Questions tagged [ultralight]

Questions regarding very lightweight powered aircraft.

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What do you need to have onboard for flights with an ultralight/sport aircraft over water (Atlantic, Pacific)? Life raft possible (weight/size)?

Remark: For us in Germany an UL is a 2 seater with 470/600kg MTOW. AFAIK those are named Light Sport Aircraft in the US/Australia. Example: https://en.wikipedia.org/wiki/Ikarus_C42 What do you use if ...
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3 votes
2 answers
1k views

How can an ultralight be slowed down for landing in a tailwind?

When flying an ultra light and I have a tail wind, and, with the engine at idle how do I slow down to land ?
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4 votes
1 answer
360 views

Is it legal to hire a test pilot to conduct the first flight of a homebuilt ultralight in the United States?

Is it legal in the United States to hire a test pilot to conduct the first flight(s) of a homebuilt ultralight? This seems like a bit of a grey area- FAR 103.1(b) states that an ultralight aircraft is ...
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0 votes
3 answers
198 views

Is Peter Sripol’s Mk4 ultralight design safe and/or practical? [closed]

I recently rewatched Peter Sripol’s Mk4 ultralight video Obviously, the aircraft flew, but I have several questions as a result. First and foremost, is a vinyl-covered ...
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  • 2,414
0 votes
1 answer
264 views

Do the NPRMs & Final Rules preceding 1993 "alphabet" airspace re-designation indicate that these phrases were meant to exclude Class E "extensions"?

Note-- this question is specifically about the content in the rule-making documents leading up to the September 16 1993 "alphabet" airspace re-designation, which is when the terms "...
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2 votes
1 answer
132 views

Do ultralights registered in Germany require an annual inspection?

I'm trying to find out how the German Ultralight aircraft ongoing inspections system works - do German registered Ultralight need to be inspected annually before they can then be operated for a ...
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7 votes
4 answers
2k views

Is a VW Beetle engine a good choice for a light two-seat aircraft build? [duplicate]

What do you think of an air cooled Volkswagen engine for building a light two-seat airplane? This is probably the only engine I can get my hands on that needs no reduction gear and has enough HP. ...
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0 votes
1 answer
211 views

I'm trying to replace the Colomban CRI CRI engines with twin 72v 3000w dc electric motor. Will the plane fly?

This is the 72V 300W DC motor: (source)
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2 votes
2 answers
373 views

Can an ultralight be flown at night or IFR?

In Canada, can an ultralight be flown at night or IFR by a PPL pilot with a night flying or IFR endorsement if the ultralight is equipped for night flying or IFR ( eg. heated pitot tube, nav lights, ...
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  • 889
6 votes
1 answer
232 views

Can a US citizen fly a US ultralight into Canada?

Can a US citizen (no pilot license) fly a US ultralight into Canada or any other country? Due to a special exemption, Canadian pilots can fly a basic ultralight (registered but no certificate of ...
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  • 889
2 votes
1 answer
118 views

Are vortex generators considered high lift devices on US ultralights?

Are US ultralights allowed to have vortex generators? I understand US ultralights are required to have a landing speed of 28mph without the use of high lift devices. I understand this is so that the ...
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  • 889
2 votes
1 answer
224 views

Can a single seater airplane fly with 50 lbs of thrust

An airplane with 10 sq meters of wing five meters fuselage and including one person. can it fly with 50 lbs of thrust? And the max weight is 400 lbs
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-1 votes
1 answer
85 views

Can we get 0:40 thrust to weight ratio from three small engines

Because I have an engine of 13 hp four stroke 1 cylinder that pulls about 0:20 T/W ratio. and is it possible to multiply the thrust by two? Using two more small engines which is 6.5 hp each on the ...
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2 votes
2 answers
432 views

If operating an ultralight with private pilot certificate, which rules apply?

If a holder of a private, commercial, or ATP pilot certificate operates an ultralight aircraft; and that aircraft is also equipped with the radios and transponders required by an airspace for GA ...
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1 vote
1 answer
293 views

Do hours flying "advanced ultralight" aircraft contribute towards your license in Canada?

I'm interested in the business possibilities of offering flight training in Southern Ontario, in particular using advanced ultralight aircraft. I realize that this is uncommon, of course, but my ...
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0 answers
92 views

Can I use Stihl fs250 engine for ultralight aircraft? [duplicate]

RPM 9000 Hp 2.2 Engine weight 6kg Plane weight 40kg Body weight. 70 Propellers(2blades) length 30 inches Wings length 120 inches
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2 votes
1 answer
111 views

Do dark conditions due to high-altitude smoke prevent ultralights from flying?

