SE456813B

SE456813B - Arrester for propeller-driven aircraft

Info

Publication number: SE456813B
Application number: SE8700396A
Authority: SE
Inventors: Crister Stark
Original assignee: Crister Stark
Priority date: 1987-02-03
Filing date: 1987-02-03
Publication date: 1988-11-07
Also published as: SE8700396D0; SE8700396L

Abstract

The arrester has a lower edge cable (6), and between it and the upper edge cable (5) is a cross net (12) connected to both cables. The cross net (12) comprises thin wires of e.g. plastics forming two groups of parallel strands. The groups are angled w.r.t. each other forming points of intersection at which the crossing wires are joined. The cables are connected to drag lines (8,9). The wire groups engage the propellor or propellors of an aircraft, bringing them and its engine or engines to a gentle stop. The arrester can also be of single-use, destructible construction.

Description

456 813 10 15 20 25 30 35 2 samt ett undre kantelement 6, som företrädesvis vilar på flygfältsbanan 1. Kantelementet 5 är spänt tvärs över banan 1 och uppbäres av stolpar 2 och Ü medelst draglinor 8, som är fästa till stolpens 2,7 övre ände. 456 813 10 15 20 25 30 35 2 and a lower edge element 6, which preferably rests on the airfield runway 1. The edge element 5 is tensioned across the runway 1 and is supported by posts 2 and Ü by means of tow lines 8, which are attached to the upper 2.7 of the post End.

Det undre kantelementet 6 är via draglinor 9 lösryck- bart fäst till förankringspunkter 10 på marken vid sidan av flygfältsbanan.The lower edge element 6 is releasably attached via tow lines 9 to anchoring points 10 on the ground next to the airfield runway.

Draglinorna 8 är förbundna med stolparna 7 via en brottlänk 11, som brister och frigör draglinan 8 när dragkraften i linan uppnår ett visst värde. Draglinan 8 kan göras elastisk så att fångnätet 5 kan följa flyg- planet i uppspänt läge under en längre sträcka innan brottlänken 11 brister.The traction lines 8 are connected to the posts 7 via a break link 11, which breaks and releases the traction line 8 when the traction force in the line reaches a certain value. The towline 8 can be made elastic so that the catch net 5 can follow the aircraft in a tensioned position for a longer distance before the fracture link 11 breaks.

Mellan kantelementen S och 6, vilka utgöres av kle- na linor, är anordnat ett nät 12 av smala trådar med god hållfasthet, vilka bildar ett rutmönster mellan de övre och undre kantelementen 5 och 6. Trådarna i nätet kan företrädesvis utgöras av sega trådar 13, 14, exempelvis av nylon eller annan lämplig plast, plastöverdragna tun- na metalltrådar eller liknande.Between the edge elements S and 6, which are constituted by small ropes, a net 12 of narrow threads with good strength is arranged, which form a grid pattern between the upper and lower edge elements 5 and 6. The threads in the net can preferably consist of tough threads 13. , 14, for example of nylon or other suitable plastic, plastic-coated thin metal wires or the like.

I fig. 2 visas en del av rutmönstret i fângnätet 12. I detta fall bildar de tunna trådarna 13, 14 ett rutnät med i huvudsak vertikala 14 och horisontella 13 trådar, vilka vid knutpunkterna 15 är förbundna med va- randra. Trådarna 13 och 14 bildar en vinkel V med va- _randra.Fig. 2 shows a part of the grid pattern in the catch net 12. In this case the thin threads 13, 14 form a grid with substantially vertical 14 and horizontal 13 threads, which at the nodes 15 are connected to each other. The wires 13 and 14 form an angle V with each other.

Fig. 3 visar en motsvarande vy som i fig. 2. Tråd- skarorna 16 och 17 är här anordnade diagonalt och skär varandra under spetsig vinkel V vid knutpunkter 18.Fig. 3 shows a corresponding view as in Fig. 2. The wire joints 16 and 17 are here arranged diagonally and intersect at an acute angle V at nodes 18.

Tràdskarorna bildar ett snedställt rutmönster. Trâdarna är förbundna med varandra på samma sätt som angivits ovan. Förutom de i fig. 2 och fíg. 3 visade konfigura- tionerna av trådarna i fângnätet kan givetvis andra kon- figurationer tänkas. Det väsentliga är att utrymmet mel- 'lan kantelementen 5 och 6 utfylles av tunna trådar, vil- ka bildar vinkel med varandra och är förbundna med va- randra vid skärníngspunkterna, exempelvis genom knutar eller svetsar så att slutna nätrutor erhålles. f» 10 15 20 25 30 456 815 3 Anordningen fungerar så, att när ett propellerplan av någon anledning inte kan stanna på flygfältsbanan 1, kör planet in i fångnätet 3 och dess av tunna trådar utformade tvärelement. Propellrarna kommer då att in- gripa med trådarna i nätet, exempelvis så att en pro- pellerspets ingriper i en ruta i nätet, varvid de tunna trådarna kommer att ingripa med propellern och följa med i dennas rotation ett antal varv och lindas upp som en klump på propellern och stanna denna och motorn.The thread cores form an oblique grid pattern. The wires are connected to each other in the same manner as indicated above. In addition to those in Fig. 2 and fig. 3, the configurations of the wires in the catching net are of course conceivable. The essential thing is that the space between the edge elements 5 and 6 is filled with thin wires, which form an angle with each other and are connected to each other at the intersection points, for example by knots or welds so that closed net windows are obtained. f »10 15 20 25 30 456 815 3 The device functions in such a way that when a propeller plane for some reason cannot stop on the airfield runway 1, the plane runs into the catch net 3 and its transverse elements formed of thin wires. The propellers will then engage with the wires in the net, for example so that a propeller tip engages in a box in the net, whereby the thin wires will engage with the propeller and follow its rotation a number of turns and be wound up like a lump. on the propeller and stop it and the engine.

