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The turbine blade rotates with a speed of 600 rpm and has a hub diameter of and a blade chord of , allowing operation with a blade flexure angle of ±45°.
This allows the blade to flex less than the speed of sound, reducing the noise of the turbine to between 4 and 16 dB.
The factory maximum rated power output is , but modern designs, most notably the Safran SA250-1 turbine, will generate with the best conditions.
The HAF 727 has had three main variants, with power outputs ranging from 860 MW to 933 MW.
The first three versions were three-bladed, with the last version (since phased out) having a fourth blade in the base of the fan.
The first production variant, the HAF 728, entered service in 1966, generating 200 MW at an efficiency of 0.81, and was followed by the HAF 729 in 1968, generating 200 MW at 0.82.
The first phase-out took place in 1986 when the HAF 729 was replaced by the "HAF 740".
The HAF 740 was equipped with a fourth turbine blade, giving it a total efficiency of 0.78, and a maximum output of 360 MW, but this was later increased to 500 MW.
In 1992 the HAF 740 was phased out and replaced by the "HAF 740-0".
The "HAF 740-0" was a major overhaul of the HAF 740, with the number of blades increased
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