http://cradylab.com/apm-broken-usb-rescue/
https://technet.microsoft.com/en-us/library/ff394947.aspx
https://yadi.sk/d/IGVyvovx3Nf5sS
https://oscarliang.com/choose-propellers-mini-quad/
There are 2 types of format that manufacturers use.
L x P x B or LLPP x B
L- length, P – pitch, B – number of blades.
For example 6×4.5 (also known as 6045) propellers are 6 inch long and has a pitch of 4.5 inch. Another example, 5x4x3 (sometimes 5040×3) is a 3-blade 5″ propeller that has a pitch of 4 inch.
“BN” indicates Bullnose props.
Sometimes you might see “R” or “C” after the size numbers, such as 5x3R. R indicates the rotation of the propeller, which stands for “reversed”. It should be mounted on a motor that spins clockwise. C is the opposite, should be used with motors that spins counter-clockwise.
https://top-10-drones.com/blog/choose-motor-propeller-quadcopter/