I notice that in Trent700 engine fan blade there is no curve extension at the tip unlike in other engine's fan blades such as the GE90 ,T900 etc.

What are the purpose of it?

enter image description here

Trent 700 without forward swept blade tips

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Engine with forward swept blade tips

  • 3
    $\begingroup$ These two images look to be exactly the same? $\endgroup$
    – Ron Beyer
    Commented Jan 19, 2017 at 5:58
  • $\begingroup$ Do you mean the tips of the blades are swept forward in some parts of some engines but not others and you want to know why it's done? $\endgroup$
    – Notts90
    Commented Jan 19, 2017 at 6:48
  • $\begingroup$ This may be about the absence of mid-span snubber. $\endgroup$
    – mins
    Commented Jan 19, 2017 at 8:01
  • 3
    $\begingroup$ Hello Ajas, welcome to Aviation.SE. I have edited your question by including the Trent 700 image from your duplicate question and clarifying the question. I hope it now reflect what you wanted to ask. Please don't post duplicate question, instead use the <edit> link below your questions to make clarifications if needed. Could you also add the photo source and credit the photographer below each image? $\endgroup$
    – DeltaLima
    Commented Jan 19, 2017 at 8:33
  • $\begingroup$ I have another question: why are the tips here forward swept, but not swept backwards like the wing? What are the differences in aerodynamic properties? $\endgroup$
    – Frank
    Commented Jun 19, 2023 at 10:55

1 Answer 1


Increasing performance of the fan means making it rotate faster. Tips of the fast-rotating fan travel at supersonic speeds. This design of fan blades is to overcome blade stall and to increase effectiveness of the fan. The design is probably patented and that's why it doesn't show up on engines of other manufacturers.


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