Grumman won the contract to build the forward-swept-wing X-29. But Grumman was not the only company to go for the contract; Rockwell devoted a fair amount of effort – both engineering and PR – to win the prize. Their concept was similar, though intended to be a wholly new aircraft, and with a notably different planform. Below is a magazine ad from 1980 showing a model of the Rockwell “Sabrebat” concept.
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