Hi Gents.


I have DiyDrones Hexacopter with 850kv motors.



Currently running with 3s 5000mAh & 10x4.5 plastic prop.

Hovering at 50% Joystick.

Max flight time is 8 min with 8m/s horizontal speed.

Payload without batt = 400g

50m above sea level.

What should i do to achieve 20min + flight time in 8 m/s horizontal speed.


2x 4cell 6000mah?

Carbon prop?

Carbon frame?

Better motors?







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You will not reach 20 minutes because of your weight. The more batteries and rhe bigger their capacity, the more weight.But the extra battery weight increases faster then the increased capacity (flight time).
Unfortunately you must thus cut a maximum of weight off. But could you cut down enough weight to reach 20 min ? Try and let us know about your experiments!

You will have to do it all.

Lower kv motors (300-400), hardcore ones with japanese bearings etc - axii, tiger etc.


Larger (14-15" props), preferably graupner e-props or similar (there are plenty to choose from but i stick with the graupners)


Higher cell count - 4s will probably do, but I'd be aiming for at least 12000mah (3x4000mah packs), maybe one more, in which case you might need bigger props.


The rest of the weight will matter, but will be insignificant compared to the batteries as long as you keep it sensible.


Oh and leave the camera at home ;)



The simple solution is fly a plane.

Thx guys.

Will this configurations effect the stabillity of the aircraft.  E.g lower kv motors with bigger props at 4s battery?

What is the drawback & benefit?

Would it be a better option to use OctoCopter?

I must say im impressed about how great this HexaCopter flies. 


Multrotors are extremely inefficient and 20 minutes may not be possible. For long flight times you need an airplane or a helicopter with a gasoline engine.



Everything is possible ;)

Just matter of science, money & goodwill..   ;)


RCTimer has a setup that claims 23 minute flight times? Has anyone tried one of these? http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=...



Looks like they use very low 350 Kv motors with very large props. Large props at a very low RPM should be much more effecient.






oh, its possible



Has anyone got any experience with these battery`s?



My 3s 5000mAh hyperion battery`s weight = 428g

This 4s 11000mAh MaxAmps is = 825g


This should increase my flight time pretty much.





Can you please describe "flight time"?

Hover time or acutal flight time? Speed?



That is the RCtimer copy of  the DJI S800 spreading wings. I have the DJI original and yes with 2*6200mah  6S batteries i get about 15 minutes carrying the zenuse and nex-5, and over 20 without the payload.

This is incredible.



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