Supersonic Biplane This biplane concept is based on a design by engineers at Tohoku University. MIT/Christine Daniloff
The Supersonic Jet Of The Future Will Be A Biplane -- Popular Science
When supersonic travel inevitably returns to the skies, the airplanes are going to look a lot different. At least one design harks back to the early days of aviation with a biplane design, rather than a sleek delta-winged jet like the Concorde. This shape can apparently produce much less drag and therefore much less noise at supersonic speeds, MIT engineers say.
The decreased drag would make a supersonic biplane more fuel-efficient and it would produce a quieter sonic boom, because the shock waves propagating toward the ground would be canceled out. The trick is getting it to fly.
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My Comment: Cool.