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The DD engines were goners based simply on emissions non-compliance. Their advantages, otherwise, were stellar (unless you were the, uh, close-proximity operator). But they were also a real mechanics engine as their complexity was no small thing in tear down and re-assembly. Weight, size and power output could be configured almost endlessly.
Beautiful creatures internally, not unlike a big radial engine.
And, Frank Lee, there is worse than bunker fuel. Try "petroleum coke". Refinery residuals is almost euphemistic it sounds so nice given the toxic table scraps dilemma.
We'll drill till we die, baby!
Great .pdf linked. Beautifully done, well written and a helluva sales tool.
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