Ian, The 9G I was refering to was the 'crash / heavy landing load' quoted in section S (CAA rules for microlights) that would ultimatly render the aircraft written off, but in an emergency would allow to to carry on flying to land again if you bounched back up and then couldn't land and had to go round, the wheels might fall off on the second landing! So this is shock loading also and not flight loading which is the +4G / - 2G you refer to, these are max flight loads which you can go up and still keep flying. Before karting I was into microlighting and did a 'major mod' the fiorst of it's kind in the UK - a BMW R100 flat twin which replaced the 462 rotax twin two stroke water cooled. I had to do all sorts of load tests which included the 9G one. For my sins I was the first person to be awarded the Microlight engineering trophy for the best major mod by a non industry 'amature'! Aircraft engineering in many cases transfer well to motorsport and if we all treated our kart outfits like we maintain our aircraft they would be more reliable, possibly faster and finish races. But as with everything aircraft and karts are different and not everything transfers well or is worth transfering. That's probably why I'm the one who's still up at 10pm on the sat night fiddling with the akrt for race day; maybe 90% of what I do is a waste of time, but maybe the 10% helps my boy win??
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