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Gaza07:
21 Sep 2019 13:20:58
New Black n Black Theme installed  :smiley:
ched:
31 Aug 2019 20:37:03
Looking forward to BFU #9 footage  :D Hope you all had a great time
Gaza07:
31 Aug 2019 04:46:44
Hope you all have a great day today at the BFU 9  :beer2:
dp106:
29 Aug 2019 11:19:07
try again now, hopefully it should be resolved...
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29 Aug 2019 11:17:40
Should be fixed now
hoverfly:
29 Aug 2019 11:12:33
replies with only a few words are being rejected as file too big.. :hmm:
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29 Aug 2019 11:09:33
3D Site also affected
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29 Aug 2019 11:09:11
Gaza is on the case
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29 Aug 2019 11:09:03
there are currently issues with the forum
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29 Aug 2019 11:06:07
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3d - Printworx

Printing 3d Forum

Short Flight times Hot motors ESCs, But super stable

Started by tleibe, Tuesday,June 18, 2013, 11:18:50

Previous topic - Next topic

tleibe

 :cry :banghead:



Hi I';m flying six of these: NTM Prop Drive Series 35-30A 1400kv, on a hexa 40a ESC 4s 4400 lipo 10x 4.7 APC props. only getting 5 mins flight times and hot motors escs hovering at 40% throttle, super stable in all modes except auto (pulses when moving forward) apm 2.5 running v2.9.1 Any ideas to increase flight times ???? (and stop pulsing in auto? solid on loiter pos and alt hold)??? Cheers Tim

Biffa

I';m no expert, but running 10 inch props on 1400kv on 4';s may be a little much.

I would come down to 8 inch props, you will draw less amps and have cooler motors and most likely see an increase in flight time also.
Steve

DarrellW

You probably are pushing the motors a bit hard, that said you';re using one hell of a lot of Watts there, how big/heavy is your hex?
Your low flight times are down to the Wattage - I make it about 3000 in total at full throttle. For the motors and esc';s to get hot at 1/2 throttle something has to be wrong.
I think..........I think I am........therefore I am.............I think!

fruitsalad

you are frying your motors and your escs wont last long before they pop,way to much power for escs and motors,
try 7x4 -8x4 on 4cell,or drop to 3 cell lipo..
your setup is pulling over 70amps at full throttle,your motors are rated for 45amp max..
dont grow up,just buy bigger toys!!!!

tleibe

Thanks guys seems like its a conclusive not enough power for prop size, is there a formula that you guy use to work the correct power to prop size ratios out?

Thanks again For all your help :))

fruitsalad

use drive calc,
imput your voltage,select motor,and your esc in drop down menus..
then run through the different prop sizes to see which suits you best..

http://www.drivecalc.de/
dont grow up,just buy bigger toys!!!!

ChrisH

Try this:

http://www.ecalc.ch/xcoptercalc.htm?ecalc&lang=en

It can be a bit confusing but have a play. It certainly sounds like the props are too big for the Kv of the motors. High Kv smaller props.

~~
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

ChrisH

Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Gaza07

+1 props are way to big for 14400kv motors as suggested try 8"  ~~  :beer2:

fruitsalad

Quote from: Gaza07 on Tuesday,June 18, 2013, 20:33:06
+1 props are way to big for 14400kv motors as suggested try 8"  ~~  :beer2:



for that kv youd need some serious tiddly props  :tongue: :laugh:
dont grow up,just buy bigger toys!!!!

tleibe

Thanks again guys will reduce props for now but after later may upgrade motors etc any recommendations on bang for buck motors up to he job need to lift 3kgs including frame ?

Thanks again Tim

DarrellW

Quote from: tleibe on Tuesday,June 18, 2013, 22:58:47
Thanks again guys will reduce props for now but after later may upgrade motors etc any recommendations on bang for buck motors up to he job need to lift 3kgs including frame ?

Thanks again Tim

I would have thought something like this should be good:
http://www.hobbyking.com/hobbyking/store/__29414__Turnigy_Aerodrive_SK3_4240_620kv_Brushless_Outrunner_Motor_UK_Warehouse_.html
I';ve used the SK3 series motors in Planes and found them to be superb value for money and pretty reliable, they';re a nice well made motor (and are built by the same manufacturer in China that makes the Hacker motors).
I think..........I think I am........therefore I am.............I think!

tleibe