Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by jthunt, Mar 17, 2012.
Great videos of a neat airpane!
The UL-39 Albi, the "jet" ultralight motorized Version
Published April 24, 2016 by Editor 0 Comments
A replica of L-39 Albatros carbon fiber, powered by a BMW engine driving a "fan" is the microlight market ...
Presented in Friedrichshafen on the stand of the Czech manufacturer Skyleader - known for his series of two-seater microlight Skyleader 100 to 600 and its subsidiary JIHLAVAN Airplanes which took over the facilities of the former manufacturer Kappa in 2005 - UL-39 is Albi taking a tandem scaled silhouette of military training aircraft L-39 Albatros, used among others by private and civil patrols. The prototype made its first flight on April 4, at the hands of Radim Sterba.
The design is due to Professor Robert Theiner (Ustav Letadlové techniky), with a university project conducted over nearly 17 years. JIHLAVAN always had ties, especially when developing ULM / LSA Skyleader with aerospace Institute dependent Brno University of Technology, but also with the Technical University of Prague.
The UL-39 is made of carbon fibers, JIHLAVAN spot of technical resources in the field of composite materials, especially realizing the doors of the Airbus A320 and subcontracting for various certified aircraft manufacturers. The UL-39 two-seater, boasting a returning train is powered by a BMW driving a "fan" with 13 blades, with a diet of over 10,000 rev / min cruise. The designation (UL) indicates that the manufacturer is the microlight market to the European with a maximum weight of 472.5 kg at takeoff. ♦♦♦
Image and video via AirZone.TV
Here is the photos of flight of PJ-II at Sun-n-Fun 2016
-have anyone video with Dreamer fly at Sun&Fan ?
Someone said they have video. As soon I get it, it's will be published.
For now more photo's from Sun-n-Fun:
-s PRAZDNIKOM !
Malish, how does the performance and fuel consumption of this design compare with using the same engine with a conventional propeller?
Where exactly would you stick a propeller on an aircraft that looks like this. The idea here is to have plane that looks like a fighter but does not need a government budget to fly. The efficiency of a prop plane against a fan is not the issue here.
Just putting things into the right perspective.
Malish, you did a great thing for the benefits of Experimental Aircraft fans all over the word. CONGRATULATIONS
You're missing the point of my question entirely.
Surely Malish and others have run some basic numbers on thrust of such a ducted fan configuration with a given amount of horsepower, vs. using the same horsepower to turn a propeller.
Granted, there are pros and cons of either configuration, and a lot of variables, but I'm wondering if you have X horsepower from the engine, what's the comparative thrust if used to drive ducted fan(s) vs. turning a prop, all else equal?
And, is it better to put the torque of the engine into one larger duct, or two smaller ones as seen in this plane vs. the Czech plane?
Could be, Malish's application of engine torque to two fans is more efficient use of power than either the one duct of the Czech plane, or even perhaps than if applying to torque to a propeller.
No way to compare it. Ducted fan is different propulsion system. I our case it's makes aircraft look and fly like a jet.
Side bonus of extra safety on the ground by preventing prop strikes against bystanders and debris.
So how did you like the weather back in America? :grin:
I think Malish already knew what to expect. He lived in Atlanta in the 80's.
Might prevent a prop strike on the runway but how is debris prevented from entering the prop disc?
This airplane for hard surface runways only. It's like a jet aircraft can "swallow" any debris from the ground. We always avoid to taxi or takeoff from dirty runways.
Hello dear friends,
unfortunatelly seems that Albi had a problem during test flight...
UL accident in LKCS
So far is text only in Czech langauage, but incl. video and photos.
I will try to find more details.
Mi no Gusta.
Could it be they were testing the parachute system to determine aircraft safety during canopy deployment..?
Although, the nose down position does not look good for a parachute safety system design. There are better ways to save an aircraft with a foil canopy.
Not likely, at that angle not going to be a happy ending.
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