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Old Oct 08, 2012, 06:50 AM
Odysis is offline
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Life begins at transition
Australia, VIC, Sale
Joined May 2007
3,593 Posts
EDFs do compress air. How much by? Let's find out.

Something like an SM89-45, with a 4771mm2 fan area, putting out 4.5kg thrust with a 100% FSA exhaust.

4.5kg is 44.1N, 4771mm2 is 4771e-6m2. Simply, the pressure change is
dP=F/A
dP=44.1/4771e-6
dP=9243 Pascals.

For those not into SI units, that's 2.7inches, or 1.3psi, or around 1/10th of an atmosphere.
So, it's got a pressure ratio of 1.1. Not enough for the job at hand, but nothing to be sneezed at, no?

Three inline would obviously give around 1.33 ratio, but huge amounts of power.
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