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GE Aviation bought the Czech company Walther to get their 600-800shp turboprop engines, now called the H75... On their website, two thirds down the page, the following picture has the caption

The H-series engines use blisks made from a single piece for the engine’s two axial compressor stages reduces component weight and part complexity

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Is this a blisk?

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  • $\begingroup$ 100% not a blisk. I work with them on a daily bases. That is a disc with blades. $\endgroup$
    – Notts90
    Jun 14, 2018 at 15:12

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From Wikipedia's blisk:

A blisk (portmanteau of bladed disk) is a turbomachine component comprising both rotor disk and blades. It consists of a single part, instead of an assembly of a disk and individual, removable blades. Blisks may be additive manufactured, integrally cast, machined from a solid piece of material, or made by welding individual blades to a rotor disk. The term is used mainly in aerospace engine design. Blisks may also be known as integrally bladed rotors (IBR).

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Figure 1. This device is clearly made up of many pieces.

I can't see how this could fit the Wikipedia definition so as far as they are concerned this is not a blisk.

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  • $\begingroup$ Your cited definition says blisks may be "made by welding individual blades to a rotor disk.". You need to provide a source that shows these blades are removable, and not permanently fastened, now or at some later stage in the process. $\endgroup$
    – user71659
    Jun 13, 2018 at 23:17
  • $\begingroup$ For comparison here is a one-piece blisk. $\endgroup$
    – user14897
    Jun 14, 2018 at 2:22
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    $\begingroup$ @user71659: I don't think I need to do anything. Feel free to copy and improve. $\endgroup$
    – Transistor
    Jun 14, 2018 at 6:11
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    $\begingroup$ @user71659 them blades are very clearly not welded. Once a blisk is welded and cleaned up you'd never know it wasn't once separate bits of metal. You also don't use the dovetail design for a welding blade's foot, you use it on removable blades. $\endgroup$
    – Notts90
    Jun 14, 2018 at 15:16

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