hi frnds i have a dought with my aelous 50 3d blades
shall i have to tight the screws of blades or loose (main blades and also tail blades)
iam thinking that to loose the screws as centrifugal force act on it is it right?
or shall i tight them totally

First change the topic heading to 'doubt' instead of dought.

Next, if you hit the blades gently (don't slap it too hard) with an open palm, it should travel about 45 degrees or so. Not too loose and not too stiff. All the best.