Questions tagged [experimental-aircraft]
For questions about experimental aircraft that have not been granted a type certificate by a regulatory agency.
72
questions
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1answer
157 views
Are there any NACA airfoils that resemble the X-29's wing?
As a part of my project, I am trying to perform structural and aerodynamic analysis of a forward swept wing on an aircraft, specifically the Grumman X-29 (pictured below).
I am assuming that ...
3
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1answer
240 views
Would “Mad” Mike Hughes' steam-powered rocket have been certified airworthy by the FAA?
Daredevil 'Mad' Mike Hughes died after his homemade rocket crashed on 22 February 2020. The cause appears to be the premature deployment of the parachute used for a safe return. He was hoping to reach ...
31
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5answers
10k views
Why Didn't the USSR Build An X-15?
In the history of aerospace engineering in the United States, the X-15 is lauded as a critical and necessary step on the path to manned spaceflight. Throttle-able chemical rocket propulsion systems, ...
0
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0answers
66 views
Does a 3-blade prop handle up/down drafts better than a 2-blade?
I'm about to order a plane kit (RV-10) and one of the choices I'll be making is a 3-blade vs 2-blade propeller. A 3-blade prop should be: easier to balance, quieter and capable of generating more ...
0
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0answers
34 views
Can an aircraft be issued a standard airworthiness certificate after being operated under and experimental certificate?
14 CFR, §21.191 (b) states that experimental airworthiness certificates can be used when:
Showing compliance with regulations. Conducting flight tests and other operations to show compliance with ...
3
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0answers
88 views
What were the typical rotation and landing speeds of the X-29?
Looking online through all the available literature, I could not find the typical rotation ($V_r$), landing or even stall speed of the experimental forward swept wing X-29 aircraft.
I'm curious to ...
4
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1answer
217 views
Are there experimental aircraft regulations in Germany?
The title is the question.
Are there any special regulations regarding experimental aircraft in Germany (or the EU)?
Those "special regulations" would (hopefully) be looser set of regulations in ...
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3answers
304 views
Can a gas turbine be able to switch from torque to thrust?
Can a turbine engine be switched from providing torque (like a helicopter) to the rotor to transfer power to provide exhaust thrust (like a jet plane)?
Related: BV-347 upgrade this way?
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2answers
410 views
Could a BV-347 be upgraded by extending the wings?
The CH-47 Model 347, also referenced as BV-347, was a helicopter that utilized a wing for forward flight and to carry external payloads. Could the wings be extended and engines on the rear rotor ...
10
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1answer
3k views
What kind of Chinook helicopter/airplane hybrid is this?
I had this question: Could this helicopter's body be a flying wing? and this picture came up.
What kind of helicopter is this?
What is the extra wing for?
9
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1answer
4k views
Why did the AvroCar fail to fly above 3 feet?
I don’t quite understand why the AvroCar didn’t reach more than 3 feet? Was it a ground effect keeping it at that height and it didn’t have the capability to fly higher?
2
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1answer
439 views
Could this helicopter's body be a flying wing?
This question: Could a helicopter fly like a plane this way? asks if a helicopter can turn sideways using additional wings to tip forward to allow the rotor blades to act as a propeller. The tail-...
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2answers
141 views
Would a long pole help stablize a jet pack?
Jet packs are classically worn like a book-bag on the back. Would it be more stable if the exhaust ports were separated? Would the jet pack be easier to control if the turbines were at the ends of a ...
0
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5answers
563 views
Could a helicopter fly like a plane this way?
Could a wing be added to a helicopter to allow the entire craft to tip 90 degrees forward allowing it to fly faster like a plane using a fixed wing and leaning into the wing for lift?
I understand ...
5
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2answers
377 views
Has a small airplane ever been air launched from a heavy-lift helicopter?
I would like to know if a small airplane, like a Cessna, has ever been air launched from a heavy-lift helicopter, perhaps as a stunt or as an aviation experiment?
I think it would have been a simple ...
1
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1answer
136 views
What rotors would be best for atmospheric reentry?
What rotor blade set up would be the best for entering Earth atmosphere or to shed speed before landing in place of a parachute?
I understand that the longer blades are more efficient, but are not as ...
8
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1answer
296 views
How are businesses able to use experimental aircraft?
I saw businesses like this using military jets to sell rides to civilians. Since warbirds are considered experimental aircraft, does the FAA issue special certs to fly them commercially?
According ...
