Warp factor needed

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Here you go, very quick and somewhat exaggerated, but I’m sure you get the idea.

5 Likes
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That’s the way I obtained the blades in the last fan model I made, but, as you might be able to tell from this png, it resulted in aberrations in the contours of the blade’s thickness. I could never get them to “close”.

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But mainly, It’s inadequate in that the radial beginning and end of the blade are at the same angle, whereas this project requires that the blade’s angle from the rotation plane decreases with the distance from the propeller’s rotation axis.
Try saying that with a mouthful of crackers…

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When you drew the circles did you offset one or did you draw two separate circles?

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I drew two separate circles.

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I created two warped surfaces that extend radially from a cube. The inner part of the blade is flat with a bit of a curve on the outer part:

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I distorted this a bit to accommodate the blade shape:

End result:

fan.skp (643.4 KB)

The parallel warped surfaces were created using the Spirix plugin.

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I’ve managed to sort out the central hub, but the result isn’t as clean as I’d like it to be. There are distortions, mainly along the contact points between the core and the flanges. Also, the surfaces of the flanges produce jagged lines when intersected.

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The propeller blades’ll fit on these flanges, but my 3 methods used to produce them failed. I’ll have another go at Spirix, but my previous attempt to use this was unsuccessful.
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It’s easy enough to use Spirix to create a pair of helical surfaces that can be intersected with a blade contour. Here’s an example: https://www.youtube.com/watch?v=lXhWQFT-hgc

2 Likes
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Thanks for this; I’ll have another go…

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Gave it another go; Managed to warp the propeller, but it only looks good from certain angles. I’ll tackle the counter-bend tomorrow, but I can’t say I’m delighted with the results up to now. Spirix seems to be a better tool, but I can’t make any headway with its UI…

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That’s the problem I had with the faces distorting. I did manage to find a half decent compromise when I had a go. I think Spirix could be the way to go. Jim Hamilton’s done some great examples lately with it, I haven’t tried it but I’m sure you could get a great result with a bit of practise, trial and error. (and maybe a dollop of luck :smiley:)

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