases of the redundant small multi gas generators. All the thrust of the vehicle comes from the fan, the residual thrust of the hot gases coming out of the tip turbine is inconsequential.
OK, two different turbines involved here. There are 4 to 5 small 'turbine' engines that are only producing hot gas - composed of a turbine that is extracting ONLY enough power to turn the compressor (and does not extract any power). The hot gases produced by these 'turbines' are used to turn a single large turbine that is directly attached to the fan (at the tip of the fan). This large 'turbine' extracts power from the hot gases to turn the fan. Unfortunately tip turbines are low efficiency
No, not quite... Yes, ducted props have more blades that are more highly loaded (because the blades can now support a tip load), but most ducted props will have variable pitch systems for thrust modulations - they don't increase or decrease the rpm. Heli's don't have a lot of 'acceleration', they have lots of mass flow - the thrust you get is a product of the mass flow and the velocity of that mass flow. So ducted props have higher velocities, which means more power (for a very short time).
I can see this being adapted for rapid medical evac for long or short transports.
Here's were they say we can start to have things like this in 2030 instead of just getting them straight out there.
Very good ideas!
Wow! Very impressive, simple, and not much to go wrong with this old design that I like more than even the new designs and concepts. And why should we use batteries right now instead of an engine (buffered to reduce or eliminate a detectable sound to communities) to generate electrical power for this amazing VTOL craft for civilian use?
@NASAPAV Well in these cases to recover from a total failure you could simply install and require recovery chutes. Its been around for years in small aircraft and even saved some lives. Beats the hell out of being dead.
You should design a car that has the same concept but I looks more like a car but when it needs to fly the wheels will turn to thrusters to. Kind of like the back to the future car
Totally understand your sentiment - it is a reasonable perspective. However, you should watch Ken Burn's "Horatio's Drive" (free download on Netflix). Exactly the same arguments existed in 1903 regarding the future feasibility of the automobile - it was just a rich man's toy - and was a poor one at that. Horatio's Drive tells the story of a bet to be the first person to drive across the U.S. in an automobile - it's really worth watching.
What are those red arrows?
I think this already exists in the movie Avatar? So I don't see what NASA did that was new in this animation.
I like those very much but I think I feel little disagree about blade system..
Why not put blade on end join to round thingy.. to keep blade stable while spin?
Just a thought of idea/ suggest
I'm so proud. Obama paid Russia $82 million each for taking our astronauts to the space station, for 8 years. But at least there are some kids at NASA that can use X-Plane to simulate an aircraft.
Brilliant!
Great concept,I would design the ducted fan naecells to 'Tilt' without the extra weight & stuff hanging out making more drag,also the 'Tail' I would design a 'Fish-Tail' type for weight saving also would reduce drag & weight as direction would be wholly on the rotation of the Drive fan units,also the wings haveing aelerons/trim tabs for stable flight control at high speed.
Are there 'Prototypes' that have been manyfactured for 'Proof of Concept' or is this still in the fantasy stage of R & D now
i don't get it, what's with that red flow that seems to be coming from the inside of the fan shroud? maybe it isn't really from the shroud itself, something to do with the coanda effect then? and correct me i'm wrong, but at first glance i would also say that coupling those driveshafts with variable geometry fans seems mighty complicated and prone to failure. really cool concept otherwise.
This looks like a much smaller version of an osprey
Almost there guys, this idea has been around since the late 50's im afraid. However with the Vietnam war the Helicopter was the winning concept and ducted fans never took off unfortunately. Why no one will duct a rotor is beyond me. The idea has been promoted even in movies and is frankly a sound concept. The movie AVATAR and their method of propulsion, the helicopter type or dual ducted rotor type of aircraft is the way to go here. It will work!
Coming in 4 years late with this, but your proof of concept is your downfall: movies. Movies bend the laws of physics, reality, and practicality to their will, in no way does that reflect how it will perform in actuality. That is a poor choice of example right there.
its like your flying and someone calls the airforce for a U.F.O and shoots ya down lol
Then it would be just like a conventional helecopter. The point of tiltrotor technology is speed. If they didn't tilt the jets, this plane might reach 170 mph max, but if they tilit into a convetional aircraft style, it could reach speed between 450 and 500 mph. Thus allowing the plane to travel greater distances without having to refuel.
I know VTOL bizz-jets are not really practical (cos of the high cost) but you would think some rich people would want them (like in Dubai). Hawker Harrier were going to make a bizz-jet based on the Harrier, but it was scrapped too. They barely make them for the military, so they must be hard to make, but bizz jets don't carry heavy arrns. 2-4 seats is enough. They may be expensive but they would be good in Dubai where they could afford them. The eighteenth richest person in the world built a two-billion dollar house. Wouldn't he be able to afford to get a VTOL bizz jet made?
Why animation's only? Where is a working prototype? If no, this looks like an idea, nothing more.
All ideas begin with drawings. If you have $5 million you could build one.
How are those blades turning I dont see any drive shaft or motor?
Very good and nice $$$$$
Reminds me of the Hunter Killers from The Terminator.
Greets from "Avatar" ;)
This has been Clutch Cargos.
@NASAPAV oh, now i see. very clever
nice concept, be great if it were electric rather then dirty fuel aircraft!?
use hydrogen
Looks more like a turboprop than a jet...
good luck!
A ducted fan, however fancy in it's controls, isn't a jet. There's no combustion to produce thrust. Not a "jet".
Just to add: the whole VTOL business air vehicle/personal air vehicle is really problematic. How many folks here, even if they were well-off enough to afford one, would really be able to fly one to work, or wherever, without having to find a place to land the thing where there's enough parking space, roof access or whatever, lack of trees, etc.- which wouldn't end up being nearly as inconvenient (and certainly no less expensive) to use and get from as just driving to work in the first place was?
Flying example pls
@halcyon0830 Same reason it can't be a flying boat...because it just isn't one, it's something else.
like diameter
What do you think the cost of the aircraft will be
wouldnt it make it less efficient to have to tilt the fans or props not sure which they are on this but couldn't you just tilt the little red rudder thing like so the wind bounces off it and pushes it forward haha (make two of them or that one longer )just saying save some energy there haha work smarter not harded
#accesstoenergy
#navigationalfacilities
Why "jet"? Those are ducted fans...
if one of motor fail...R.I.P
what of music?
9ice...
Where's the fuel at??
guys its my jet sorry XD
WHY CAN'T THIS BE A VTOL FLYING CAR.
Where can I get one?!
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That is not a jet... Is a propel plane... god, learn the difference
Not a jet. It's a ducted fan. Talk to me when you have a working prototype. I hate these computer rendered aircraft. You can make anything work in CGI - just ask the movie special effects folks.
Looks Cheap to buy for a family of 5