According to FAR103, you have to operate ultralights between sunrise and sunset, or between the times laid out in the Air Almanac (if you're in Alaska.) This means that the FAA has determined that ...
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2 votes
1 answer
249 views

Is there an official English version of LTF-UL?

I have found the German version of the ultralight regulations under Germany airworthiness authority, but I have not found a link for English version of that. is there any?
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3 votes
3 answers
433 views

Why don't aircraft owners put vortex generators on the top of their flaps to extend single flap lift creation past 40 degrees?

Why don't ultralight/LSA aircraft owners put vortex generators (VGs) on the top of their flaps? I understand that the maximum flap angle for a single lift creating flap is 40°, but 80° with a double ...
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  • 889
12 votes
1 answer
1k views

Why do tail dragging seaplanes not exist?

I am in the process of starting to build an ultralight that will be a tail dragger with floats, and in my conversations with the fellows I'm building it with, we've realized we've never seen a plane ...
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3 votes
4 answers
388 views

Is PVC tubing a good material for helicopter airframes?

Been thinking of getting into the hobby of building ultralight helicopters, and would PVC tubing be a good choice to build the overall airframe?
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5 votes
2 answers
781 views

How do I obtain permission to fly in surface class E airspace under FAR-103?

I'm a paramotor pilot operating under FAR 103, and I'm trying to determine who I need to ask for permission to fly in class E airspace that extends to the surface and is designated for an airport. For ...
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0 votes
4 answers
308 views

Why should I not use a "lifting tail" on my ultralight design?

In my misspent youth I designed and built many rubber, gas, and RC models. When I wanted good climb and glide I used a aft CG [60 to 80%] and a lifting tail. I had no stability or control problems, ...
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1 vote
1 answer
206 views

What is the minimum weight aircraft in which someone can build logged flight time?

What is the minimum weight aircraft in which someone can build logged flight time? Is logging flight hours in an ultralight possible?
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1 vote
3 answers
332 views

Why would the propeller of a lightsport plane or ultralight w/ Rotax engine be connected to the engine through a clutch, and not turn at low rpm?

Why would the propeller of an ultralight or lightsport plane be connected to the engine through a clutch, and not turn at low rpm? I've often witnessed the engine start of a Bailey-Moyes Dragonfly (...
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1 vote
3 answers
240 views

Can an automatic gearbox improve engine transmission for an ultralight? [duplicate]

I am working on my dream to build and fly an ultralight aircraft so I wouldn't like to know the following: Does adding a motorcycle automatic gear box to an engine improve on the strength for an ...
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5 votes
3 answers
4k views

Can I use motorcycle engine in aircraft [duplicate]

I am trying to build an Aircraft, The weight of the Airplane will be around 40 Kg with engine and 8 liters of fuel and with me the total weight will be around 90 to 100 kg and I want to use a ...
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2 votes
2 answers
233 views

What is the approximate range of the Pelegrin Tarragon?

I recently read about the Pelegrin Tarragon ultralight aircraft made in my country, and got interested in it. Is it possible to have a reasonable estimate of the average distance you could cover in ...
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-1 votes
1 answer
105 views

What should I build my ultralight out of? [closed]

I have always wanted to fly and I have taken some ground school but I don’t have enough money to finish my ppl and get a plane so I think ultralights are the next best thing, it is just what should I ...
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2 votes
1 answer
872 views

In reference to airspace, what does the FAA mean by "within the lateral boundaries of"? Is this construed to also imply a vertical limit?

Several FARs use the phrase "within the lateral boundaries of" (x airspace). What does the FAA interpret this phrase to mean? Specifically, what is the vertical extent of the airspace encompassed by ...
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1 vote
1 answer
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What is the maximum takeoff weight allowed for a part 103 ultralight?

What is the max takeoff weight (MTOW) for a part 103 vertical takeoff (VTOL) ultralight? And is the value peak or continuous limit?
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  • 79
1 vote
1 answer
225 views

Can a part 103 ultralight weigh 400kg fully loaded? [duplicate]

I am designing an electric VTOL personal part 103 ultralight. My question is: I have 114kg for the ultralight, 100kg for the pilot and 30kg for the baggage. About 260kg is enough to be take off ...
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  • 79
3 votes
1 answer
655 views

What indication has the FAA given that phrases like "surface area of Class E airspace designated for an airport" do or don't include E4 "extensions"?

This question pertains to the airspace of the USA. The dashed magenta shape on the sectional chart around KGUP depicts the horizontal extent of the Class-E-to-surface at KGUP. Inside this perimeter, ...
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  • 17.1k
3 votes
1 answer
237 views

In which countries can I fly an FAA compliant Part 103 ultralight? [closed]

İf I have a legal part 103 ultralight as defined by the FAA, in which countries may I fly this ultralight in the world in addition to the USA?
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  • 79
2 votes
1 answer
233 views

How can I certify an ultralight design as complying with part 103?

