Questions tagged [experimental-aircraft]

For questions about experimental aircraft that have not been granted a type certificate by a regulatory agency.

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Did the Nazis ever have a pulse jet hovercraft?

I recently read an article about experimental aircraft Nazis had made during WW2. And one aircraft caught my attention.It was a experimental aircraft Named “Die Glocke” It was first described by a ...
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5 votes
0 answers
117 views

Why isn't Yamaha EPeX300Ti more popular in aviation?

The answer to this question might be obvious to experienced aviators. But as an armchair enthusiast, I really couldn't find a satisfactory answer anywhere on the internet. Below two pages came from ...
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4 votes
2 answers
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Besides forward swept wings, which are the other most unstable wing configurations?

I know that forward swept wings are unstable and all, and that's one of the reasons they aren't vastly used in planes in general. However, I would like to know more about other types of wing ...
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1 answer
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Is an aircraft considered experimental if built when having A&P licence?

I got my Airframe and Powerplant while in the Army 20 years ago, never used it after I got out. If I built an aircraft from scratch would it be considered amature experimental?
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10 votes
1 answer
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Why does the X-3 have two oil pressure gauges per engine?

The X-3, as currently in the National Museum of the US Air Force, has two oil pressure gauges per engine, and one fuel pressure gauge per engine. One of the per-engine oil pressure gauges is labeled ...
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9 votes
1 answer
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Strange airspeed indicator in the Douglas X-3 Stiletto

The cockpit of the Douglas X-3 Stiletto has a rather weird looking airspeed indicator. (The leftmost instrument in the top row.) Two concentric circular scales, the outer one goes from 0 to 20, the ...
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  • 718
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3 answers
254 views

What is the AeroVironment Helios' Kármán line?

If it's true that the NASA/AeroVironment Helios maintained level flight 96,000 ft above sea level at a maximum airspeed of 23.5 kts (43.5 km/h) I assume it must have a very high Kármán altitude, the ...
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35 votes
1 answer
5k views

What is this 3-engine beast?

What is this 3-engine beast? It has an unusual 6-bladed propeller as well.
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10 votes
1 answer
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What does it mean exactly when an aircraft is "35% unstable"? (aircraft stability factor)

CNN's Grumman X-29: The impossible fighter jet with inverted wings contains several interesting photos, and says: It was unflyable -- literally -- without a digital flight computer on board, which ...
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1 vote
2 answers
280 views

What are the effects of placing the vertical stabilizer at the front of the aircraft? [duplicate]

I am experimenting with different aircraft designs. The one I am trying right now is a canard (horizontal stabilizer at the front) and the main wings are quite far back. I wondered if it would be of ...
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3 votes
1 answer
223 views

Does/did Russia or the Soviet Union ever fly rocket planes?

Did Russia or the Soviet Union ever have their own experimental or military rocket planes (other than the Buran), or did their military merely use jets and other non-rocket aircraft? America flew ...
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3 answers
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Can air-to-air refueling be done in compliance with the FAR's?

I am wondering if any FAR's would prohibit the air-to-air refueling of two civilian aircraft in the US. In our use case, the receiving aircraft would be custom-built, and it would receive fuel pumped ...
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2 votes
1 answer
225 views

How are composite aircraft canopies constructed that sit flush with the fuselage?

More specifically, how is the composite frame of the canopy manufactured? Attached picture as an example.
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2 votes
1 answer
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Does anyone know more about the 1958 Heinkel-211 project?

Industria Aeronáutica Argentina worked in the 50s in a Jet airliner, Kurt Tank design, the IA-36, 'Cóndor', with simmilarities to 1958 Heinkel-211 project, turbines intake aspirating fuselage boundary ...
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1 vote
1 answer
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What about a Plane-Train?

The Shanghai Maglev Train's max speed is 267 mph. Could a plane be made to follow a rail, surface area provided, if not an existing rail to travel along? How much faster could the heavily modified ...
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2 votes
1 answer
165 views

Could a wing be designed to exploit both normal flying and ground effect?

Ground Effect planes' wings are stubby and the height over the ground or water is limited to wing span. Could a wing be designed to exploit both normal flying and ground effect together to give the ...
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3 votes
3 answers
562 views

Is it feasible to replace a C152's engine with multiple small turbine engines?

If I wanted to remove the piston engine from a cheap plane like a Cessna 152 and add small turbine engines with an equivalent thrust but weighing less, where would be the best place structurally to ...
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1 vote
1 answer
330 views

Any idea what this Ampaire plane is?

(Source) This is certainly not the Ampaire 337 or Electric EEL, which is a converted Cessna 337. It looks like a boundary layer ingestor. Being from Ampaire, it probably is electric or hybrid. I've ...
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How is NASA going to get high fuel economy on the X-57? [duplicate]

This X-plane is meant to fly soon. It's a modified Tecnam. The propeller direct wash over the wings, increasing lift. This allows the use of a smaller, high-aspect ratio, low drag wing. But this isn'...
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1 vote
3 answers
497 views

The NASA X-57 uses 12 electric motors for takeoff. Does it need 12 control levers or just one?

If the NASA X-57 uses 12 motors for takeoff, does it need 12 controllers (like throttle levers), or just one? The traditional way of engine throttle design was 1 throttle per engine, but what if you ...
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20 votes
1 answer
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What is the asymmetric feature on the rear of a Sukhoi Su-47?

I saw this part on the rear of the Sukhoi Su-47 Berkut, and I can see that it is asymmetric. Is it maybe for interference, or is it a take-off aid because the Su-47 is a STOL plane? What is it and ...
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3 votes
3 answers
2k views

What are the disadvantages of a Tail providing lift? (tandem-wings included)

Most aircraft feature the tailplane configuration, which requires the main wing to provide higher lift than the weight of the plane itself, what seems counterproductive. Few aircraft have featured ...
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1 vote
1 answer
287 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 ...
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4 votes
1 answer
365 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 ...
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32 votes
5 answers
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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, ...
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0 answers
189 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 ...
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1 vote
0 answers
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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 ...
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3 votes
0 answers
107 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 ...
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4 votes
1 answer
617 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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1 vote
3 answers
453 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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-1 votes
2 answers
937 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 ...
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10 votes
1 answer
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?
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9 votes
1 answer
5k 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?
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2 votes
1 answer
549 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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-2 votes
2 answers
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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 ...
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0 votes
5 answers
704 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 ...
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6 votes
2 answers
442 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 ...
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1 vote
1 answer
173 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 ...
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8 votes
1 answer
437 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 ...
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3 votes
2 answers
129 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.
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2 votes
1 answer
379 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.
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8 votes
3 answers
3k 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 ...
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2 votes
3 answers
952 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 ...
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0 votes
1 answer
616 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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0 votes
1 answer
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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 ...
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5 votes
2 answers
877 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 ...
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2 votes
1 answer
359 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?
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5 votes
1 answer
2k 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. ...
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0 votes
0 answers
179 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 ...
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1 vote
2 answers
1k 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 ...
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