Historical clue formulations

• Road runners? — 2024-02-08
• Inventions of Karl Benz and Rudolf Diesel — 2022-06-11
• What cowlings cover — 2013-12-22
• Ramjets, e.g. — 2012-11-04
• They're under hoods — 2009-04-16
• Some roarers — 2003-10-12
• Fan sites — 2003-08-22
• Ramjets, e.g. — 2003-04-18
• They might backfire — 1999-02-28
• 35-Down's quartet — 1998-09-05
• Gas guzzlers — 1997-12-27
• Turbojet and others — 1994-07-26
• Driving forces — 1994-01-15