Medan detta sker kommer fångnätet dels att dras ihop och dels att flyttas framåt längs flygfältsbanan.While this is happening, the prisoner net will partly be contracted and partly moved forward along the airfield runway.

Draglinorna 9 ryckes loss från markens förankringspunk- ter 10, vilka kan bestå av en ur marken lätt upplyftbar fästanordning, exempelvis en i marken nedslagen pinne eller sprint. Härefter överföres kraften via draglinorna 8 till brottlänken ll vid stolpen2,7.Draglinorna 8 sträc- kes allt mer tills dess att brottlänken ll brister då hela nätet följer med flygplanet i dess fortsatta rörelse. Ändamålet med uppfångningsnätet är att stanna flyg- planets propellrar och motorer innan flygplanet når fång- barriären 4. När flygplanet när denna barriär uppfångas det på samma sätt som ett propellerlöst flygplan, varvid inga skador àsamkas barriären eller flygplanet, som upp- fångas mjukt och utan skador.The tow lines 9 are pulled loose from the ground anchoring points 10, which may consist of a fastening device easily liftable from the ground, for example a stick or pin driven into the ground. Thereafter, the force is transmitted via the tow lines 8 to the rupture link II at the post 2,7. The tow lines 8 are stretched more and more until the rupture link II breaks when the entire net follows the aircraft in its continued movement. The purpose of the interception net is to stop the aircraft propellers and engines before the aircraft reaches the capture barrier 4. When the aircraft reaches this barrier, it is intercepted in the same way as a propellerless aircraft, whereby no damage is caused to the barrier or the aircraft, which is intercepted softly and without injuries.

Fângnätet 3 kan utföras av billigt material för en- gångsanvändning så att det endast behöver skäras loss från flygplanets propellrar efter infàngníngen.The capture net 3 can be made of cheap material for single use so that it only needs to be cut loose from the aircraft propellers after capture.

En fackman kan modifiera uppfinningen på olika sätt genom utformning av de olika i anordningen ingående ele- menten inom ramen för efterföljande patentkrav.One skilled in the art can modify the invention in various ways by designing the various elements included in the device within the scope of the appended claims.

Claims

456 815 10 15 20 25 30 35 4 Patent collar

1. A unit for stopping the propellers of an airplane, the unit being arranged at a distance in front of a catchment barrier, arranged across an airfield runway (1) for catching propeller-driven aircraft, the unit comprising upper edge elements (5), which by means of tow lines (8) are connected to the top of posts (2, 7) next to the airfield runway (1), and a lower edge element (6), which by means of lower tow lines (9) is attached to the ground next to the airfield runway (1) and between the edge elements (5, 6) arranged and connected to them transverse elements, characterized in that the traction ropes (8) of the upper edge element (5) comprise breaking links (11), arranged to rupture and release the traction rope (8) when an aircraft runs into the unit (3) and the traction force in the traction lines (8) reaches a certain value, that the traction lines (9) of the lower edge element (6) are releasably attached to anchoring points located on the ground next to the aerodrome runway (1) (l0), arranged to be pulled loose when the tensile force in the lower traction lines (9) reaches a certain value, in order thereby to release the traction lines (9) and thus the entire assembly (3) from the ground, that the cross elements are constituted by thin wires (13, 14) of a soft but strong material, for example plastic or plastic-surrounded metal wires, which wires form two mounds (13, 14) of with substantially parallel wires, which wire mounds (13, 14) form an angle (v) ~ with each other so that intersection points (15) occurs, the intersecting wires being connected to each other at the intersection points whereby the unit released from the ground by engagement with the aircraft propellers bring them to a stop before the aircraft reaches the capture barrier (4).

A g g r e g a t 'according to claim 1, characterized in that the two strands (13, 14) intersect at approximately right angles. »Il n n! , h 10 15 456 813 S

3. 9 9 I 8 9 a f according to claim 1 or 2, characterized in that the wire cutters are arranged approximately horizontally (13) and vertically (14).

A h 9 according to claim 1 or 2, characterized in that the wires (13, 14) in the two wire cores extend between and are fixedly connected to both the upper edge element (5) and the lower the edge element (6). 5. A e g r e 9 a t according to claim 1, characterized in that the two strands of wire intersect at an acute angle (V).

5. Aqqreg ﬂﬁ according to requirements, characterized in that the tow lines (8) are elastically extendable.