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Questions tagged [solar-impulse]

A Swiss long-range experimental solar-powered aircraft

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1 answer
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Solar Impulse lift to drag ratio

What are the L/D ratios of the two Solar Impulse airplanes? I haven't been able to find them.
Abdullah is not an Amalekite's user avatar
1 vote
2 answers
129 views

Did Solar Impulse flight in commercial airspace and have kind of type 23 certification? [closed]

I read that the amazing Solar Impulse back in 2015 had circulated around the globe for 500 hours. It flew with speed 70 km/h and altitude of cruising 28000 ft. My questions are below Did it fly in ...
Zahi Azmi's user avatar
0 votes
0 answers
57 views

Can a large aspect ratio wing be actively controlled using distributed electric propulsion to avoid getting ripped apart in wind shear?

This question is related to the recent possibility of solar aircraft becoming flyable. Solar Impulse, the NASA Helios, and the Titan Aerospace/Ascenta Aerospace solar drones have all have issues with ...
user11377's user avatar
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4 votes
1 answer
1k views

What would be the stall speed of Solar Impulse?

In most of the tables, only the take off (22 mph) and cruise (43) speed of the Solar Impulse are listed. It is an experimental plane, slow, with very huge wing for solar batteries. The take off speed ...
h22's user avatar
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56 votes
4 answers
11k 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 ...
Gus's user avatar
  • 1,039
11 votes
1 answer
793 views

Why wasn't Solar Impulse 2 cleared for takeoff?

I've recently been watching videos of the Solar Impulse 2 (HB-SIB) flights, and I noticed that on several occasions, instead of giving clearance for takeoff, the tower told the pilot that "departure ...
Michael Hampton's user avatar
4 votes
2 answers
279 views

What happens if Solar Impulse II encounters un-expected head wind and runs out of battery power?

I noticed that battery charge level dropped to fair levels in some occasions in this article. It dropped to around 20% at the end of day 5 before morning of day 6. To what extent will a flight be ...
EEd's user avatar
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10 votes
4 answers
648 views

How does lowering altitude conserve energy in Solar Impulse 2?

In this article the author explains that the aircraft flies at a lower altitude to conserve energy. During the day, it climbs to its maximum cruising altitude of 8,500 metres to capture the most ...
Anupama's user avatar
  • 101
0 votes
1 answer
150 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?
nk379's user avatar
  • 321
5 votes
1 answer
225 views

What is the reason for different engine configurations seen on Solar Impulse?

In various images of the Solar Impulse aircraft, I see the engines mounted in different positions along the wing. Am I looking at SI 1 vs SI 2, or are the mount positions capable of reconfiguration ...
Gene Wedge's user avatar
18 votes
2 answers
3k views

Why did the Solar Impulse flight take so long?

The Solar Impulse just made big news for flying from Japan to Hawaii on a solar-powered plane in five days. But five days seems really long. Let's do the math on that. The distance from Japan to ...
David says Reinstate Monica's user avatar
10 votes
2 answers
683 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 ...
menjaraz's user avatar
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