Ducted fan aircraft

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henryk

Well-Known Member
Joined
Mar 8, 2010
Messages
5,202
Location
krakow,poland
We're talking about different things - open prop vs ducted fan.
-yes,ducted fan is another type of propeller(generator of thrust force),but both are working on the equal phisical principes...

-ducted fan inside of the fuselage have small diameter
=low specific thrust (big specific power/thrust/surface !)

conterrotating fans can help with this problem...

see todays turbofans (conter rotating too).

f.e.=
https://www.dlr.de/bt/en/desktopdefault.aspx/tabid-8196/14020_read-35636/
 

Malish

Well-Known Member
Joined
Oct 11, 2013
Messages
524
Location
Russia. City of Volgograd
We did move our airplane from large airport of Volgograd to a small field with grass runway about 3000' long. Russian aviation authorities didn't want us to fly our test flights in this large airport.
But, what it's makes things better, if we could fly our aircraft from this small airfield with short grass runway, PJ-II "Dreamer" will be even more attractive for potential buyers.P6191908.JPG
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Malish

Well-Known Member
Joined
Oct 11, 2013
Messages
524
Location
Russia. City of Volgograd
Today we finished assembly of our aircraft and did some high speed runs on grass runway. New landing gear and aircraft performed well.
We did run it up to rotation speed(95 km/hr) and it was no problems to get this speed in 250 meters(750 feet).
Also there was no problems with debris "sucking" into the airducts.
Tomorrow morning we will do some test flights from this airfield.P6201913 (Large).JPG P6201916 (Large).JPG P6201917 (Large).JPG
 

Doggzilla

Well-Known Member
HBA Supporter
Joined
Jun 2, 2013
Messages
2,289
Location
Everywhere USA
Hey Malish, what are you getting for your static thrust?

I was checking out the Martin Jetpack after they recently went out of business and was surprised to see their ducted fans produced the same thrust as a prop for the same HP. Over 700lbs with 200hp, the same as a 200hp Cessna with prop.

The patents are all almost 30 years old, so most of the patents are expired. You may find them useful, depending on your power to thrust ratio.
 
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