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Old 11-03-2019, 01:45 PM
  #5  
erh7771
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Originally Posted by mr_matt
Drag goes up as a square law. You need 4 times the thrust to go twice as fast.

So all else being equal (very important point), the 42 pounder will only be 15% faster.

I can't guess what ducting would do for drag, but I would never run anything open with one of these giant rectangular cross section fuselages. I myself might make a single duct/bypass, discretely block the other inlet and run a single turbine out one is the outlets.
+1

The extra static thrust would help most with verticals vs straight speed.

With full ducting the EDF Byron F-15 Lock has now goes into the 140s 150s iinm, not sure it can get up there without the ducting.

Last edited by erh7771; 11-03-2019 at 01:56 PM.