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Regarding kites, although I don't study aerodynamics, I'm fairly confident that the theory behind them hasn't changed at all during the last 10 years. The only advances have been in the materials they use to build them. The difference between say an 04 and a 06 kite would be almost nothing in terms of design and materials,
Rubbish. The materials have not changed particularly much once rip stop nylon became the norm. The changes are significant revisions aerodynamics, shape, and airflow characteristics and safety equipment to make kites do what riders want them to do. This sport is VERY young. There has been comparatively very little R&D into the designs of the kites being used. This is why "bow" kites have had such an impact.
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Boards would be somewhat the same. The principles behind them havn't changed, only the materials. Newer boards would be carbon/fiberglass composites rather than a wood relic. Apart from weighing less and being stronger, the newer boards would be the same as older ones.
Again utter crap. Some new boards are actually moving away from carbon due to cost and some wood boards are now pushing into new territory. Again, this sport is so young. The shape of rails have changed massively over the last two years. Everyone wanted sharp square rails, now nicely tapered and rolled rails are the norm. The demands on a kiteboard are unique to kiteboarding, so much has still to be learnt, designs will continue to reshape the sport from season to season.
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Unless your forced to do calculus and embedded programming every day ...
Yes to both. When you get past the pricks online that hide behind a web browser and get down to your local beach you might just find that some of the guys in this sport (apart from being wind crazy) are from some amazing walks of life and are quite an intelligent bunch.
If you grab a lesson or two you will very likely progress in a much safer manner and at a far faster rate, it will probably save you money in the long run. (Let me know how long it takes u to rip your first kite in two... everyone does it.)
Having said that, grab a decent second hand (small!) kite, play it safe and take your time and you'll have a blast.
If you get hooked, your first kite will last you about 3 weeks, your first board about 2 weeks more than that. Ask anyone who has been in the sport a while and they will likely tell you about the dozens of kites and boards they have either owned or begged for and borrowed. Then ask them what they are buying next ;)