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Aerofoil Spreaders

Some of the later production Vikings were fitted with aerofoil spreaders. They have the extrusion illustrated below, the shaft length being 35". Apart from looking really sharp and "high tech" I don't think they answered any particular shortfall in the original circular section spreaders. [Click on the image to enlarge]                 
spreader-section.jpg (74194 bytes)
spreader-end.jpg (49328 bytes)
         spreader-end-detail.jpg (74954 bytes)