Author Topic: largest size airplane made using solar powerd battery  (Read 2274 times)

gocnc

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largest size airplane made using solar powerd battery
« on: September 28, 2009, 09:07:38 AM »

Here is a fellow that made an electric powered airplane
When I have time I would like to try making this same plane
The problem is time
http://members.cox.net/todd-f/index.htm

My question is what is the largest size airplane made using solar powerd battery
No gas or any fuel like that


pie_row

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Re: largest size airplane made using solar powerd battery
« Reply #1 on: September 28, 2009, 11:04:42 AM »
Helios Solar Powered Aircraft


gocnc

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Re: largest size airplane made using solar powerd battery
« Reply #2 on: September 28, 2009, 11:53:27 AM »
Hi pie_row
Thanks for that video
I had never seen planes like that
I imagined that they would be able to carry people and cargo.
Maybe someone in this forum will come up with this idea

About the video
What uses would a plane like that have

pie_row

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Re: largest size airplane made using solar powerd battery
« Reply #3 on: September 29, 2009, 03:45:17 PM »
The pic on the right is what solar power in airplanes is mostly good for.

http://images.google.com/imgres?imgurl=http://apps1.eere.energy.gov/news/images/04_09_07_helios.jpg&imgrefurl=http://apps1.eere.energy.gov/news/news_detail.cfm/news_id%3D8139&usg=__jwnxAO1LRZp871o4vqtnpfzKRyc=&h=200&w=290&sz=29&hl=en&start=2&tbnid=g-S1kL_ff_b3XM:&tbnh=79&tbnw=115&prev=/images%3Fq%3DNASA%2BHelios%2Bcrash%2Bpress%2Brelease%26gbv%3D2%26hl%3Den%26sa%3DG 

I don't mean that disparagingly it's just the power density is to low this means that the wing loading is to low and so the air pushes (wind gusts) on the airplane too hard and they brake.  Solar powered airplanes are just to fragile.  http://www.backyardmetalcasting.com/forums/viewtopic.php?t=3449  This thread has an airplane in it that is at just about the lightest that can be built to be safely flown by a person.  You can make one lighter but they are to fragile to be flow with out worrying about air gust and other hazards.

What they were looking at using the airplane for was high altitude sustained flight.  Helios went to nearly 100,000 ft.  it was actually 96,869ft altitude.  (I think)  That is really high for a subsonic airplane.

« Last Edit: September 29, 2009, 03:47:29 PM by pie_row »