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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Have two similarly sized aircraft ever hard-docked with each other while in flight?

This question is looking for a precedent in aviation related to the futuristic idea of maintaining a permanent fleet of solar-powered aircraft in the upper atmosphere on the sunny side of Venus (which ...
phil1008's user avatar
  • 161
2 votes
2 answers
410 views

Are Light Sport Aircraft: Certified, Experimental or a third separate category?

Is a Light Sport aircraft considered to be A certified or experimental aircraft? or is Light Sport a completely different third category?
Charles Bretana's user avatar
1 vote
2 answers
252 views

Using an experimental aircraft to carry patients for medical treatment?

I am interested in doing flights for organizations that connect pilots with patients. I am also interested in purchasing a Sling Tsi and I am wondering if those two things can be combined since it is ...
Tricio's user avatar
  • 11
5 votes
1 answer
356 views

Does the X-59 comply with the "area rule"?

The Lockheed Martin X-59 was rolled out yesterday :-) Brett Tingley, Watch NASA's sci-fi-looking X-59 'quiet' supersonic jet roll out of the hangar, August 2023. I am no expert here (and no English ...
Benur's user avatar
  • 53
7 votes
2 answers
864 views

What is the difference between a standard airworthiness and a experimental airworthiness certificate?

What is an experimental certificate? Is it just a certificate that is for aircraft that were built experimentally such as home-built aircraft? What is the purpose of the certificate?
youngpilot's user avatar
8 votes
1 answer
952 views

Are there any variable-diameter propellers?

Have there been any known tests or prototypes of variable-diameter propellers? There's this paywalled paper from 2014 that seems to have made a virtual prototype model, have there been any physical ...
user721108's user avatar
  • 4,653
4 votes
1 answer
226 views

Amending Operating Limitations for IFR operations

I own an experimental aircraft and have installed all the equipment necessary to fly under IFR. I found that there's a line on the Operating Limitations document that says "Day/Night VFR ...
Charles Bretana's user avatar
0 votes
0 answers
80 views

Sensors used on a blade

How to measure the strain, temperature and rotational dynamics on a running engine fan blade? How can you do the experiment?
user67835's user avatar
6 votes
1 answer
1k views

Are ex military airplanes experimental?

What makes a plane experimental, and why do all warbirds categorize as experimental aircraft?
Boeing787's user avatar
  • 6,384
33 votes
4 answers
5k views

Why was the skid landing gear located so far aft on the X-15?

The X-15 famously used a pair of steel skids as the main landing gear rather than conventional wheels, which saved weight, allowed the skids to be mounted externally (where wheels and tires would have ...
CameronSS's user avatar
  • 595
5 votes
2 answers
872 views

Why do experimental aircraft have such long tubes on the nose?

Why do experimental aircrafts (like the X-35, the Space Shuttle Enterprise, the H160 or the X-15 in the pictures) have such long Pitot tubes at the nose when compared to the production aircraft? Are ...
Jordan Goodman's user avatar
0 votes
1 answer
226 views

(UK) Why did Colin Furze's Hoverbike not require a licence?

Link: Why did he not need a licence to fly this?
Pipseycat's user avatar
1 vote
1 answer
274 views

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 ...
Leo's user avatar
  • 217
5 votes
0 answers
1k 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 ...
crow's user avatar
  • 51
5 votes
2 answers
474 views

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 ...
mandiokai's user avatar
  • 562
0 votes
1 answer
351 views

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?
drhunn's user avatar
  • 103
10 votes
1 answer
374 views

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 ...
tml's user avatar
  • 746
9 votes
1 answer
1k views

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 ...
tml's user avatar
  • 746
0 votes
3 answers
424 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 ...
Better not tell's user avatar
35 votes
1 answer
6k views

What is this 3-engine beast?

What is this 3-engine beast? It has an unusual 6-bladed propeller as well.
Tiger's user avatar
  • 991
10 votes
1 answer
476 views

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 ...
uhoh's user avatar
  • 5,808
1 vote
2 answers
627 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 ...
Vincent Cerowski's user avatar
4 votes
1 answer
301 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 ...
Giovanni's user avatar
  • 193
5 votes
3 answers
290 views

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 ...
varihard's user avatar
5 votes
1 answer
329 views

On video equipment used to help assemble the X-59

On 2020 Dec 14, NASA reported on Lockheed Martin's construction of the X-59. NASA’s supersonic X-59 assembly team marks wing milestone. The report's photos include an unexplained apparatus, ...
Camille Goudeseune's user avatar
2 votes
1 answer
388 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.
Mridul's user avatar
  • 1,232
3 votes
2 answers
375 views

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 ...
Urquiola's user avatar
  • 1,633
1 vote
1 answer
399 views

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 ...
Justintimeforfun's user avatar
2 votes
1 answer
182 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 ...
Justintimeforfun's user avatar
3 votes
3 answers
809 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 ...
Justintimeforfun's user avatar
1 vote
1 answer
442 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 ...
Abdullah is not an Amalekite's user avatar
1 vote
0 answers
41 views

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'...
Abdullah is not an Amalekite's user avatar
1 vote
3 answers
515 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 ...
Fred's user avatar
  • 1,059
20 votes
1 answer
5k views

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 ...
L'aviateur's user avatar
4 votes
3 answers
3k 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 ...
zaumo's user avatar
  • 55
1 vote
1 answer
477 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 ...
user avatar
4 votes
1 answer
441 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 ...
Party Ark's user avatar
  • 12.7k
33 votes
5 answers
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, ...
Bryson S.'s user avatar
  • 1,120
0 votes
0 answers
246 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 ...
Slawomir's user avatar
  • 101
1 vote
0 answers
225 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 ...
nodapic's user avatar
  • 1,817
3 votes
0 answers
128 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 ...
Paranoidone's user avatar
4 votes
1 answer
1k 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 ...
GittingGud's user avatar
1 vote
3 answers
555 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?
Muze's user avatar
  • 1
-1 votes
2 answers
2k 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 ...
Muze's user avatar
  • 1
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?
Muze's user avatar
  • 1
8 votes
1 answer
919 views

How does the X-59 achieve low-noise supersonic flight?

By what mechanism or combination of mechanisms does the X-59 reduce the noise produced by its sonic boom? What are the design choices that led to this outcome? I really want to understand the issue ...
Paul's user avatar
  • 262
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?
L3RCAN's user avatar
  • 93
2 votes
1 answer
606 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-...
Muze's user avatar
  • 1
-2 votes
2 answers
158 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 ...
Muze's user avatar
  • 1
0 votes
5 answers
864 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 ...
Muze's user avatar
  • 1