1 Prior art
2 Draw backs of prior art
3 Comparison between prior art and present invention
4 Aim of the invention
5 Summary of the present invention
6 Brief description of drawings
7 Statement of invention
8 Detailed description of invention .
1) Field of invention
It is a mechanical engineering design which comes into operation during the Ground testing of helicopters.
2) Use of invention
This invention finds application in the wireless data communication.
3) Prior art
In the previous design, the helicopter parameters were recorded using the conventional method. This method involves the use of brackets to install the unit and route the cables at various test points under

consideration. The unit has cables on both ends. The routing of cables is done with the help of tube from upper control system to the receiver unit. This method used is contact type method.
4) Draw backs of prior art
There are few shortcomings in the earlier design which is mentioned below:
• The contact needs to be maintained from one end to another end for its proper functioning.
• The tube carrying the cables passes through gear box and fuel tank.
• Routing of the cables along with tube is a tedious job.
• Leakage may occur due to the failure of O-ring because of frequent attachment and detachment of fuel tank.
5) Comparison between priorart and present invention
The time required to install the current configuration is less as compared to earlier design Possibility of wrong connections and damages of cables is eliminated in the wireless configuration. Securing of cables needs lot of times to ensure routed safely with other cables and surface needs to clean every time ■n order to ensure proper connectivity to support cables. Maintenance^ cables and connectors needs to follow-up frequently so that data error may no, happen during testing compare to wireless configuration Accessibility, operation, and inspection during testing time is tedious job for conventional method compare to current configuration due to ease of non-contact system along with supporting attachment units and antenna (for transmitting data) on rotor hub plate.
6) Aim of the invention
The prime objective of the invention is to ensure the safety and accurate data transfer from the helicopter during testing. The present invention also aims to improve the productivity by reducing the enormous human effort which was spent during follow-up, rework / inspection of earlier design

7) Summary of the present invention
In the present design, the new installation scheme is designed and developed for testing, on Ground Test Vehicle. It contains combination of units and attachments (Brackets) as an assembly, installed on Rotary Hub Plate of helicopter. The unit consists of battery, the main system (DAQ unit), transmitter and antenna. The Rechargeable battery supplies power to the unit. The transmitter and antenna are used to transmit the data. Unlike the earlier method, it is non contact method.
8) Brief description of drawings
The Figurel explains the basics of conventional design and the attachment details of the contact type slip ring. The cable routing pipe runs through the gear system which makes it critical installation. The tube exit is through the oil tank which can result into leakage, if proper sealing is not done. Since the routing of cable is done through sensitive area, which is tedious and time consuming process.

9) Statement of invention
The present invention of non contact system is being operated wirelessly; hence the procedure of routing the cables is eliminated. The gear box and oil tank area remains unaffected, since the pipe is not required. Hence the reliability and safety of the system is enhanced when compared to the previous design.
10) Detailed description of invention
The non contact system is installed on the hub plate. The system consists of DAQ unit, battery, transmitter and antenna. The DAQ unit is used to record and also convert the data, from strain gauges installed at different locations, to measure the parameters. The rechargeable battery is used to supply power to the transmitter. The data is transmitted through transmitter with the help of antenna to the receiver unit.
The Base Plate is mounted on the hub plate with the help of 12 bolts as shown in Figure-2. The DAQ unit is installed on the base plate with the help of L-angles at 2 places. Each of the L-angles are fixed on the base plate with help of 3 bolts. The other end of the L-angle is attached to DAQ unit with the help of 2 bolts.
Racn Main
• The DAQ unit is attached to transmitter and battery using brackets as shown in Figure-3. The battery is resting on the base plate and held firmly with the help of Z Bracket and Plate. The transmitter is attached to DAQ unit using Plate and C Bracket-1. Bolts are used to attach transmitter with brackets.

The Antenna is attached to DAQ assembly with the help of 2 brackets as shown in Figure-4. The bolts are used to attach the C-bracket-2 and C-bracket-3 to antenna and DAQ assembly. The installation of DAQ unit, transmitter, battery and antenna are done such that the complete assembly acts as a single unit.

" Since the system is fixed on the top of hub plates and exposed to air, the drag will be developed which will affect the performance of the helicopter. To overcome this, Doom is placed on the entire assembly to cover all the units. The Doom is attached to Base plate with the help of 12 . bolts attached along the circumference as shown in Figure-5. A small cutout is provided on doom to route the strain gauge wires.