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EDF and Pusher Jet Builder's Support

Old 04-15-2016, 04:55 PM
  #26  
quorneng
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jibwalker
It is the area of the EDF minus the area of the hub not the diameters.
In your case the area of the EDF is
Pi x 27 x 27 / 4 = 572 sq mm
The area of your hub is
Pi x 14 x 14 / 4 = 153 sq mm
The FSA is 572 - 153 = 419 sq mm
85% of that is 356 sq mm.
Doing the area calculation backwards from that gives a diameter of 21.3 mm.
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Old 04-16-2016, 01:07 AM
  #27  
TimMartel
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Default Impeller for Turbo Hawk

Thank you Don.

Tim
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Old 04-16-2016, 02:09 AM
  #28  
birdDog
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For those of us, like me, who abhor maths.

http://www.calculator.net/area-calculator.html
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Old 06-01-2016, 11:52 PM
  #29  
EFFlyer
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Originally Posted by birdDog View Post
For those of us, like me, who abhor maths.
I used SketchAndCalc to calculate the surface area of my EDF along with various other irregular shapes:

http://www.sketchandcalc.com

Watch the video on the homepage first... might save you some time
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Old 06-02-2016, 12:26 AM
  #30  
birdDog
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Build a jig for your thrust tube. One plug is sized the diameter of your fan shroud exit and the other plug sized to your preferred exit diameter. Space these on a dowel to the exact length you want (or scribe a line). This is also handy for trimming the duct square.

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Old 06-02-2016, 12:29 AM
  #31  
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Now that's clever ! Thanks !

Hawk
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