On Sun, Mar 16, 2014 at 08:00:02PM +0100, Onno Meyer wrote: >The problem is that they don't really look like ducted fans. >How fast has the air to go through those little nozzles?
Each square metre of nozzle/rotor/etc. exhausting air at jet engine speed can provide about 10kN of thrust*. A full-up Apache at 10,433kg (MTOW) would need 10.4m^2 of exhaust area to get off the ground. (Its actual rotor has an area of 168m^2, so it actually needs to throw air downwards at only 22m/s.) What's the MTOW of the vehicle? * thrust/area = airdensity * speed^2 modern jet engine exhaust speed = ~200mph standard air density = 1.225kg/m^3 _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
