brushed motors are useless

have tried every possible way to take all the juice brushed motors have got but was unable to lift my quadrotor,just because weight to thrust ratio is high

quadcopter build

work started to build a quadcopter using brushed dc motors and DIY props.

looks like the brushed dc motor is not having enough torque
to give the required thrust.
the weight of model is 250 grams ,and is decreased to 147 drams after full speed of motors.