An internal-combustion engine needs four things to run. They need fuel, mixed with air, in a ratio of 14.7 to one. An ignition-spark lights the fuel and air mixture, creating combustion. Compression of the fuel and air mixture makes it explosive. The final necessity is proper timing, of the components.
1 The length of time it takes for eggs to hatch after incubation begins depends on the species and temperatures. 2  For bluebirds, it USUALLY takes about 12-14 days from the date the last egg was laid.3  Different species have different incubation periods, which can vary within a species due to temperature inside the nestbox. Depending on when incubation begins (on the last, or next to last egg), eggs in the same nest can hatch a day or several days apart. 2  It also takes a while for the bird to break through the shell. 3  It could be a new egg from a subsequent nesting if you didn't clean the box out immediately after the last fledging.
Eggs are moved from the incubator to a hatcher at 46 days. They will hatch from 48 days to 52 days. The hatcher has compartments for each egg-chick and is the same temperature/humidity as the incubators.mu Egg Incubators At The Emu Oil Depot These incubators will hold 84 eggs and are turned automatically. There are three shelves of 28 eggs each. Smaller, less expensive incubators will turn eggs too, but only by tilting the shelves 45 degrees or so and that isn't enough.