Description:1. Title of invention
Title of invention: Twin missile carriage pylon for combat aircraft.

2. Field of invention
The present invention is related to mechanical engineering in general and more particularly to the aircraft armament system and design of underwing pylons of an aircraft to carry the missiles and other stores.

3. Background of invention
The aircraft armament system design deals with the integration of aircraft stores on the aircraft, especially for combat aircraft. The stores will be integrated according to the mission requirements. In a fighter or combat aircraft, many weapon stations are designed to meet the mission requirements, the outboard station of fighter aircraft is typically dedicated to closed combat missiles (CCM). There is a requirement to integrate two closed combat missiles (CCMs) at single outboard station of a fighter aircraft to increase the weapon carrying capability of the aircraft. The available prior arts on the aircraft stores integration do not feature the integration of two missiles (twin missiles) at a single outboard underwing pylon station of the aircraft and associated pylon design to carry twin missiles.

4. Brief Summary of invention
The twin missile carriage pylon (10) is an interface between missile (300) and aircraft wing (100). The twin missile carriage pylon (10) is a rack of streamlined shape which carries two missiles (300) and offers less aerodynamic drag during flight operations of the aircraft. The present invention comprises of two major components, a pylon housing assembly (20) and an adaptor housing assembly (30), both are machined structures made of lightweight aluminium alloy. Along with those are forward fairing (40) and aft fairing (50) assemblies to minimize the aerodynamic drag. The adaptor housing assembly (30) is equipped with launcher forward attachment (32) and launcher aft attachment (33) brackets which are designed to hold the two missile launchers (200) with their attachment bolts.
Present invention is aimed to increase the weapon carrying capability of the aircraft and also easy installation of two missiles on a same pylon station with minimum man power and ground supporting tools. Standard aircraft quality materials and process is used in the construction, finishing and assembly of the pylon (10).

5. Brief description of drawings
Fig-1 shows twin missile carriage pylon assembly (10) in assembled condition with aircraft wing (100), launcher (200), and missiles (300).
Fig-2 shows front view of twin missile carriage pylon assembly (10) along with pylon housing assembly (20), adaptor housing assembly (30), forward fairing assembly (40), and aft fairing assembly (50). The Fig-2 also shows the interfaces of twin missile carriage pylon (10).
Fig-3 shows pylon housing assembly (20) along with pylon housing (21), adaptor attachment bracket-forward (22), adaptor attachment bracket-aft (23), a plurality of covers (24), and a plurality of wing attachment bolts (25).
Fig-4 shows adaptor housing assembly (30) along with adaptor housing (31), launcher forward attachment bracket (32), launcher aft attachment bracket (33), a plurality of covers (34), and a plurality of attachment bolts (35).
Fig-5 shows the forward fairing assembly (40) along with forward fairing (41) and stiffeners (42).
Fig-6 shows the aft fairing assembly (50) along with aft fairing (51) and stiffeners (52).

6. Detailed description of invention
Refer to Fig-1, Fig-2, Fig-3, Fig-4, Fig-5, and Fig-6. The twin missile carriage pylon assembly (10) is providing an interface between two missiles (300) launchers (200) and aircraft wing (100), as shown in Fg-1. The twin missile carriage pylon assembly (10) is classified in to four sub-assemblies (refer Fig-2), which are pylon housing assembly (20), adaptor housing assembly (30), forward fairing assembly (40), and aft fairing assembly (50). The twin missile carriage pylon (10) is assembled with wing (100) using wing attachment bolts (25).
Refer to Fig-3. The pylon housing assembly (20) consists of pylon housing (21) which is made of lightweight aluminium alloy. The forward shape of the pylon housing (21) is to provide lower aerodynamic drag during flight operations of the aircraft and to have sufficient clearance with wing (100) and its control surfaces. The pylon housing (21) is fitted with adaptor attachment brackets -forward and aft (22) (23), made of steel, to assemble the adaptor housing assembly (30) with the pylon housing assembly (20). To protect the pylon housing (21) from environment and to enhance the rigidity, the pylon housing (21) is closed with a plurality of covers (24).
Refer to Fig-4. The adaptor Housing assembly (30) consists of adaptor housing (31) which is made up of lightweight aluminium alloy. The housing (31) is equipped with launcher forward attachment (32) and launcher aft attachment (33) brackets made of steel, to hold two missile launchers (200) with its bolts. To protect the adaptor housing (31) from environment and to enhance the rigidity, the housing (31) is closed with a plurality of covers (34). The adaptor housing (30) is assembled with the pylon housing (20) using the attachment bolts (35).
Refer to Fig-5. The forward fairing assembly (40) consists of forward fairing (41) which is made up of aluminium alloy sheet. The shape of the fairing is to provide lower aerodynamic drag during flight operations of the aircraft. The forward fairing (41) is assembled with a plurality of stiffeners (42) to provide sufficient rigidity. The forward fairing assembly (40) is assembled with the adaptor housing assembly (30) with CSK (countersunk) screws.
Refer to Fig-6. The aft fairing assembly (50) consists of aft fairing (51) which is made of aluminium alloy sheet. The shape of the fairing is to provide lower aerodynamic drag during flight operations of the aircraft. The aft fairing (51) is assembled with a plurality of stiffeners (52) to provide sufficient rigidity. The aft fairing assembly (50) is assembled with the adaptor housing assembly (30) with CSK (countersunk) screws.

