Have just seen a YT vid where the standard Tello propellers have been replaced with 3 bladed Q90 King Kong props. Didn't seem to affect the performance, except may be some increase in motor temperature, but it was noticeably quieter; flight time was about what I get (well under 13 mins with prop guards on). Personally I would trade off noise for shorter flight time, and plan to try these Q90 3 bladers. Bookworm