which props should I use for a sport flying? 3D flying?
And which company's props is the best?

Thanks for the helpers.

12x6 for sport and 13x4 for 3D. I perfer APC brand.

For funfly or 3d my choice is apc 12x4 or 12.25x3.75 on the 52xls - I like the 12x4 slightly better.

i have the O.S.52 and i use a 11 x7 scimitar for sport flying. the 12 x 6 apc is a great prop and i have a few of those also for sport flying. for 3D? wouldn't know... can't imagine using the 52 for 3D. but if i had to guess, a 13 x 4W would be a good choice.

I also have ab OS52 in a Smith Mini Plane and ended up with an 11x6 APC after trying others.

forgot to mention, i fly with 30% cool power.

12x4 shoud be the best make called masterairscrew