DUCTED FAN vs TURBOJET
DUCTED FAN vs TURBOJET
(OP)
I am looking at the feasibility of a light (100 kg) low-speed (100 kt) unmanned aircraft, similar to those used by the military for drones, reconnaissance etc.
Most of these use small turbojets but I am considering using a ducted fan driven by a 4-stroke IC engine. What are the pros and cons? I guess fans are bigger diameter, but I don't know enough about limiting factors such as tip speed.
Can anyone point me to a useful source of data?
Most of these use small turbojets but I am considering using a ducted fan driven by a 4-stroke IC engine. What are the pros and cons? I guess fans are bigger diameter, but I don't know enough about limiting factors such as tip speed.
Can anyone point me to a useful source of data?





RE: DUCTED FAN vs TURBOJET
RE: DUCTED FAN vs TURBOJET
RE: DUCTED FAN vs TURBOJET
Insideman:
We may be interested in getting you to help with the feasibility study / design. Please email your details to:
john.harris@marshallsv.com .
RE: DUCTED FAN vs TURBOJET
http://www.aurora.aero/gallery.html
They have built a ducted fan drone (I think they call it "Golden Eye"), with pretty impressive "advertised" performance. I have seen pictures that they have built one, but not actually flown it. The concept is a ducted fan, driven by a rotary engine.
Let me know what you think.
Regards,
Grant Wittenborn
Aerospace Engineer
www.darcorp.com
RE: DUCTED FAN vs TURBOJET
Here is a good reference, US patent #4,996,839. It's a patent for a ducted fan driven by a piston engine. Teledyne was evaluating such a configuration for long range, subsonic cruise missile propulsion.
You can also try this link:
http://patimg1.uspto.gov/.piw?Docid=0499...
Regards,
Terry