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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26
votes
2answers
6k 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 ...
2
votes
3answers
396 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 ...
3
votes
1answer
178 views

Can a kite take advantage of crosswinds to gain speed? [closed]

In a form off a kite can wind be redirected like a sail boat in any direction? Can cross winds around a jet stream be helpful in speed in such a design?
0
votes
5answers
586 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 ...
22
votes
4answers
3k views

Would an aircraft with contra-rotating propellers longer than the plane's wingspan be able to fly?

I enjoy taking the time to try and visualize how fictional aircraft might actually work in reality. Unfortunately there are some that seem highly impractical from an engineering student's point of ...
19
votes
1answer
1k views

How can the Perlan II glider climb to 90,000 feet?

I've been reading material about the Perlan II experimental glider. They hope to take it up to 90,000 feet -- higher even than an SR-71 BlackBird. But the Perlan II is just a glider. Can it really ...
21
votes
1answer
1k views

What is the 'arm' at the rear of the X-29?

In this image of the Grumman X-29, there is an 'arm' just above the exhaust nozzle leading forward and, apparently, attached to the right side of the fuselage. What is this and what is it for? Source:...
10
votes
2answers
645 views

What considerations drove the choice of the Solar Impulse engines configuration?

Solar Impulse makes me think of a motorglider due to its aspect ratio. The Upward cranked tips wing configuration along with the engines configuration particularly draw my attention: The 2 innermost ...
8
votes
2answers
886 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
1answer
348 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 ...
2
votes
2answers
669 views

What are some alternative benefits to electric propulsion?

The context I am asking is regarding if electric motors could ease the fuel cost, take off weight, or runway length if they were set up in 'hybrid' configuration with regular hydrocarbon engines. If ...
1
vote
3answers
340 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?
22
votes
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
750 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. ...
7
votes
1answer
2k views

Why do forward-swept winged fighters have the main wings in the back?

These are the only 2 fighter jets I know of with forward-swept wings. (Su-47 and X-29, they're both still experimental). As you can see, they both have their wings in the back, not the middle. Why is ...
5
votes
3answers
1k 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 ...
2
votes
2answers
923 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 ...
2
votes
1answer
469 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-...
-1
votes
4answers
708 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 ...
-1
votes
2answers
464 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 ...