Motors

[NidheeshJain]

Aim : To achieve around 4:1 thrust : weight ratio.

Even if you only just planned to fly a slow and stable aerial photography rig, you should aim at somewhere between 3:1 and 4:1 ratios. This does not only give you better control, but also provides room for extra payload in the future.
Source : Oscar Liang

What we know :

• The quad will itself weigh around 850 gram without battery.
• 4s 5200mAh battery weighs around 500 gram.
• The extra hardware for SLAM is expected to weigh around 600 gram.
• We can't use Propeller more than 10inch in Size for our current frame

[NidheeshJain]

SunnySky V3508 580kv - 1247 Props at 500g draws 3.4A Max thrust - 1360g / 1247 prop / 15.4A / 5.97(Efficiency) (Approximate theoretical Flight time - 20min)

Racerstar Racing Edition 3508 BR3508 700KV - Max thrust - 1700g / 1238 prop / 22.6A / 5.1

Racerstar Racing Edition 4108 BR4108 600KV - Max thrust - 1450g / 1238 prop / 17.2A / 5.7
Same kind of Discussion on RC-India Best brushless motor to give maximum thrust

[nepython]

EMAX-MT-0081-MT4008-600KV 1238 Props at 500g draws 3.8A Max Thrust - 1460g/ 1238 prop/ 16.9A /5.8 (Efficiency)