Timer model of helicopter class F4F

grabcad

Blades and hubs for 3D printingThe large blade consists 3 segments along, the blades are hollow and there is drainage for draining.For a smaller propeller, the hub is 2 blades, for a larger the hub provides 2,3,4 blades - static balancing of both assembled propellers is mandatory! Mounting the hubs to the output shafts of the gearbox is at your discretion. The pitch of the blades of both screws can be changed to 3-4 positions.Model helicopter class F4F (in the international classification of aircraft models). This class is liquidated as "very inefficient".Instead of a fish, you could use a bunny or a Mickey Mouse ...The piston engine is replaced by an electric motor which, according to the conditions of the competition, runs for 15 seconds ... The batteries in the shaft pipe should last about the same time ... Everything is very serious ... Well, water for fish, how without water? :)