Products - Hydraulic Dynamometers

Froude Invented the Water Brake Dynamometer


The Froude F Range Hydraulic dynamometers (also referred to as water brakes) have been designed to be compact, robust and to allow easy maintenance. Some of these models are available with a streamlined, fabricated base. This base is not only ultra durable due to the powder coating process, but also offers flexibility with water inlet/outlet placement and lifting eye locations.  

These engine dynos are fitted with two half couplings which, with the rotor, are oil injected onto the shaft. The standard machines run in grease lubricated rolling element bearings.

 The hydraulic dynamometer working compartment consists of special semi-circular shaped vanes cast into stainless steel rotor and stators. Water flowing in a toroidal vortex pattern around these vanes creates a torque reaction through the dynamometer casing which is resisted and measured by a precision load cell. The dynamometer load is controlled by a 'butterfly' water outlet valve, operated by a closed loop electro-hydraulic servo system. The power absorbed by the dynamometer is carried away by the water in the form of heat.

KEY to Model Letter Designations: R= Reversible, D= Dual Compartment, AV= Axial Vane (bi-directional), GT= Gas Turbine, FRR= Fixed Return Ring

KEY to Numeric: F359: 35 = rotor size (cm), 9 = 90° crop on rotor

Model Max Speed (RPM) Torque Nm (lb.ft) Power 
kW (BHP)
Curve Ref
F24 9,000 2,700 (1,990) 750 (1,010) 002396
F246 9,000 2,700 (1,990) 750 (1,010) 003011
F246FRR 11,000 2,000 (1,480) 750 (1,010) 001980
F249 16,000 1,270 (940) 750 (1,010) 001253
RF24AV 10,000 1,780 (1,310) 750 (1,010) 004440
F35 6,000 7,120 (5,250) 1,640 (2,200) 002483
F35GT 6,000 10,780 (7,950) 1,640 (2,200) 004530
F359 9,000 5,220 (3,850) 1,640 (2,200) 001902
RF39AV 6,000 7,120 (5,250) 1,640 (2,200) 002475
F47 4,500 18,500 (13,650) 3,300 (4,425) 001774
F47GT 4,500 28,470 (21,000) 3,300 (4,425) 003981
F476 4,500 18,500 (13,650) 3,300 (4,425) 002847
F479 7,000 13,700 (10,105) 3,300 (4,425) 002476
RF47AV 4,500 17,850 (13,150) 3,300 (4,425) 004046
F63 3,600 50,000 (36,900) 6,700 (9,000) 001775
F639 5,000 37,000 (27,300) 6,700 (9,000) 002477
RF63AV 3,600 47,120 (34,800) 6,700 (9,000) 003917
F84 2,500 142,000 (104,750) 12,000 (16,100) 001776
F849 4,000 76,000 (56,100) 12,000 (16,100) 003531
RF84AV 2,500 101,400 (74,800) 12,000 (16,100) 004043
RF84 2,000 142,000 (104,750) 12,000 (16,100) 001922
F84D 2,000 187,500 (138,500) 24,000 (32,200) 001894
F849D 4,000 101,700 (75,000) 29,840 (40,000) 004321 

Description

As standard, the F type machines are fitted with two half couplings allowing connection at either end. These, along with the rotor, are oil injected on to the main shaft, thus eliminating stress raising keyways. Grease lubrication is replaced by the optional 'oil mist' system for the High Speed versions.

The dynamometer working compartment consists of special semi-circular shaped vanes cast into stainless steel rotors and stators. Water flowing in a toroidal vortex pattern around these vanes creates a torque reaction through the dynamometer casing which is resisted and measured by a precision load cell. The dynamometer load is controlled by a characterised water outlet valve, operated by a closed loop electro hydraulic servo system.

The power absorbed by the dynamometer is carried away by the water in the form of heat.

Applications

Development, production and post overhaul testing of:

  • Automotive gasoline and diesel engine
  • Industrial and marine diesel engines
  • High performance competition engines
  • Turboprop, turboshaft and power generation turbines
  • Engine components
  • Electric motors

Specification

The standard range of Froude F type Hydraulic dynamometers extends from 750 kW up to 25,000 kW and speeds up to 10,000 rpm. Torque measurement accuracy is ±0.25% of full rated torque of the dynamometer.

Speed is measured by a pulse pickup operating with a 60 tooth wheel and gives accuracy of ±1 rpm.

Froude dynamometers are painted traffic blue RAL 5017. 

Visit our Global Sales Page to inquire about Froude Equipment, or fill out the contact form below. 

Download Fact Sheet:

FROUDE F-SERIES DYNAMOMETERS

Options

  • High speed versions up to 16,000 rpm
  • Calibration equipment
  • Shaft bearing thermocouples
  • Water inlet pressure switch
  • Water inlet valve, pneumatic or servo operation
  • Water outlet valve fail-safe device
  • Water inlet and outlet thermocouples
  • Bi-directional machines
  • Paint color

Customer Service

  • Facilities planning and installation services
  • Comprehensive in-house and/or on-site training courses
  • Tailored preventative maintenance contracts
  • Technical Support 

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