[AR] Re: airbreathing engines (was Re: Re: to the stars, soon)
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Sun, 3 Apr 2016 18:33:12 -0700
You aren't trying to compress much at all with the main fan, just move air.
There is a whole bunch of compressor stage equipment behind the fan, after the
airflow is split, handling all that. Usually on entirely different spools on
modern engines.
George William Herbert
Sent from my iPhone
On Apr 3, 2016, at 1:46 PM, qbert@xxxxxxxxxxxxxxx wrote:
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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