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• Replaced rusted rail system with new stainless steel “railroad tie”system that allows for storage away from the harsh elements in the bunker.

• Created a new mount for the load cell that is independent of the rail system.

• Replaced calibration wire with a lower gage that is more flexible and has a protective coating.

• Replaced original damaged linear bearings on rocket pillowblocks with new linear bearings.

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Thermocouple wires are being fed through the pre-combustion chamber pressure transducer access in the injector plate and along the inside wall of the steel chamber to locations specified by the Flying Rocket Team.

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• Vertical Thrust Reading• Lateral Force• Plume Removal• Option for Roll Movement• Acceleration Readings on Rocket Body• Rocket must be restrained safely• Pressure & Temperature Readings• Simple Set Up• Need Amplifiers for Sensors• “Plug & Go” Data Acquisition System/Terminal

Blocks

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3.75Maximum Frame Load Moment (500lbf off axis load)

380Support Bolt Shear Failure of Bolt Threads when Threads Share Load

19Support Bolt Shear Failure of the Bolt Threads when one Thread takes entire load

95Support Bolt Tension Compression

Torque Unknown 75,000inlbf allowableTorsional Bolt Failure

Torque Unknown 22,000inlbfallowableTorsional U-Joint Failure

238Failure of U-Joint Bearing Tension (FEA)

117Failure of U-Joint Bearing Compression (FEA)

100Failure of U-Joint Bearing (Hand Calculations)

600Failure of Bearing on Bolt (Hand Calculations)

147Failure of U-Joint Bolt in Shear

125Failure of Yoke in Tension or Compression

Factor of SafetyLoad Case

Design Factor of Safety Table

Note: Design sizing is based on ease of assembly and proportional sizing to rocket

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• Nose cone size, shape and stress allowablesneed to complete nose cone coupling

• Roll torque estimation• Exact size and shape of the rocket• Method to fix accelerometers to the rocket,

where to place them on the rocket• Expected accelerometer vibration• Accurate count on total number of sensors

required

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Bunker SizeBunker Size – If it is possible to fit our test stand design into the existing bunkhouse.

Plume RemovalPlume Removal – Whether to excavate the ground beneath the test stand or to create a scaffolding system to enable mounting of the rocket.

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Sensor Inputs

Thermocouple Inputs

Sensor Inputs

Thermocouple Inputs

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Load Cell Amplifier

A/D Converter

A/D Converter

A/D Converter

Battery Packs

Thermocouple DAQ Box

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RS232 Ports for A/D Converters

Power Switches

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IN1

OUT2

GN

D3

U7LM340-15

R510k

changed to 22k for actual circuit

0

Output to A/D converter

+3

-2

V+

7V

-4

OUT6

OS11

OS25

U3

LM741

+3

-2

V+

7V

-4

OUT6

OS11

OS25

U4

LM741

V69VdcV7

9Vdc

V89Vdc

V99Vdc

R7

56kR610k

Input from Load Cell

R810k

VIN VOUT

GND

U8

LM320T_15

R9

39k

Linear RegulatorsV

V

+3

-2

V+

7V

-4

OUT6

U1

TLV2783

+3

-2

V+

7V

-4

OUT6

U2

TLV2783

AA_Battery _11.5Vdc

R4

39k

Load_cell_output30mVdc

0

AA_Battery _21.5Vdc

0

R2

12kR310k

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Time

0s 0.1us 0.2us 0.3us 0.4us 0.5us 0.6us 0.7us 0.8us 0.9us 1.0usV(Load_cell_output:+) V(U4:OUT)

0V

2V

4V

6V

8V

10V

000,9.725)

00,30.000m)

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~13 to 14V9.725V10.46V34939k�

-9.130V9.818V32736k�

6.5V6.351V6.83V22822k�

Vout4Vout4Vout4GainRf4

ExperimentalSimulatedTheoretical

Load Cell Op Amp Calculations