7. Drawing numerals:
Item No. Description
10 Twin missile carriage pylon assembly
20 Pylon housing assembly
21 Pylon housing
22 Adaptor attachment bracket -forward
23 Adaptor attachment bracket -aft
24 Covers for pylon housing
25 Wing attachment bolts
26 Bush
27 Pylon housing to wing interface
30 Adaptor housing assembly
31 Adaptor housing
32 Launcher forward attachment bracket
33 Launcher aft attachment bracket
34 Covers for adaptor housing
35 Attachment bolts
36 Flange bush
37 Pylon housing to adaptor housing interface
38 Adaptor housing to launcher interface
40 Forward fairing assembly
41 Forward fairing
42 Stiffeners for forward fairing
43 Forward fairing to adaptor housing interface
50 Aft fairing assembly
51 Aft fairing
52 Stiffeners for aft fairing
53 Aft fairing to adaptor housing interface
100 Wing
200 Launcher
300 Missile
, C , Claims:We claim:
1. A twin missile carriage pylon (10) for combat aircraft, comprising;
- a pylon assembly (10) that is designed to interface between two missiles (300) launchers (200) and aircraft wing (100), characterized in that, the pylon assembly (10) is provided with a streamlined shape that comprises:
- a pylon housing assembly (20) that further comprises of a pylon housing (21) that is made of lightweight aluminium alloy such that the forward shape of the pylon housing (21) is to provide a lower aerodynamic drag during flight operations of the aircraft and to have sufficient clearance with wing (100) and its control surfaces, a plurality of attachment brackets -forward and aft (22) (23) made of steel, and a plurality of covers (24) to close the pylon housing (21) to protect the housing (21) from environment and to enhance the rigidity;
- an adaptor housing assembly (30) that further comprises of an adaptor housing (31) that is made of lightweight aluminium alloy and equipped with a launcher forward attachment (32) and a launcher aft attachment (33) brackets made of steel to hold the two missile launchers (200) with their attachment bolts, a plurality of covers (34) to close the adaptor housing (31) to protect the housing (31) from the environment and to enhance the rigidity, and a plurality of attachment bolts (35) to assemble the adaptor housing assembly (30) with the pylon housing assembly (20) using the attachment brackets -forward and aft (22) (23) fitted in the pylon housing (21);
- a forward fairing assembly (40) that further comprises of a forward fairing (41) that is made of aluminium alloy sheet with a shape to provide lower aerodynamic drag during flight operations of the aircraft, the forward fairing (41) is assembled with a plurality of stiffeners (42) to provide sufficient rigidity, the forward fairing assembly (40) is assembled with the adaptor housing assembly (30) with CSK (countersunk) screws; and
- an aft fairing assembly (50) that further comprises of aft fairing (51) that is made of aluminium alloy sheet with a shape to provide lower aerodynamic drag during flight operations of the aircraft, the aft fairing (51) is assembled with a plurality of stiffeners (52) to provide sufficient rigidity, the aft fairing assembly (50) is assembled with the adaptor housing assembly (30) with CSK (countersunk) screws.