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Rudder blade weights?


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Have recently bought what I believe is a mk2 4.3 (sail number 2900) and am in the process of making it sailable again. 

Have the rudder blades off as they are needing a lot of love, does anyone know what they would normally weigh? These seem to be overly heavy, weights I have are 2.4 and 2.3kg. I’m believing they may be waterlogged. 
only identifying mark is the Hydrafoil sticker . 

Thanks in advance. 

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If anyone has a dry weight for a grp blade it would be helpful to measure how much effort to put in, have done a core sample and it’s Q cell or talc bog used as a core material. Explains the swelling and seemingly excessive weight, but having only played with carbon foils for the last 25 years am checking to see if it actually may be what’s to be expected. 

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