[AR] Re: airbreathing engines (was Re: Re: to the stars, soon)

  • From: qbert@xxxxxxxxxxxxxxx
  • To: arocket@xxxxxxxxxxxxx
  • Date: Sun, 03 Apr 2016 14:46:08 -0600

At 01:37 PM 4/3/2016, you wrote:


Makes me wonder why smaller "traditional" ducted fans (like on airships or the E-fan aircraft) have much fewer blades, not a big blade disk like a turbofan.


Ducted fans at the RC level are designed for thrust, after X number of blades you reach a minimum gain. In most of the high power ones it's around 12. In an actual turbo fan system you need to compress the air and for this, to few blades and you can't get the high compression needed to get to jet part of the system running at optimum efficiency.

Robert


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