I weigh the blades I put any necessary weight in the middle around the balance point . When I made the blades I selected stock that was very close in weight and therefore I did not require much balancing.My balancing is from tip to hub. The construction is per instructions in Kellet kit. I have a piece of alum stock that is 2 1/2 inches wide 36 inches long and 3/4 inches thick I build the blades on this and use rubber bands to hold the material while the epoxy cures.My blades are FLAT and TRUE.Today I made flight number 104 A gust of wind came up just as I started and I had a true vertical takeoff WOW It climbed up no more than 10 ft in front of me