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Questions tagged [electric-engine]

Electric engine used as non conventional propulsion system of an aircraft.

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1answer
49 views

Proportionally, what is more affected by a hot and high takeoff - a electrically driven propeller or a turbofan?

My assumption would be the electrically driven propeller would be less affected compared to turbofans at high altitudes and take off as although the air would be less dense at these ambient conditions,...
3
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1answer
112 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 ...
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3answers
114 views

Would there be a purpose for a set of compressors in an electric turbo fan?

This is actually a two part question. Would there be a purpose to a compressor in an electric turbofan where there is no need for a combustion chamber, and if not, is there then a purpose for a bypass ...
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1answer
184 views

Could an electric airliner be aerotowed to cruise altitude by an electric “tug” aircraft?

The low energy density of batteries make electric aircraft need a high ratio of battery to payload. Take off and climb to cruising altitude could account for a substantial fraction of the energy ...
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0answers
76 views

Does the Lilium VTOL wings produces lift during takeoff?

I just had a look on some of the recent development in the personal VTOL electrical aircrafts. I am wondering if the Lilium VTOL wings produces lift during takeoff? I would expect a quit high wind ...
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4answers
464 views

Does the required torque to spin a propeller increase with RPM?

I‘ve currently been experimenting with different propellers: 12x12 prop, 16x12 prop (both two blades) and a 22x14 (6 blades) prop. They were propelled by a 2.4 kW electric motor with 260 kV on a 6S/...
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0answers
75 views

What‘s the diameter of the engines of the Airbus E-Fan?

does somebody know the diameter of the E-Fan‘s engines ? To me the look like around 80cm or what do you think ? Also, with more and wider blades and 60 kW motors instead of 30 couldn‘t they get much ...
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4answers
2k views

Are there any hybrid electric planes?

Are there any hybrid planes (planned), or would this be impossible because we don't have big enough batteries?
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1answer
1k views

What is an “all-electric APU”?

Understand that the APS5000 used in the B787 is the first all-electric APU for large commercial aircraft. Source: http://www.pwc.ca/en/engines/auxiliary-power-units Sorry if this sounds too ...
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1answer
1k views

Is there a limit to the possible altitude for electric jets?

So I was thinking about Elon Musk's supersonic electric jet idea. Assuming we have sufficiently energy-dense batteries, where would the limits be in terms of speed and altitude. His logic seems to ...
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1answer
545 views

Why do brushless motors heat up? [closed]

I would like to know what makes a brushless motor heat up. I'm aware of the problems generating the high temperature such as wire contact problems or overloaded motors. I want to know what makes a ...
3
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2answers
639 views

Does a “take-off” assist make sense for electric aircraft?

There is already a good answer that talks about how a catapult provides virtually no benefit for fuel-based aircraft. However, I'm wondering if the same answer is true for electric planes? For ...
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2answers
174 views

Are fully electric helicopters suitable for military operations?

I read this question about diesel-electric (DE) helicopters, which sparked the following question: Are fully electric helicopters suitable for military operations? They are more silent, and electric ...
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1answer
82 views

How do I determine the maximum thrust that a Tesla powertrain (P100D for example) could produce if attached to a single propeller?

I am theorizing a drone helicopter from a tesla powertrain (P100D). Lets assume the system is theoretically maximized with an optimum propeller (this is what I am currently stuck on). How much thrust ...
2
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2answers
200 views

Is this scheme for a single-fan electric airship with a rocket-like geometry workable?

I am currently designing a vertical take-off and landing vehicle that uses a Tesla powertrain connected to an electric ducted fan. Please comment on if my thought process is sound on my feasibility ...
54
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5answers
8k views

What energy density is required for the batteries in order to make an all-electric analogue of the Cessna 150 or similar plane?

I think I have some general understanding that at the present moment even with the best possible batteries, a 2 seater training aircraft (like the C-150) would be very impractical. I'm not even ...
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3answers
7k views

What's the use of so much torque on propellers?

(This question is closely related to this question) A typical Cessna 172 has a 180 hp engine, with a max. rotational velocity of 2700 RPM. Even small 1 hp electrical motors can achieve that RPM, and ...
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3answers
1k views

What does the 'hp' rating actually signify, with respect to an aircraft engine?

Let's say I've got a Cessna C172S with a Lycoming IO-360-L2A engine that produces 180 hp (that's the power output for sure). Let's say I've also got a water pump, that is rated at 1 hp (power input or ...
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3answers
2k views

What is the efficiency of running an electric motor from a gas generator?

If you were to run an electric motor from a gasoline or diesel generator, how big would the generator have to be to run something like the Siemens electric engine? Is this a viable model for replacing ...
3
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2answers
2k views

What would be the potential thrust of an “electric jet” like Lilium's?

Lilium claims to fly with "electric jets". Throwing out the debate over whether a non-combustion compression of a stream of air is a jet or only a ducted fan, what is the potential thrust each of ...
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8answers
5k views

Could there ever be a fully solar powered airliner capable of transatlantic flights?

Could a new or a modified existing airliner, e.g., a Boeing 737, be fully powered by solar energy and make the normal length trips aviation-fuel powered aircraft make?
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4answers
9k views

Why do solar planes have many small propellers instead of fewer large ones?

