Question
Fan Sweep Area question...
I have heard many different percentages of exhaust diameter to Fan Sweep Area . My question is this...
Do you take the FSA and take the percentage and work forward OR....
Do you take the the FSA, work forward and take the percentage of the final number....??
I am trying to come up with an exhaust tube diameter for the 65mm fan in my Sapac Eurofighter. My fan sweep area is 3002.62. If I then devide that by 3.14 it gives me 956.25. The square root of this gives me 30.92 , the radius, which then yields for all intents a 62mm diameter cone. Going %85 gives me a 53mm outlet.
If I take the 3002.62 sweep area and take the %85 , this gives me 2552.23.
Dividing that by 3.14 gives me 812.812, the square root which gives me 29mm the radius, or 58mm diameter.
2 different ways giving me 2 different answers.