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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1 answer
136 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 ...
0 votes
1 answer
146 views

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

Link: Why did he not need a licence to fly this?
5 votes
6 answers
4k views

Why did the YF-23 never enter service?

The YF-23 was one of the most stealthy aircraft of all time and had a range capability of 2,000 miles (that's more than some airliners can travel) but never entered service. The F-22, has high ...
5 votes
0 answers
162 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 ...
10 votes
1 answer
198 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 ...
5 votes
2 answers
239 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 ...
0 votes
1 answer
129 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?
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 ...
0 votes
3 answers
257 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 ...
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 ...
11 votes
3 answers
22k views

What is the procedure to turn a certified aircraft into an experimental aircraft?

Last year at EAA Airventure I saw a helicopter (can't remember the model, but it was something like a Eurocopter EC135 or similar with a full glass cockpit). It was US registered (N-Number tail) but ...
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.
1 vote
1 answer
684 views

Are experimental aircraft exempted from the 2 year transponder and avionics checks?

Are experimental aircraft exempted from the 2 year verification test for avionics, transponder and altitude encoder? Or must they comply?
20 votes
1 answer
4k 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 ...
14 votes
4 answers
31k views

Why was the Sukhoi Su-47 Berkut never adopted for service?

This is a rather long question, since I try to cover the historical background which might not be widely known. If familiar with it, you can skip to the "highlighted sections". As part of the ...
10 votes
1 answer
322 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 ...
1 vote
2 answers
289 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 ...
3 votes
1 answer
225 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 ...
5 votes
3 answers
229 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 ...
3 votes
3 answers
581 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 ...
18 votes
4 answers
2k views

Was there any progress in ramjet-powered helicopters after 1960?

It seems in 1950's some countries investigated production of helicopters powered by ramjet engines on rotor tips - examples include American Hiller YH-32 Hornet or Polish JK-1 Trzmiel. The enthusiasm ...
2 votes
1 answer
238 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.
2 votes
1 answer
244 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 ...
2 votes
1 answer
166 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 ...
1 vote
1 answer
304 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 ...
1 vote
1 answer
333 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 ...
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'...
27 votes
2 answers
7k views

What is this red canister on the tail of the YF-22?

On the tail section of the YF-22 further back in the image below, there is a red canister. What is that canister for? I suppose it is for some flight testing purposes from what I can see. I can't ...
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 ...
4 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 ...
1 vote
1 answer
292 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 ...
65 votes
2 answers
20k 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. ...
4 votes
1 answer
366 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 ...
2 votes
3 answers
964 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 ...
2 votes
1 answer
381 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.
32 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, ...
0 votes
0 answers
193 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 ...
1 vote
0 answers
163 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 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 ...
8 votes
2 answers
1k views

How much could human power add to the endurance of an electric gyrocopter?

If we take a single seater electric gyrocopter like this one, could a human-powered propeller like this add to the endurance of the aircraft? The gyrocopter only needs a 32km/h forward speed to stay ...
4 votes
1 answer
652 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 ...
3 votes
1 answer
2k 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 ...
-1 votes
2 answers
1k 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 ...
1 vote
3 answers
463 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?
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.
2 votes
1 answer
555 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-...
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?
0 votes
5 answers
709 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 ...
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?
-2 votes
2 answers
148 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 ...