Project: Yuri II

After Yuri I, came Yuri II from the Nihon Aero Student Group (NASG). There are no reports of it having achieved lift off. Any more information on this project would be greatly welcomed.

Video #1 of Yuri II
Video #2 of Yuri II
Video #3 of Yuri II

A japanese website has information, photos and videos about Yuri II. http://www.torippa.org/reports/008.html Here is a translation (with the help of translate.google.com): 

"From December 22nd, 1998 to the 24th, at the gymnasium of the Nihon University Department of Science and Engineering which is in Chiba prefecture, Funabashi city, a project of the Nihon University Department of Science and Engineering aerospace engineering course 3 laboratory executed the test flight of human powered helicopter “YURI II”.

This was the first real test placing the pilot in YURI II. Regrettably, on the last test, the aircraft did not lift off. The fuselage was stable, but blade 1 was broken with the test on the afternoon of the 23rd.

The YURI II was the successor of human powered helicopter model YURI I which succeeds in the flight of 19.46 seconds on 1994 March 7th. With combined research project of the Nihon University Department of Science and Engineering aerospace engineering course 3 laboratory, as for the member who participates, 9 students, 2 graduate students, 17 total 6 of teachers. Also, Akira Naito, leader of the YURI I project, participated as an adviser.

The design differs greatly from the YURI I. With YURI I of the first generation, it had reached the point where the pilot boards to the center of four rotors, (Figure 1). YURI II differs from this largely, with 1 rotors of 3 blades, takes the mechanism where the propeller which to the respective blade point is, turns the blade, (Figure 2). 1 the machine and 2 the fact that structure differs largely with the machine is because it is the experimental aircraft in order to overcome the technical topic where these fuselages differ respectively.

There are times to which last goal of project was set the American American Helicopter Society (AHS) by, acquires international human powered helicopter prize “[shikorusuki] prize”. As for [shikorusuki] prize, satisfying the condition which AHS sets, being something where, 20,000 dollar is sent vis-a-vis the human powered helicopter which flight it does since being set by 1980, yet as for the prize-winner it is not. In the condition which AHS sets with “the fuselage continues surfacing 1 minutes in 10m angle, at that time the lowest section of the fuselage are times when even at instant from the land it reaches to the height of 3m”.

With YURI I, by the fact that the floating effect is utilized skillfully, the human powered helicopter stabilizing, the fact that it can surface was proven. But, with stipulation of [shikorusuki] prize it is necessary to exceed the height of minimum of 1 times 3m, in this case it cannot expect the floating effect. In addition, when it becomes 1 minute ones long flight, because the fuselage which is in the midst of flying is made to stabilize, the mechanism which controls the fuselage becomes necessary. In order to overcome these topics, with YURI II, the blade is arranged in the upper part of the pilot, influence of the floating effect decreases, the flap for fuselage control is arranged in the point of each blade. In addition, the fuselage central part as for the seat which has been overturned, near the blade center making use of erupting the air, those in order even a little to make lift. It calls “rise washing sale”.

In the future it plans also record flight. As for the fuselage weight of YURI II approximately 30Kg, as for the pilot 50Kg is strong, length 1 of blades approximately 10m. Being something which locks the spruce material with the styrene board in the beam of the blade, it uses the deformation type of the DAE series to the airfoil section. As for the pilot with student 3 of laboratory post, as for special muscular strength training you say that it has not gone. In the future test flight it repeats detailed adjustment, is at the stage where flight has become possible duration of flight and the schedule which challenges to the record of height it is."


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