Re: [VFB] Dry Flies 102

[Ian Mitchell]

There are two different principles at play...

Surfacetension is for very small objects - the force required to break surfacetension is quite small.. this is why you can float a needle on the surface of pure water if you are careful...

Archimedes principle for large ones.. A ship has far too much mass for the effects of surfacetension to have any noiceble effect.

Foam flies are unsinkable because their density is less than water.. the will always float regardless ofwhether or not htey break the surcae tension.

Hackled dry flys float because they cantrap air in the hackle ,AND the hackle also sits on the surfcae of the water without breaking the surface tension.. a slimed dry fly will break the surfacetension, as will a fly with detergent... oil and floatant help increase the surface tension ofthe water.. they are hydrophobic.. slinme is Hydrophillic...

Ian



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