3
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2answers
111 views
Where can you find wind tunnel visualization data online?
I was wondering if there was a repository of flow visualization results somewhere online, preferably of wing sections categorised in some manner.
2
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1answer
223 views
Has the FAA ever granted a LODA for compensated instruction in a non-LSA E-AB?
I have been trying to find a list of granted LODAs to get this question answered. No joy. I am considering purchasing a Sling TSI E-AB. It would be great to be able to instruct in it for compensation.
5
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1answer
2k views
Can an amateur-built aircraft ever be used for commercial activities?
There are some non-recreational activities, such as aerial photography, wildlife observation, environmental monitoring, etc., that seem well-suited to certain amateur-built aircraft. The open-cockpit ...
1
vote
3answers
638 views
Can a Rutan Quickie be made into a legal Part 103 Ultralight?
I was was thinking about buying a 80s rutan quickie q-1, it has a 18 hp motor. I want to get a ultralight but I like this one because it is fast. Can I get a motor that would be within the ...
0
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1answer
457 views
Why does the Aurora D8 have vents on the bottom of its fuselage?
The Aurora D8 is a concept of an experimental aircraft (not an actual aircraft for now), described in this site. It's discussed in this question here on Aviation.SX.
I was watching the embedded video ...
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1answer
166 views
Airfoils designed for reverse flow [duplicate]
This question might seem strange as almost all aircraft have the air flowing over the wing in only one direction. However if you wanted to design an airfoil would have a good L/D in the forward flow ...
5
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2answers
673 views
How can someone without a pilot's license arrange an initial test flight for a homebuilt aircraft?
I think this has more to do with culture and expectations than actual rules, so maybe this might attract opinionated answers, but I still want to know what people think:
If a person were to construct ...
2
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1answer
259 views
What are the FAA's requirements for an experimental type certificate?
What is required by the FAA to obtain an experimental type certificate for a manned prototype aircraft?
4
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1answer
975 views
Is it legal to rent out an experimental aircraft?
Is it legal to rent out an E-AB aircraft (not a light sport aircraft)?
The aircraft will not be used for hire or compensation but to rent out to a pilot who wants to fly from point A to point B.
...
0
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0answers
99 views
Can you own a fractional portion of a kitplane or experimental airplane?
I understand that experimental/kit planes can't be used for 'training for hire', i.e. an option of leasing them to flight schools is out. But... is it possible to own such aircraft on the fractional ...
0
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2answers
495 views
Could a blimp maneuver using a sail? [closed]
How do you build a sail for a blimp/hybrid airship and what would it look like? Similar to a sail boat how could a blimp maneuver without propellers? Can a blimp sail against the wind? Wind can travel ...
0
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0answers
151 views
Will the Honda CG 125 engine be able to lift a 200kg weight at 2100 RPM? [duplicate]
I found a Rotex company engine with a maximum RPM of 5800. However, company allows 70% mean 4000 RPM, so I'm sure that 2100 RPM will be enough for lifting or take off and be able to climb. I have ...
5
votes
1answer
467 views
What would be the effect of skinning over the gap in fixed leading-edge slats?
The Zenith STOL CH-750 experimental aircraft uses a modified NACA 650-18 airfoil (having a 17% fatter-than-normal thickness) with a fixed leading-edge slat. In an effort to reduce drag and improve ...
3
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1answer
1k views
Can I do an instrument rating checkride in an experimental aircraft?
The EAA has a document that strongly suggests that IFR operation in Experimental Aircraft is legal. The necessary equipment is described in 91.205. Provided all this is met, as well as all other IFR ...
5
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3answers
901 views
What are the factors required to estimate the minimum required power for an experimental aircraft of a specific mass?
I have already viewed these questions:
Basic aircraft performance: how can you calculate the required power?
How can I estimate the required T/O power for propeller aircraft?
But is there a ...
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4answers
695 views
Spinning wing heat dispersion dynamics for Mach 24 and beyond?
Could a spinning disk dropped from orbit survive speeds faster than conventional aircraft in our atmosphere? Does the rate of spin matter when dispersing heat? Does a spinning disk create stability ...
22
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1answer
1k views
What was enabling control to the pilot on the Snecma C-450 Coléoptère?
Looking at the Snecma C-450 Coléoptère, I was wondering about the (4?) fins towards its tail:
Source: Wikipedia
Were they able to pivot to help the pilot control the aircraft?
If not, what else ...
