Some interesting things about the Republic Rainbow utilizing exhaust thrust.
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Instead of dumping the waste gate exhaust off to the side like on the P-47, the waste gate gas was fed into the turbo exhaust. In this way all of the exhaust gas came out the same exit giving a pretty significant boost at lower altitudes. Here the dotted line is the dumped exhaust and solid the recombined exhaust.
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A variable area exit was used to further boost the exhaust thrust.
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Lastly, a comparison between the Rainbows installation and a 'typical' one. There is a typo in the net BHP on the right column; it should be 2409 not 4209.
Highly interesting! And thanks for clearing up this typo thing ...