Aircraft Arresting Barriers
Here is the first UOTILA-24 Barrier Net at Kuopio Airport in Finland just installed in August 1984. The span reaches over 60 m runway and weight totals half a ton. It is constructed of 24 structurally independent nets, having a vertical tape located each 2.4 meters. When each individual net is shifted 0.1 meters horizontally from its neigboring net, the result looks like a one net having vertical tapes at each 0.1 meter intervals. The reason for this arrangement is to provide a smooth and even grip on the aircraft wing, which is the strongest part of the aircraft. Namely, when entering the net, the nose of the aircraft slips through the vertical tapes and the arresting forces of the net act on the wings only. See below the MiG-29-arrested-photo for more live details of the net. The theoretical breaking strength of UOTILA-24 is 480 tons (new) and the predicted service time over 5 years.
After 5 years of outdoors service, this same UOTILA-24 net captured safely a Russian MiG-29. The MiG-29 made an unsuccesful landing attempt during an airshow at Kuopio Airport in August 1989. The plane did not suffer any damages and it flew next day back to Russia.
Since then a total of 22 UOTILA-24 nets have been delivered to the Finnish Air Force.
The weather conditions in Finland are quite varying and require a lot from the net materials. Another UOTILA 24, this time at Kuorevesi Airport, Finland.
Aircraft Arresting Barrier Systems
The Arresting Barrier Net UOTILA 24 has been added with the braking units of 30 Megajoules capacity plus other necessary apparatus to make a complete portable Aircraft Arresting System UOTILA 30. The whole system is built into a truck container. Here is a photo of the UOTILA 30 System set up at the Turku Airport, Finland. The system requires concrete anchoring to ground plus apparatus for mast support, brake unit force anchors to ground and such.
The texrtile brake units for this use have progressive forces for smoother deceleration of smaller aircraft / lower entry speed. After a certain braking distance the braking force increases to facilitate also arrests of larger aircraft / higher entry speed safely within the specified arresting distance. Below is a photo of a single textile brake unit under test with a 17 ton tow truck at its maximum speed of about 115 km/h or 70 mph. The heavy truck was stopped without any braking aid of its own, corresponding to the absorbed textile brake capacity of over 8 MJ. After this stop there was still remaining about half of the full capacity of this one UOTILA textile brake unit. The system has brake units attached on both sides.
The truck did not "bounce back" at all after stop, which can be verified from the video. The QuickTime/Cinepak-video shows 5 frames per second, is 15 seconds long and has a size of 2.1 MB. It is uncompressed for simplicity. Click the photo below to start downloading the video to your computer.
The video requires a QuickTime to play. In case you don't have it, the latest version of QuickTime can be obtained from here.
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