I have been flying for about 3 years now and am into a bit of 3D.

Recently I saw quite a few posts regarding prop balancing. Now, I have always used Master Air Screw on all my airplanes simply because they are less likely to break as compared to the more expensive APC. Also I always use K series props as their paddle design gives a bit more bite (I believe) over Scimitar series. But I have never balanced these props. For all my props, as soon as I get them, I deburr the sides with fine sand paper. This I do to remove the possibility of cutting my fingers should I finger start the engine. Just a little bit of sanding makes both leading and trailing edge smooth without rough edges. But I never check for balancing. I never had any issues with props. However on my Reactor and many other ARFs I see a lot of vibrations at idle. These cause all the tail feathers to vibrate hard but only at idle. One or two clicks of throtthe removed the vibrations. I always use good spinners (Dubro or GP with aluminium backplate) and they never seem to be unbalanced.

So my question is, how critical is balancing for these props?

Ameyam