September 16, 1920 AVIATION 131 AVIATION 130 … (21 Incren.se in li<ad res'stanee; Plot 4 shows that tbe highest curve of Plot 3—that for E-^ Fig. 19 (.3) lu some I'anea slight inercase in the heat transfer, foi four tnbes deep, 6-16 in. pitch—becomes low when heat traas- roii-tiliTed, giving approximately the same direct cooling sur- angles up…
Aviation Week
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