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Old May 07, 2012, 02:46 PM
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High altitude flight.?

Anybody flown their multirotor at high altitude, 5000m above sea level, wondering what the effects would be on lift & power compared to sea level. Any experiences?
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Old May 07, 2012, 02:55 PM
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I could try checking it in the lowest place on earth ..
The dead sea
And the lower you fly -- the better. 1 feet over the ground there would be Lowest..mmm
Were the air tube over the props is the highest \ more heavy..
Water boil there at 101 oc..
Interesting ..

Guy
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Old May 07, 2012, 05:00 PM
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Quote:
Originally Posted by squigg View Post
Anybody flown their multirotor at high altitude, 5000m above sea level, wondering what the effects would be on lift & power compared to sea level. Any experiences?
No noticeable difference.
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Old May 07, 2012, 06:53 PM
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http://www.ecalc.ch/xcoptercalc_e.htm
I checked my spec in here & then changed the altitude from 500m to 5000m & my throttle hover value went from 52% to 94% ?
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Old May 07, 2012, 11:23 PM
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Quote:
Originally Posted by squigg View Post
http://www.ecalc.ch/xcoptercalc_e.htm
I checked my spec in here & then changed the altitude from 500m to 5000m & my throttle hover value went from 52% to 94% ?
Ok I read your units wrong. I thought you said 5000 feet. 5000 meters will make a difference in your machine. The air is very thin up there.
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Old May 08, 2012, 12:40 AM
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<Original post deleted. O.K it's early I haven't had coffee yet and rubbish was generated by my brain cell.>

I guess you are gonna climb a mountain or something - not fly FPV from ground level ?

Should be interesting to see how much difference 5,000 metres altitude makes to the payload capability of the multicopter
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Old May 08, 2012, 01:55 AM
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Thats right Sparklet, was offered a place on an expedition to high altitude to do some filming but i dont think my rig will perform too well above 5000m,
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Old May 08, 2012, 03:06 AM
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Originally Posted by squigg View Post
Thats right Sparklet, was offered a place on an expedition to high altitude to do some filming but i dont think my rig will perform too well above 5000m,
How about an electric powered glider ? Something foldable for the weekend sir ?

Other problems may occur if the temperature is low. Props become more brittle and the duration and power output of lipos drops off dramatically.

During the winter I carry my lipos in an insulated bag with a small bag of rice in with them The bag of rice is popped into the microwave for a short spell - until just nice and warm. Works a treat......... you are taking a microwave oven ?
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Old May 08, 2012, 11:49 AM
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Quote:
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Thats right Sparklet, was offered a place on an expedition to high altitude to do some filming but i dont think my rig will perform too well above 5000m,
OTOH, I know for a fact that Tabby had flown his Maxi Joker 2 single main rotor electric helicopter at the top of Mauna Kea which is right under 14,000 feet above sea level.

You will need to have a very good power to weight ratio on your multi rotor to fly at 5,000 meter.
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Old May 08, 2012, 06:39 PM
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Does anyone have concerns about flying so high with respect to commercial and private aircraft etc?
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Old May 08, 2012, 09:49 PM
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Does anyone have concerns about flying so high with respect to commercial and private aircraft etc?
I think he's looking at 5000m above sea level, not above ground level. If you are on a mountain you could be at that altitude and not have left the ground yet!

Rob D.
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Old May 09, 2012, 01:32 PM
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Not many 5000m mountains in Ireland ;-)
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Old May 09, 2012, 01:42 PM
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Ha! I completely misread it! thanks

Quote:
Originally Posted by nocontrol1 View Post
I think he's looking at 5000m above sea level, not above ground level. If you are on a mountain you could be at that altitude and not have left the ground yet!

Rob D.
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Old May 10, 2012, 01:11 AM
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For two days I almost went up to 14,000 feet and test my quad just for the OP? Unfortunately I only had shorts on and it is cold up there.
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Old May 10, 2012, 08:07 PM
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I've flown my tricopter at over 4300 meters, at Pangong Tso lake in the Indian Himalayas. It needed almost full power and behaved like a lead sled, more than usual anyway!

Flying the tricopter FPV at Pangong Tso lake in Kashmir, Northern India (2 min 38 sec)


At that time I had only been learning to fly it for a little over a month, so I'm sure if I'd go up there again I wouldn't have much trouble.

I carried with me many propellers to try out, but in the end, mostly due to lack of time for testing, I simply flew with the normal 10x5 propellers I use at sea level.
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