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Old Apr 02, 2015, 12:22 PM
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solar power in sailplanes

could be possible, practical, to use solar cells in our planes? especially duration?
already there is at least 1 that is doing so. it is 5 meters span, but could this be done in smaller like 2 mts? where could we find cells that can be used for this, at a reasonable price?
any1 with some data will be welcome.

In 2005, Alan Cocconi, founder of AC Propulsion, succeeded in flying an unmanned airplane (drone) with a 5-metre wingspan for 48 hours non-stop, propelled entirely by solar energy. This was the first time a device of this type was able to fly through a whole night, thanks to the energy collected by, and stored in, the solar batteries mounted on the plane.
seen here:
http://info.solarimpulse.com/en/our-.../#.VR15X13F9Ko

please bring only positive comments.
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Old Apr 02, 2015, 02:13 PM
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http://www.rcgroups.com/forums/showthread.php?t=2357464
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Old Apr 02, 2015, 03:46 PM
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it's here

here is a list of planes with solar power, so not only is feasible, it is being done already.
http://www.solarflugzeuge.de/unbemannt.html
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Old Apr 02, 2015, 03:46 PM
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sure thing

Quote:
Originally Posted by jkettu View Post
thanks
great link
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Old Apr 02, 2015, 04:42 PM
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source

now, where can we find cells for a reasonable price? that is the quest.
found this:
http://www.ebay.com/itm/1pc-5-5-22-5...79252978&rt=nc
but no weight available.
any1?
besides, where can we find comparative specs?
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Old Apr 03, 2015, 02:10 AM
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data

the cells mentioned have this data:
Features:
* Semi flexible -so less likely to break when tabbing and offer additional ways to use them
* 22.5 % efficient -One of the highest powered solar cells available
* Both Contacts are on the back: These have both the Positive and Negative points on the back
allowing neater panels and alternative ways to use them.
* Mono Crystalline
*Size 125mm x125mm
* Power output: 3.3-3.4watts, 5.93A (Impp) ).58V (Umpp)

i hope this last data can provide what is necessary to calculate how many are needed, depending of the airplane size, weight and motor used-or needed.
just guessing.
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Old Apr 03, 2015, 06:59 AM
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InJamNoOneCanHearYouScrea m
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Phil,
I use Electronic Goldmine for my Solar fixings:
http://www.goldmine-elec-products.co....asp?dept=1173

The place sends stuff out very quickly. Yes they lack specs in weight and size and such, but for cheap coin you can buy one and evaluate it.

Wally
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Old Apr 03, 2015, 07:38 AM
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input

that sounds great, thank you very much.
which 1s you have tried? results? figures? any data is great.
have you used then on a model?
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Old Apr 03, 2015, 02:02 PM
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InJamNoOneCanHearYouScrea m
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I use this panel to charge the platform while awaiting the next round at most contests: http://www.goldmine-elec-products.co...?number=G15555

It puts out 6-7VDC at about 150-250mah in direct sunlight. More than enough to keep the flight pack topped off. Don't forget to add the diode on the positive side!!!!
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Old Apr 03, 2015, 08:05 PM
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If you want to get technical, ALL sailplanes are by definition solar powered. Have been since they were first invented

The sun heats the ground, which warms the air that then rises and if you're lucky carries your sailplane with it. Solar energy also powers the wind, which takes care of the slope gliders and dynamic soarers.
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Old Apr 04, 2015, 06:11 AM
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Old Apr 05, 2015, 10:42 AM
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data

i have been able to find some data here:
http://www.asl.ethz.ch/research/asl/skysailor

wingspan 3.2 meters
auw 2.4 kg
with 216 cells gets 90 watts
it uses 16 watts at level flight

that is a start.
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Old Apr 05, 2015, 10:53 AM
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more data needed

but it does not say what size the motor and the battery are. that would help a lot to have a better idea of what to use for other sizes.
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Old Apr 05, 2015, 11:27 AM
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Check the design PDFs from links in the page above.
Not exact configuration but a lot of info.

But I am more curious about other thing... do you have sun in Canada ?
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Old Apr 05, 2015, 12:27 PM
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weather

Quote:
Originally Posted by renatoa View Post
Check the design PDFs from links in the page above.
Not exact configuration but a lot of info.

But I am more curious about other thing... do you have sun in Canada ?
thanks. i will follow the link.
i live in what the locals call 'the city of windsor', but the whole name is 'the city of winds-or storms'.
sometimes we get some sun. no, seriously, it is not too bad. the main problem is, as you may hint, the winds!
i manage to get some flights by watching the weather channels (several of them) and looking through the window, and then flip a coin and take a chance, but if when i reach the field the wind is too much i don't fly. what happens is that in the region of the great lakes, weather changes so swiftly that the tv stations have to report ever 10 minutes. proof of this are the more than 2,500 shipwrecks in lake superior alone. and am not talking about tornadoes-that is another story, but they hit more to the south anyway.
the fact is, we don't get bored with same weather all the time.
but seriously, when weather is good, it is a beautiful scenery.
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