Questions tagged [amateur-experimental]

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Calculating Lift of a closed-wing drone

A group of students and I are designing a theoretical closed-wing drone and need to calculate lift based on the NASA lift equation. We've designed fixed-wing aircraft before and when it came to ...
4
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3answers
318 views

What is the difference between experimental and amateur built aircraft in the US?

What is the difference between experimental amateur and amateur built aircraft in the US, or are they the same? If not, is there a difference re specifications, inspections, engines, passengers, etc.?...
4
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1answer
94 views

Justification for the 2D cut-out method for determining a rocket's center of pressure

I've seen several tutorials on rocket stability where one can empirically obtain the center of pressure by cutting out a 2D imprint of the rocket and balancing the 2D shape as seen in the pictures ...
3
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1answer
142 views

How to modify an amateur kit build with wing hard points

I plan on modifying an amateur-built all-metal kit plane so it has a hard point under each wing where various external loads (cameras, probes, etc) can be fitted to (university research). The location ...
3
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2answers
341 views

For slow-flying ultralights, how would a delta wing compare to a biplane layout of equal wing area?

Context: By "slow-flying" I refer to ultralights that can be classed as "motorfloaters" - similar wing loading to a hang-glider, stall speed below 40km/h, cruise speed not much above. I'm interested ...
1
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2answers
343 views

Is c.g rear or fore of wing leading edge?

This video states that the c.g of most non tapered airplane is 25%-30% of wing chord REAR of the leading edge.The aerodynamic center(a.c) of most wing is 25% rear of the leading edge ....Does this ...
2
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2answers
169 views

Is there a flexible “cloth-like” material that can be used as “skin” for a non-conventional wing?

I am in the very early stages of playing with the idea of an ornithopter derived aircraft. The intention is to be able to scale the resulting aircraft, to passenger (or useful payload) carrying ...
2
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1answer
154 views

Could an amateur build a full-scale UAV?

FAA section 333 provides permission to fly in the NAS with an airworthiness certificate. Obviously, the design would need to be perfect with extremely redundant control schemes. Going through the red ...
1
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0answers
173 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 ...
1
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1answer
450 views

Are there other examples of human-electric hybrid aircraft?

Has there been a human-electric hybrid aircraft after this. A more streamlined design; maybe capable of soaring as well...
11
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2answers
4k views

Can I log time in a Cri-Cri twin-engine aircraft?

I was looking at potential experimental projects when I read this fascinating website about a tiny aerobatic-capable twin-engine airplane. It's light enough to be an ultralight, but much too fast: ...
11
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1answer
909 views

How exactly is the 51% rule applied for amateur-built aircraft?

I understand that for an amateur-built that you are required to build at least 51% of the aircraft yourself, but how can there be kits which appear practically completed, just some quick assembly jobs?...