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Old Feb 24, 2013, 12:30 PM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
4,233 Posts
FSA is the total area minus the center body. If it's the same one that comes with ZD fly stuff, it's outside area in mm- 5273 minus the motor mount area- 854 = 4423, or 6.7 in inches.
80% of that divided by 2 for the twin ducts = 2.68

That fan has lots of blade area and low pitch. It should be a good one for difficult ducting.
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Old Feb 24, 2013, 12:56 PM
Airplane crasher
CapMike's Avatar
USA, CT, Shelton
Joined Jan 2008
2,732 Posts
Steve if I understand you correctly then my inlet and outlet ducts can both be 2.68" diameter? This whole ducted fan thing has me confused. Its not like a prop plane where I can plug in some numbers and get a pretty close idea of performance for a given airframe. Here is a link to the plane the EDF came from. Not the exact but an early version of this plane http://www.bananahobby.com/grey-f-16...1399-prd1.html
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Last edited by CapMike; Feb 24, 2013 at 01:13 PM.
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Old Feb 24, 2013, 07:42 PM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
4,233 Posts
No, I was talking area. Since it's your first edf, you should probably go for plenty of intake area, so 2in by 1.5 inches would give you 3 square inches per side for example.

The plane in the link has a 6 blade 70mm fan, so different?

If your not too worried about having a perfect scale airplane, you could use an oval or pinched oval exhaust at the back- sorta figure 8 on it's side, but not touching in the middle. You'd be making life much easier on yourself since you could roll it out of anything instead of having to make a fiberglass plug. Just a thought.

Steve
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