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MRI - Measurement Recording Instrument

The MRI is a high-quality measurement machine in 3D. Measurements carried out in 3D and are therefore very accurate. Kramer Propellers is using this measurement tool for propeller repairs and modifications.

Using the MRI, we are able to optimize and provide a trouble-free propeller. The machine shows graphically what the pitch, rake, track, blade spread, and geometry of each propeller blade is. Above all it is determent what class the propeller is according ISO 484/2.

The classes are S, I, II, and III where S is the highest class.

Due to the highly accurate measurements the propeller can be repaired or modified in any desired class.

Problems that can be detected by the MRI:

• Underperformance; due to wrong actual pitch (may be correct indicated on prop itself however).
• Vibration; induced by variations in pitch and camber of each blade can be detected. (not just vibrations caused by the static or dynamic imbalance). Vibrations are annoying, absorbs power and causes damage to the driveline.
• Cavitation; causes erosion, noise and vibration. Resulting in damage to blade tip, blade surface, propeller hub and the driveline such as the bearings and will ultimately affect the overall efficiency and performance of the propeller.
  

Benefits of a propeller analyzed by the MRI are:

• Speed Gain. Because all blades are exactly the same after repair and inspected with the MRI , the propeller performs better as before, this will increase the top speed.


  
• Fuel consumption is in the favorable sense affected. The difference in consumption between class I and class III may reach 10% what ultimately effects your wallet and the environment through the reduced emissions.


  
• Copy of screw data as may be desirable when multiple propellers. This means that the left and right turning screw after repair have same performance. Can also be programmed to any profile to specific needs.

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