"Flow testing done in Australia that shows long curves flow worse than short curves"?..
Agreed, that statement is bound to be highly controversial. Chris, could you kindly provide some science and further documentation behind that assertion? Not only does it go against what "seems logical"; you're also implying that nearly two centuries of scientific research into fluid mechanics and our resulting textbooks on fluid mechanics and fluid dynamics that we learned from at university were wrong... Surely there has got to be another explanation to whatever might have been empirically observed. The flow coefficient of two 45 degree fittings back-to-back and added together always is better than a single 90 of equivalent radius and the longer the curve radius getting from vector A to right angle vector B, the better the flow coefficient, remains my thinking until proven otherwise. Simple conservation of momentum and energy, even within a fluid media of mixed densities .