9
votes
3answers
722 views
Has anyone researched or built an aircraft that controls pitch and roll by pumping liquid within the airframe?
I am confident I have seen an article couple years ago about a "static surface aircraft" (or at least a concept of it) with no control surfaces, which uses a "wet mass" to adjust its roll and pitch.
...
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1answer
330 views
Are experimental aircraft exempted from the 2 year transponder and avionics checks?
Experimental aircraft and LAS. The 2 year verification test for avionics , transponder and altitude encoder. Are experimental aircraft exempted from this test or they must comply ?
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1answer
1k views
May I fly with passengers on a homebuilt experimental airplane with only a simple PPL?
So I’m in the market for a small two-seater. I see a lot of homebuilts and experimentals listed that are perfectly priced. I have my private pilot certificate but that’s it.
Would I be able to fly ...
7
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1answer
631 views
What is this Lockheed Martin plane?
It's on a Lockheed Martin banner showcasing the company's iconic planes. The plane to the left on a crimson background is the U2, and the plane to the right on a blue & tan background is the C130.
...
5
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1answer
793 views
How come there is no attempt at an “inter-meshing rotorprop” high-speed helicopter?
There are some prototypes of high-speed helicopters, such as the Eurocopter X³ (X-Cubed), Sykorsky X2, and older ones such as the AH-56 Cheyenne.
At high speeds, forward and backward traveling rotor ...
62
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2answers
10k views
What is this odd aircraft?
What is this aircraft? It was parked at transient parking at the Southern California Logistics Airport. It is a pusher prop driven plane with a conventional tail. High aspect ratio un-swept wings. ...
3
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2answers
1k views
If I were to scratch build a helicopter, as the manufacturer, would I need a pilot's license to fly it?
If I were to scratch build a helicopter, as the manufacturer, would I need a pilot's license to fly it while its in the experimental stage? This is in the USA, but I'd be interested in how it plays ...
6
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1answer
319 views
Which FAA regulations apply to the Stratolaunch?
(Image source)
Which FAA regulations apply to the Stratolaunch being built by Vulcan Aerospace and Scaled Composites?
Do they follow the same regulations for the type cert, production and CofA (...
7
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1answer
237 views
Can (part of) the fuel in your tanks be considered “property carried for compensation or hire”?
This question brings up that an experimental category aircraft cannot carry "persons or property for compensation or hire". However, this raises a question regarding civil-registry refueling tankers (...
asked Feb 22 '17 at 23:55
UnrecognizedFallingObject
12.2k3 gold badges28 silver badges96 bronze badges
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2answers
818 views
May a commercial pilot transport an owner in the latter’s experimental aircraft for compensation?
Say Olive Oyl owns an RV and wants to hire Popeye, a commercial pilot, to fly her to the beach in her aircraft, which has an experimental certificate. May Popeye legally accept compensation for this ...
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2answers
825 views
Could flywheel type gyros stablize a plane?
An aircraft carrier has massive spinning gyros to keep the ship upright against waves. Do planes of any type have gyros like those used in satellites? Not instrument gyros. In the picture below ...
3
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1answer
542 views
Why does the NASA GL-10 Greased Lightning run on diesel?
I've been reading about NASA's experimental GL-10 Greased Lightning tilt-wing aircraft with interest.
My understanding is that this is a diesel-electric hybrid aircraft uses stored electrical energy ...
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4answers
1k views
What is a blimp called if it is designed not to be lighter than air?
I have not found a name for a this type of vessel what class a vessel is it? Could it operate similar to a parasail if dropped from a high altitude or orbit with air far thinner then operational ...
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0answers
180 views
Is it technically feasible to dampen the control stick in an Autogyro?
The control stick in a gyrocopter is too wobbly for a glider pilot's liking. Is there a way to dampen the stick in a Gyrocopter [Eg. the Air command] to make it feel as smooth and light as one would ...
4
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2answers
606 views
Could the vertical stabilizer be removed on the NASA X-57?
I was reading this article about how NASA will develop this new X-57 X-plane which has many tiny electric motors mounted on the wing.
Now, I wonder: How come this aircraft still has a vertical ...
0
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1answer
409 views
What are the design goals for NASA's X-57? [duplicate]
There have obviously been work going on prior to the X-57 announcement (see LEAPTech and Joby Aviation http://www.jobyaviation.com/LEAPTech/). However, what does NASA actually think they will achieve ...
