Improve the longevity

Erosion on leading edges is an increasing problem within the wind industry due to harsh weather conditions or increased rotor speeds, and airplanes experience similar erosion on their wing tips due to rain at high speed.

Currently, 16 Rain Erosion Testers have been sold worldwide to coating companies and test centers, including Hempel, Polytech, ORE Catapult, LM Wind Power, and Technical University of Denmark - DTU.

The Rain Erosion Tester from R&D Test Systems offers the most precise and standardized way of testing new products and verifying batches of leading-edge protection systems. The test system is based on a 3-bladed helicopter principle with test specimens shaped like the leading edges tip of a standard wind turbine blade or aeroplane wing. This test setup ensures conditions very similar to real-life harsh weather in an accelerated way.


  • Comprehensive turnkey test system delivered, including test chamber or for building integration
  • Proven level of repeatability and reliability
  • User-friendly operator interface
  • High uptime since test can be conducted automatically after initial running-in
  • Automatic erosion documentation and test report
  • Test specimen design that allows testing of various surfaces on materials like fiberglass and aluminum
  • Full-automatic operation
  • CE marking


The Rain Erosion Tester complies with ASTM G73-10 Standard Test Method for Liquid Impingement Erosion Using Rotating Apparatus, and has a proven level of repeatability and fulfils DNV’s Recommended Practice (DNV-RP-0171) for the testing of rotor blade erosion protection systems.

Furthermore, for aerospace testing, the test system complies with SAE AMS-C-83231A Aerospace Material Specification for Coatings, Polyurethane, Rain Erosion Resistant for Exterior Aircraft and Missile Plastic Parts.

Adjustable test parameters

2.0-3.5 mm
Droplet size (diameter)
200-400 mm
Drop height
29-174 mm/h
Rain intensity
4-30 °C
Water temperature
63-224 m/s
Test specimen tip speed
Between test pictures

Performance and features

  • Droplet size 2.0 – 3.5 mm
  • 4-30 °C water temperature
  • Droplet falling height 200-400 mm
  • Test repeatability COV < 20%
  • Rain density 60 - 360 L/h (29 - 174 mm/h )
  • Automatic test and reporting
  • Tip speed up to 224 m/s
  • Temperature regulated test chamber
  • 390 mm specimen exposure length
  • Quick shift specimen holder

Rain Erosion Tester

Our services

Turnkey solution

R&D Test Systems offers a turnkey solution that includes the rain system, a rotor with test specimen holders, drainage, ventilation, and control system delivered in a housing of 20-foot containers.

System safety is an important parameter because it ensures safe operation during tests at extreme rotational velocities. System safety is guaranteed both by R&D Test Systems and by external machine safety specialists.

Rain erosion testing

We offer rain erosion testing for the development of features and technologies at our own rain erosion tester in Hinnerup, Denmark. The machine is equipped with a dual droplet system and can run tests at both wind and aerospace speeds.

If you are interested in rain erosion testing, you are welcome to stop by and see the machine.

Contact Key Account Manager Niels Pedersen for more information at or +45 63 25 20 51.

How can we help you?

For further information about the Rain Erosion Tester, please contact us

Contact persons
Niels Pedersen
Key Account Manager
R&D Contact Eric
Eric Yu
Head of Sales - Asia
Send us a message