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Model 8500 C+ Title Bar
8500 C+ Unit

The Easiest and Most Widely Used
Airplane and Helicopter Rotor System
Propeller Balancing Equipment in the World Today

The 8500C+ is the latest and most capable system in the long line of legendary Chadwick-Helmuth balancers and vibration analyzers. State-of-the-art digital technology together with proven Chadwick aircraft vibration knowledge and experience provides quick and easy identification and control of aircraft vibration problems before they become costly. Don't put your maintenance and flight crews through hours of repeated aircraft starts and flights trying to smooth an aircraft; the 8500C+ will provide you the analysis and balance solutions quickly, safely, and in least number of flights possible.

Chadwick-Helmuth has designed all this into one easy carrying case. With over 300 different applications virtually every helicopter and airplane in the world can be serviced. Our user friendly instructions make every user an expert. The 8500C+ also includes rotor blade tracking by automatic FASTRAK™ optical tracker or hand held STROBEX. The Chadwick-Helmuth 8500C+ is used by more commercial and military users than any other smoothing and balancing system in the world.

8500C+ Analyzer/Balancer Kit THE 8500C+ Balancer/Analyzer

  • Back-lit for night use
  • Built-in printer & disk drive
  • PC/MS DOS compatible data
  • Operating temperature -40°C to 55°C
  • Weight of Balancer 7.6 lbs
  • Weight of Kit
    less than 40 lbs. typical


The Chadwick-Helmuth 8500C+ performs these critical tests for the C-130 Hercules:

  • Propeller balance
  • In-flight engine monitoring
  • Mils broadband
  • Failure and trend prediction
  • Reduction gearbox assembly break-in
  • On-wing engine diagnostics
  • Torquemeter run-out
  • Turbine seal break-in

8500C+ Specs for the C-130

System specifications for the Model 8500C+
Display backlit and heated LCD display 1.4" x 5.3", 64 x 256 pixels

Memory up to 2 MB SRAM, 1 MB flash EPROM

Strobex connector allows use of strobex for visual track observation phase measurement

36 vibration channels

4 phase input channels

Up to 600,000 rpm spectrum

Fastrak optical tracker accuracy ± 1mm +5% of reading

Power requirements 12 to 28 VDC (28 VDC nominal), battery option available for self-contained operation

Dimensions 10.8 x 7.5 x 4.0 in. (27.4 x 19.1 x 10.2 cm) Weight 7.1 lb (3.22 kg)

Vibration Amplitude accuracy ± 0.2 dB (for balance)
Phase accuracy ± 2 degrees

Spectrum max frequency 200 to 600,000 rpm in arbitrary user selected steps

Spectrum resolution 461 lines up to 7.5 kHz, 400 lines up to 10 kHz
Printer integral thermal printer

Data storage/ transfer integral 1.44 meg 3.5" disk drive, PC/MS-DOS compatible
Temperature operating range - 40°C to 55°C (-10C for printer/disk drive) storage - 52°C to 70°C
8500C+ Kit for Allison T-56

Custom kit for Allison T-56 or Hamilton Standard 54H60


On-wing engine vibration diagnostics
Engine test cell vibration monitoring and diagnostics
5 velocity sensors 2 high-temperature accelerometers which monitor and diagnose health of engine and propeller





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