can anyone give me an idea what should be the weight to thrust ratio in a quadrotor???

as i know
1. total quad weight = 2 x total thrust produced by motors.
It will make your quad to do some arobatic stunts,flips etc.
2. total quad weight = 1.5 x total thrust produced by motors.
It will make your quad to hover and normal flight.
EDIT:
You will have two options
1. Reduce total weight of quad by using light material without losing its strength.
2. Increase more thrust by motor and prop combination.low kV motors and big props having more pitch give more thrust to quad.

@dharmik
                Isnt it the other way round??

@coolpratheesh
can't say about other ways mate, experts can have better answer but battery also plays important role. With same motor prop combination 2S and 3S lipos generate different thrust values.

@dharmik i mean to say shouldnt the Thrust produced br 2 x the weight of the craft

thnq for ur valuable information..............im using 880kv motors,30 amp esc's,10*4.5 propellers,turnigy nanotech 2200mah 3s lipo................the overall weight of quad is 990gm including all components(battery,motors, frame etc).....can any one tell me what would be the flight time of my quad.................
can refer the below links of my components........
http://store.jdrones.com/product_p/ac1045bl.htm
http://store.jdrones.com/product_p/ac2830358.htm
http://store.jdrones.com/product_p/jdesc30amp.htm