OK, Elguano.ElGuano said:You want to look for "9443" propellers. You're right that they are 9.4" long, but everyone just calls the 9". Just go by the model number.
The 9443s are louder than the 8045s; there are some trade offs for the longer flight times. The heavier the quad, the harder the motors run, the more air the props displace; the louder the volume. Until we get some Special Forces skunkwork props going, that's probably not going to change much.