Historical clue formulations

• Chopper spinner — 2025-07-13
• Turbine turner — 2024-09-11
• Give it a whirl! — 2024-03-08
• Whirler on a whirlybird — 2019-01-29
• Helicopter feature — 2018-06-10
• Chopper topper — 2017-09-24
• Certain blade — 2016-12-18
• Part of an ignition system — 2016-10-09
• Helicopter part — 2016-08-16
• Whirlybird feature — 2016-01-06
• Turbine part — 2015-03-04
• Helicopter blade — 2013-02-25
• Wind turbine part — 2011-07-06
• Apache topper — 2011-04-09
• Helicopter topper — 2011-02-07
• Wankel engine part — 2011-01-21
• Helicopter part — 2010-11-30
• Helicopter part — 2010-09-02
• Helicopter part — 2009-07-13
• Turbine part — 2009-05-27
• Helicopter blade — 2009-04-13
• Wankel engine component — 2009-01-09
• Helicopter part — 2008-10-21
• Chopper part — 2007-09-02
• Kind of blade — 2006-07-16
• Windmill part — 2005-12-29
• Helicopter feature — 2005-09-19
• Turbine part — 2005-06-12
• Chopper blade — 2005-02-07
• Chopper part — 2004-03-23
• Turbine part — 2003-08-26
• Beanie's top, perhaps — 2002-11-13
• Generator part — 2002-07-04
• Kind of blade — 2002-04-02
• Moving machine part — 2001-08-06
• Helicopter part — 2001-04-30
• Spinning part — 2001-04-23
• Chopper blade — 2001-04-12
• Turbine turner — 2001-01-06
• Gyrocompass component — 1999-09-10
• Certain blade — 1999-06-03
• Turbine part — 1998-03-12
• Chopper part — 1998-03-08
• Kind of blade — 1997-12-24
• Revolving machine part — 1997-10-28
• Wankel engine part — 1997-04-22
• Copter part — 1996-12-30
• Helicopter part — 1996-11-20
• Helicopter part — 1996-04-26
• Wankel engine part — 1996-02-24