what should be the motor specs. to lift around 1.2 kg?
http://www.hobbyking.com/hobbyking/store/uh_listCategoriesAndProducts.asp?idCategory=521
hope you get what u want
i know that site..i have a doubt that to lift 1.2kg should each motor hace capacity of 1.2kg or 4 combined i.e 300gm each?
To lift 1.2kg(1200 grams) you need 2.4kg(2400 grams) thrust means 600grams from each motor. 600kV to 900kV motors would be best.
for a quadcopter for lifting 1.2kg , i would suggest dt700 from hextronik , these are real good with 10x4.5 they give around 890g of thrust, current 14amp. max (with my test result).
even on a tricopter they give a total 2000g+ thrust with same prop as mentioned above.
Really cheap too.