DALPROP Nepal N2 T5142.5

The DALPROP Nepal N2 T5142.5 is a three-blade polycarbonate propeller for 5 in class FPV drones in freestyle use. The designation gives 5.1 in diameter and 4.25 in pitch with three blades.

A pitch of 4.25 in on a 5.1 in diameter lies in the middle range: less tuned for top speed than a racing design, but with more thrust reserve and gentler response to throttle changes, as freestyle with its aerobatics demands. Three blades give thrust and grip at a small diameter but lower efficiency. The weight is 4.2 g, the bore 5 mm and the hub height 6.5 mm. The propeller is not foldable. Thrust holds only for a combination of motor, voltage and speed.

Freestyle is flown in the open category, where the rules are: visual contact with the aircraft, no more than 120 m altitude, an observer with video goggles, and distance from uninvolved people. The class follows from the take-off mass of the finished aircraft, not from the propeller. From 250 g take-off mass the operator must register, and classes C1 to C3 require direct remote ID.

On selection: the 5 mm bore fits 5 mm motor shafts. Freestyle propellers suffer at blade tips and leading edges when trees, gates or ground are hit; bent or nicked blades are replaced, not straightened. They are changed as a set, with two propellers per direction of rotation kept ready, so that a damaged half does not change the behaviour of the whole build.