Questions tagged [ultralight]

Questions regarding very lightweight powered aircraft.

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70 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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1answer
65 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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1answer
37 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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3answers
306 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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1answer
256 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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1answer
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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1answer
104 views

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

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, Class E airspace extends all the way down to the ...
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1answer
149 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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2answers
496 views

What is the primary reason that the non-towered airports KACV and KTVL have E4 extensions to E2 airspace?

NOTE-- this question is not about why it was desired to protect the airspace that ended up within the E4 "extensions". Rather, this question is about why that was done by designating that airspace as ...
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3answers
248 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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2answers
351 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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4answers
167 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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1answer
127 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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3answers
131 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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3answers
168 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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3answers
1k 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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1answer
76 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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1answer
94 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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3answers
1k views

Does the weight of the battery count as “fuel” in a battery powered ultralight?

14 CFR 103 compliant powered aircraft should be less than 254 pounds (excluding fuel). Do the batteries account for fuel in case of electric engine?
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4answers
408 views

How to determine the compressive force in the spars of a strutted wing?

How does one calculate the compressive force that the inner section of a strutted or braced wing (from the strut attach point to the wing root) experiences? I know how to calculate the tension in the ...
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1answer
130 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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1answer
120 views

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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3answers
2k views

Why does the Zapata Flyboard Air UL consume so much more fuel/hr than the Mosquito Air?

They are both ultralight and abide by FAA ultralight reg 14 CFR part 103. The Mosquito Air is an ultralight 1 person helicopter whereas the Zapata Air UL is a micro jet turbine powered 1 person ...
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1answer
108 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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3answers
725 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 ...
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2answers
175 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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0answers
49 views

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

Would FAR 91.227, or any other regulation, forbid use of ADS-B-out in an unregistered ultralight? Could the N-number field simply be left blank, without violating any regulation or law? One possibly ...
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2answers
124 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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2answers
97 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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1answer
245 views

How to calculate the shear centre of a wing?

How is shear centre of a wings calculated? i.e. how can I calculate the wing shear centre of a two spar wing with main spar at 0% of wing chord and rear spar at 75% of wing chord? (Assuming the two ...
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7answers
7k views

What is wrong with a high-speed landing for an ultralight or GA aircraft?

Is it okay to land an ultralight or a general aviation plane at a speed higher than the recommended landing speed for such plane? Will there be any damage if the descent rate is very low?
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1answer
190 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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4answers
233 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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2answers
628 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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1answer
195 views

What are the historical precedents of today's E2 and E4 airspace? (US)

What are the historical precedents of today's E2 and E4 airspace? From what previous airspace classes did these airspaces evolve? How do these precedents help us understand the significance of the ...
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1answer
72 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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1answer
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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1answer
119 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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2answers
598 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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3answers
1k views

What is a biplane propeller and how efficient is it?

Lazair ultralight series II used biplane props to absorb more power from the engine....so my question is what really is a biplane propeller and are they efficient in comparison to a four bladed prop?
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2answers
733 views

What airfoil is used on the Lazair ultralight?

This is the airfoil of the famous Lazair ultralight. What is the name of this airfoil?
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2answers
2k views

Did the twin engined Lazair ultralight have a throttle for each engine?

Did the twin engined Lazair ultralight have a throttle for each engine? I know larger aircraft have dual throttles. What about the smaller aircraft like ultralights? It would be so much easier just ...
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5answers
13k views

What is meant by a “congested area of a city/town/settlement” in FAR 103?

FAR 103.15 states: No person may operate an ultralight vehicle over any congested area of a city, town, or settlement, or over any open air assembly of persons. I'm wondering what is meant by "...
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1answer
303 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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0answers
95 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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1answer
384 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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2answers
1k views

Why do gliders have bungee cords in the control systems and what do they do? Are they on all control surfaces? What about ultralights?

Why do gliders have bungee cords in the control systems and what do they do? Are they on all control surfaces? Why don't ultralights have them?
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4answers
177 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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3answers
2k views

What are the disadvantages of having vortex generators?

I know the advantages of vortex generators (VGs): lower stall speed, lower landing and takeoff speed according to www.stolspeed.com. So what are the major reasons most GA planes and low speed ...
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1answer
226 views

Does a tandem ultralight need flaps on the rear wing if the front wing has flaps?

Does a tandem ultralight need flaps on the rear wing if the front wing has flaps? I understand that most Rutan canards don't have flaps as I was told if the main wing has flaps, the canards need one ...