Those boards were made using aluminum honeycomb and were glassed very thin, they used acarbon top sheet for stiffness. They were not the most durable boards in the world. The materials are incredibly expensive as well, combine the durability issues and high costs with the fact that these are waterski companies with a limited production capability probably spelled the end of their mfg boards. Plus there was a backlash from the trick skiers towards Russell Gay for making Exocet wakeboards. They were pissed for him "selling out". The technology is there, just really expensive. My uncle is a ride designer/builder for Disney & he told me of a paper based composite that was 1/2 the weight of aluminum honeycomb and with similar flex qualities, pretty cool stuff. Oh also, those boards were 14 inches wide in the middle and had a lot less material than current wider shapes, that helped the weight.
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