回复：手持1/25 太难了，我一般都不低于1/150。在地上拍时可以用脚架，速度可降低点。

Ask the pilots to keep the same speed and position.  You could use the seatback etc as the support.  This is the best way to get very 漂亮的螺旋浆动感.

If it is very bright day, please remember to bring a ND filter to enable the slow shutter speed.