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OK Dinghy mast bends

Matching bend test numbers

C-Tech will endeavour to meet bend test numbers provided by purchasers to within +/- 5 % for luff-round measurements, +/- 10 % for tip deflection.

Instructions for bend testing an existing mast are given below:

Calculating bend test results for an existing mast


Support the mast at a height that will prevent the tip of the mast hitting the ground when the 10kg weight is hung from it. Fix in place at the butt allowing the mast to rest on the collar (as it is held by the mast step and deck of the boat).

Mark point A (tip of the mast before weight is applied).
See also our OK masts page and our OK news/results.
Place a 10kg weight on the tip of the mast at the measurement band.

Mark point B for sideways and fore & aft deflection.

Take a taut string from the top of the bottom measurement band (D) to the bottom of the top measurement band (C).

Measure the distance in millimeters between the string and the mast at 1/4, 1/2 and 3/4 of the distance CD.  Measurements must be taken both sideways and fore & aft.

Bend test results should be recorded as follows: 

Tip deflection


Fore & aft


Camber (CD)




Fore & aft








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