Why does it? Is it better?
It does it because it's very simple to build, as long as you're happy with total loss lubrication. Other than that, it's a shit design, which is why it was completely replaced by radial engines within a few years.
@gbj_tester started
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It does it because it's very simple to build, as long as you're happy with total loss lubrication. Other than that, it's a shit design, which is why it was completely replaced by radial engines within a few years.