My quadcopter is V type frame.

Motors Emax 2213 / 935KV / 1045 props

Slightly soft props, not much like phantom but they are not rigid 

4000 Mah 3s Lipo

APM 2.6

total weight of quad copter = 1600 grams

giving only 9 ~ 10 mins in a no wind condition and mostly loiter / hover 

How can i increase my flight time (i cannot reduce the weight more)  ??

suggest me motor / prop upgrades .

Thanks 

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Depends on the largest size of props your frame will handle, if you can get 15" props on, then swap your motors to 350-500 kv pancake motors, and double your batteries up, you will get at least 20mins....

Obviously it will need to be retuned, and be no where near as acrobatic, but it depends on what you are after....

Thank you Dave for the reply.

Can you please guide can i continue my 3s battery setup and ESC if i change to 500kv pancake motors and 15" props ? 

Move to a 4s battery, get lower Kv motors, increase prop size, optimize lift target for 1.15x weight at the most efficient arc for your motor/prop combo.

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

Dear Michael 

Thank you for replying, can you please explain this in little detail 

optimize lift target for 1.15x weight at the most efficient arc for your motor/prop combo.

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