Can you help me about which procedure do I need to follow in order to have a certificate that my design is part 103 ultralight. And as a information how long would it take to get the certificate and ...
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-4 votes
2 answers
572 views

Is a 3 horsepower engine powerful enough for a 100 pound ultralight? [duplicate]

I'm building an ultralight and it weighs 100 pounds empty. My only engine is 3HP. Is that good enough?
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6 votes
3 answers
320 views

Would FAR 91.227, or any other regulation, forbid use of ADS-B-out in an unregistered ultralight?

In the US, would FAR 91.227, or any other regulation or law, forbid use of ADS-B-out in an unregistered ultralight? Could the N-number field simply be left blank, without violating any regulation or ...
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0 votes
2 answers
298 views

At what altitude, if any, may an ultralight overfly the Gallup airport (KGUP) with no prior authorization without violating FAR 103.17?

At what altitude, if any, may an ultralight overfly the Gallup, New Mexico airport (KGUP) with no prior authorization without violating FAR 103.17? This is a question about the meaning of "within ...
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2 votes
2 answers
212 views

How to select and electric propulsion system for my experimental Ultralight?

I've been trying to design and build, my experimental Ultralight using electric propulsion system, My plane designed base on Slaler and Gensis ultralight , following is the primary calculation Empty ...
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-1 votes
1 answer
476 views

Does anyone know free DIY ultralight plans? [closed]

Is anybody aware of open source plans for an ultralight that can be made out of standarized aluminium/wooden parts without welding?
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  • 2,252
2 votes
4 answers
452 views

Is it possible to power an ultralight airplane with a single-cylinder weed-whacker engine?

Plane: Weighs 200 pounds. 16 FT wingspan, 36in. by 5 in. airfoil Engine: 3,000 RPM, 2 HP Propeller: 4ft with 4 blades and weighs 4 lbs. Is there perhaps an equation that could determine this?
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-2 votes
2 answers
2k views

What engine should I use for a home-built ultralight (That is rideable) [closed]

I am looking for an engine that is powerful + cheap engine that will work in an ultralight aircraft and fly 1 person as well as the plane. yeah, this is kinda specific, but I have a tight budget and ...
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1 vote
1 answer
77 views

Do ultralights need to have EPA-compliant engines in the USA and Canada?

Do ultralights need to have EPA-compliant engines in: The USA? Canada? Just wondering if you could use a hobby type 2 stroke engine for a twin engine Lazair type ultralight. I don't think they are ...
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  • 1,507
0 votes
1 answer
140 views

Does anyone have free plans for a ultralight?

I am looking for free ultralight plans for a beginner. I have been wanting to fly but I don’t want to spend thousands on a license so ultralight is the next best thing.
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1 vote
2 answers
2k views

Can a harbor freight predator 212 cc engine be enough for an ultralight [duplicate]

Hi I am planing on building a budget ultralight and I was wondering if a 6.5 hp 212 cc predator motor will be enough and if so what size prop should I use. A little background, it is going to be a ...
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13 votes
1 answer
5k views

Why does Canada recommend a minimum rate of climb for ultralights of 300 ft/min?

What is a safe minimum rate of climb for ultralights? I understand most ultralights climb at least 300-800 ft/min and in fact the Canadian ultralight specs recommend a minimum rate of climb of 300 ft/...
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  • 1,507
3 votes
1 answer
396 views

Is there any legal way to fly an inline twin-engine aircraft with a single-engine certificate?

Is there any legal way to fly an inline twin-engine aircraft with only a single-engine endorsement? For example, if it's an ultralight or amateur built? I understand Rutan's Defiant was an inline ...
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  • 1,507
1 vote
1 answer
500 views

Is it possible to fly an ultralight aircraft with a 13.4kW engine?

I want to build an ultralight within the 115kg preload (US standard). Can I use and engine with the specifications below? My weight is around 63kg. Rated output: 13.4kW(18HP)@3600RPM
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  • 11
5 votes
1 answer
150 views

Do UL aircraft complying with LTF-UL need to copy an existing design pattern?

With my current pipe dream being to get physically involved in aviation instead of only theoretically, I looked into the regulations for ultralight planes in Germany. On multiple occasions in the ...
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2 votes
4 answers
312 views

Where is the compression on a compression strut in a tube and fabric airplane coming from?

I understand the functions of every part of a tube and fabric (two spar) ultralight wings and the loads they carry but what keeps puzzling me is the compression strut of a two spar wing as seen above. ...
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