Florianopolis wrote:But turboprops have been sprouting more propellers?
strfyr51 wrote:Florianopolis wrote:But turboprops have been sprouting more propellers?
Those airplanes are nearly 30 Years apart. Technology has Certainly advanced between when the 3 bladed C130 was introduced and the 5 bladed
Herc was introduced One has the GM -Allison T56 engine and the other, The Rolls AE2100 (I think).
OldAeroGuy wrote:Wing aspect ratio can't be generalized to engine fan blades.
The cowling interior wall acts an end plate/super winglet suppressing the tip vortex. The physical dimension of a fan blade does not reflect its operating induced drag characteristics.
727glasair wrote:There are many factors to be considered when designing the most fuel efficient fan blade arrangements. One of them is called PROFILE DRAG. The fewer the blades, the less profile drag. That also applies to airplane propellers. Generally, the fewer the blades, the more efficient. But more blades promotes smoothness and less vibration.
Florianopolis wrote:Balerit wrote:Just look at how the aspect ratio has changed.
Isn't a high-aspect airfoil better, though?
OldAeroGuy wrote:You can't say that the GE9X weight increase is due only to the fan and containment ring. Its core has the highest compression ratio of any engine. Creating and containing the higher pressure can increase weight.
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