Many solar planes, like NASA's Helios (pictured above), NASA's Pathfinder, and to a lesser extent Facebook's Aquila employ the use of many small motor propeller sets instead of one or two engines like ...
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2answers
281 views

Pure electrical, minimally-noisy drone engines — Science fiction or real theoretical science? [closed]

I am not an aeronautic (or a Physicist) and sorry in advance if this question seems a bit funny to you... I ask the following question after seeing the following aviation concept in science fiction ...
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1answer
1k views

Are there any electric ultralight aircraft?

Are there any electric, FAR part 103 aircraft? FAR part 103 aircraft are unique in that they don't need a license to fly.
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2answers
160 views

Feasibility of using secondary props to generate power on an electric model aircraft [duplicate]

Beginning with the aeroplane itself, it is a small, fixed wing model aeroplane, reminiscent design-wise to a Cessna 172. It is completely battery powered and has a primary prop attached to a motor ...
7
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1answer
607 views

In what way(s) will making an airplane electric help to make it “quiet”?

In this blog I read about the Quiet Flight Initiative, which - if I understand correctly - will be quieter than a comparable carbon fueled plane at least in part because it is electric. It's an ...
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3answers
397 views

Can an electric aircraft self-recharge? [closed]

I'm trying to design an aircraft with a long range, and I thought that an electric aircraft with a generator powered by the motor would be able to do that. However, I've seen very few of these ...
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3answers
2k views

Could a plane with an electric turbine engine generate enough lift to provide a electric areodynamic lift and runway to space?

This question is similar to my previous ones but configuration is different and so is the question. Could a modified electric turbine engine (E-Fan) plane create enough of its own lift not to burden ...
2
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2answers
459 views

Could the vertical stabilizer be removed on the NASA X-57?

I was reading this article about how NASA will develop this new X-57 X-plane which has many tiny electric motors mounted on the wing. Now, I wonder: How come this aircraft still has a vertical ...
1
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1answer
393 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...
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1answer
378 views

What are the design goals for NASA's X-57? [duplicate]

There have obviously been work going on prior to the X-57 announcement (see LEAPTech and Joby Aviation http://www.jobyaviation.com/LEAPTech/). However, what does NASA actually think they will achieve ...
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2answers
538 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 ...
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2answers
568 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 ...
0
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1answer
139 views

Is there any benefit to science from the Swiss built solar plane flying across the globe? [closed]

Are there any innovations that were made during the development or flight of the Solar Impulse plane that would go into any type of regularly used airplanes in the near future?
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10answers
36k views

Could an electric engine provide the same performance as jet engines on current aircraft?

I have looked at various questions on this SE site regarding this topic but I have not really found a satisfactory answer. Some comments here regarding torque and power in electric motors vs gasoline ...
7
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5answers
4k views

What does Elon Musk mean by “electric jet”?

Elon Musk has said that he has a design for a vertical take off and landing super sonic electric jet. I was under the impression that jet engines work by burning fuel, expanding volume and thus ...
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6answers
6k views

In helicopters, why not have electric motors controlling blade pitch?

From my related question comes this idea of electrically controlled blade pitch in helicopters. Control linkages in helicopter rotors seem to be pretty complex. This surely incurs a lot of friction, ...
6
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0answers
172 views

Are there any future regulations planned for electric multi-motor LSAs?

It seems with electric control of the multi engine configuration, such as with NASA's new leap tech technology, that there should be a way to use multiple motors in the LSA category. Is there anything ...
17
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6answers
16k views

How many kilowatts to get an electric 747-8 airborne?

Reading about the Airbus E-Fan and it's dual 30 kW thrust fans caused me to wonder: assuming the need for four electric fans, how many kilowatts would be required to power each fan with enough thrust ...
3
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3answers
474 views

Electric Airplane - Hybrid / dual type engines how would that work?

If you have an airplane with electric propellers for take off and landing and you have a turbofan/jet to reach higher speeds for cruise. For example, electric propellers can go to 250mph and turbofan ...
12
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6answers
4k views

For an electric airplane are propellers the only option for propulsion?

This is for an electric airplane (so no fuels for combustion): Are propellers the only option? Is there a turbine-jet possible with only air intake, electrically compress, and a turbine and nozzle ...
18
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2answers
2k views

What are the advantages of the NASA LEAPTech propeller on wing technology?

NASA has detailed experiments with a new type of parallel array of small electric propellers on the leading edge of the wing technology that they are calling LEAPTech. The press release notes that ...
15
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2answers
18k views

What are the advantages and disadvantages of ducted fans in designs such as the Airbus E-Fan?

I have read that it increases thrust and reduces noise. Is there a downside to this? (Image source: Wikipedia)
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5answers
3k views

Does it make sense towing airplanes to the head of airstrip by external (eg electric) means?

Does it make sense towing airplanes to the head of airstrip by electric means, whether internal or external? Taxiing from the gate to the runway on jet power seems like a waste of fuel. Is it ...
6
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1answer
1k views

What license is needed to fly the electric “Volocopter” helicopter?

Here is a video of the aircraft in flight. The Volocopter Looks like it would fly quite differently than a helicopter. Is that true? Does that matter? Is it still a helicopter license that's needed?
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2answers
944 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?