Because science and engineering is never that simple.

Here some more ramblings :

Take a piece of carbon laminate tubing, length 3 mtr.

Say the proces of carbon cloth laminating is accurate in reproducing the wallthickness to say 2% and lets assume for simplicity that this variantion is constant along the full length of the tube and that there are no other factors (in reality there are).

That gives a 2% variation of the tip deflection when the bending radii aren't too large. Say this variation leads to variations in tip flexing in a batch of tube off say 2 mm.

Now take 4.5 mtr tubes (1.5 times the length of the first tube) cut from the same batch of laminated (mother) tubes.

How much will the variation in tip deflection be on a batch of these longer tubes ?

Think about this a little while.


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Everybody raise their hand who think it will be 2 * 1.5 = 3 mm ? (Yes, Macca, that means you too)

The real answer is 6,75 mm or nearly 3.5 times as much, despite the tube being ONLY 1.5 times longer and from the same "accurate" batch !

So the same production proces, with identical accuracy, can still lead to surprisingly large variations in the end product depending on simple amplifiers like geometric shapes (length in this example).

That, my dear friends, is called non-linearity.

Perceptive minds reading this will immediately recognize that production related variance can not be solved by any changes in crossection shape, layup or anything like that. It is a property of the production proces and subject to the state of technology at this time. Carbon laminate technology is no different then any other technology in this respect.

Now start adding the natural variations in other components like spreaders and diamond wires and the situation gets increasingly worse.

Each component added to a mast will add another cause for variations and deteriorates the dependability of the end result. Length quickly aggerates the overall effect (=amplifier), Tornado masts are part of the longest and most complex in the business, Finn masts are among the shortest and simplest. (Spreaders/no spreaders etc)

And there your Finn class comparison falls flat, again.

You may be a very good sailor, but you may want to stick to what you known best; driving a boat fast. Because in all honesty you are not very knowlegdeable about any engineering stuff and that includes the 3D sail stuff.

Wouter