| This unit of measurement became necessary when the sound barrier was broken in 1947 |
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| Speed of object divided by speed of sound |
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| Jet speed measure |
Eugene Sheffer |
20 Feb 2024 |
| _ number |
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| Supersonic unit |
Eugene Sheffer |
23 Jan 2024 |
| Ernst —, Austrian physicist who devised a system of speed measurement |
Mirror Quiz |
27 Dec 2023 |
| Ernst, Austrian physicist who devised a system of speed measurement (4) |
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| Physicist Ernst |
New York Times |
25 Dec 2023 |
| Physicist who established the principles of supersonics and the ratio of the velocity of a body to the speed of sound (4) |
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| David —, Scottish artist whose work includes 1999 installation Big Heids |
Mirror Quiz |
02 Dec 2023 |
| High speed number |
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| Supersonic speed measure |
LA Times Daily |
28 Nov 2023 |
| Speed unit for the late Chuck Yeager |
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| David -, Scottish artist whose work includes 1999 installation Big Heids (4) |
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| ___ I (the speed of sound) |
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| Supersonic speed measure |
Newsday |
26 Sep 2023 |
| Supersonic speed unit |
Premier Sunday |
24 Sep 2023 |
| ___ 1 (speed of sound) |
USA Today |
26 Jul 2023 |
| Name associated with speed |
New York Times |
22 Jun 2023 |
| Ernst who studied sonic booms |
New York Times |
29 Mar 2023 |
| Jet speed measure |
Eugene Sheffer |
04 Mar 2023 |
| The speed of sound |
Canadiana |
26 Dec 2022 |
| Eminent shock-wave studier |
Newsday |
12 Nov 2022 |
| — 1 is the speed of sound |
The Times Concise |
18 Oct 2022 |
| Speed of sound |
Canadiana |
11 Jul 2022 |
| Name associated with supersonic speed |
LA Times Daily |
05 Jul 2022 |
| Namesake of a speed ratio |
LA Times Daily |
23 Jun 2022 |
| Supersonic unit |
LA Times Daily |
15 May 2022 |
| Supersonic unit |
The Washington Post |
15 May 2022 |
| Jet speed measure |
Eugene Sheffer |
17 Mar 2022 |
| __ number (SST stat) |
Newsday |
10 Mar 2022 |
| ___ 1 (speed of sound) |
Universal |
05 Feb 2022 |
| Name often followed by a number |
Newsday |
23 Jan 2022 |
| Jet speed measure |
LA Times Daily |
02 Jan 2022 |
| Speed-of-sound ratio |
Premier Sunday |
19 Dec 2021 |
| Speed of sound |
Canadiana |
15 Nov 2021 |
| Jet speed measure |
Eugene Sheffer |
09 Oct 2021 |
| It's calculated relative to the speed of sound |
New York Times |
27 Aug 2021 |
| Jet speed measure |
Eugene Sheffer |
21 Aug 2021 |
| Eponymous physicist Ernst __ |
LA Times Daily |
11 Aug 2021 |
| Eponymous physicist Ernst __ |
The Washington Post |
11 Aug 2021 |
| Speed ratio |
The Washington Post |
10 Aug 2021 |
| Speed ratio |
LA Times Daily |
10 Aug 2021 |
| Speed-of-sound word |
LA Times Daily |
09 Aug 2021 |
| Speed-of-sound word |
The Washington Post |
09 Aug 2021 |
| Ernst who studied aerodynamics |
Wall Street Journal |
23 Jun 2021 |
| ___ 1 (speed of sound) |
USA Today |
10 Feb 2021 |
| Jet speed measure |
Eugene Sheffer |
25 Nov 2020 |
| '___ Man' (1978 hit) |
The Washington Post Sunday |
22 Nov 2020 |
| Namesake of a speed ratio |
LA Times Daily |
22 May 2020 |
| Namesake of a speed ratio |
The Washington Post |
22 May 2020 |
| Supersonic speed measure |
Universal |
08 May 2020 |
| ___ 1 (speed of sound) |
Universal |
05 Apr 2020 |
| Airspeed ratio |
Thomas Joseph |
13 Nov 2019 |
| Unit of speed of sound |
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| South American landmark whose name means 'old peak' |
New York Times |
16 May 2019 |
| Measure of speed in walk, not run |
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| Eponymous physicist Ernst |
New York Times |
13 Mar 2019 |
| South American landmark whose name means "old peak" |
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| Eponymous physicist Ernst |
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| Physicist associated with sonic booms |
The Chronicle of Higher Education |
21 Dec 2018 |
| __ 1 (speed of sound) |
Newsday |
18 Dec 2018 |
| __ 1 (the speed of sound) |
Newsday |
22 Nov 2018 |
| Jet speed number |
Eugene Sheffer |
03 Sep 2018 |
| Supersonic speed word |
USA Today |
29 Aug 2018 |
| Name often followed by a number |
Newsday |
14 Jul 2018 |
| Speed-of-sound word |
USA Today |
19 Jun 2018 |
| Airspeed measure |
Newsday |
03 May 2018 |
| Supersonic speed word |
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| Speed-of-sound word |
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| Physicist associated with sonic booms |
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| Supersonic unit |
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| Austrian physicist Ernst |
Jonesin |
12 Sep 2017 |
| Word in supersonic speeds |
USA Today |
05 Jun 2017 |
| Ernst for whom a speed measure is named |
USA Today |
28 Apr 2017 |
| Sound-barrier word |
Jonesin |
28 Mar 2017 |
| Jet speed word |
USA Today |
07 Feb 2017 |
| Ernst for whom a speed measure is named |
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| Word in supersonic speeds |
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| — Number relates to speeds |
The Times Concise |
29 Dec 2016 |
| Flying speed word |
Thomas Joseph |
10 Dec 2016 |
| Speed-of-sound name |
USA Today |
26 Aug 2016 |
| Speed unit |
LA Times Daily |
16 Jul 2016 |
| Aerodynamics measure |
Newsday |
17 Jun 2016 |
| Speed-of-sound word |
Universal |
24 Mar 2016 |
| Flying speed unit |
The Washington Post |
05 Mar 2016 |
| Big name in aerodynamics |
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| Speed-of-sound name |
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| Speed unit |
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| Speed-of-sound ratio |
The Washington Post |
25 Dec 2015 |
| Eponymous physicist Ernst __ |
LA Times Daily |
19 Dec 2015 |
| Speed-of-sound ratio |
New York Times |
16 Sep 2015 |
| Speed-of-sound ratio |
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| Number used in measuring the speed of sound |
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| Eponymous physicist Ernst __ |
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| Speed of sound ratio |
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| Aerodynamics studier Ernst |
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| Speed of sound measure |
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| Physicist for whom a speed-of-sound ratio is named |
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| Speed-of-sound ratio |
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| Jet speed unit |
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| Jet speed measure |
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| -- number (speed ratio) |
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| Ratio of fast flight |
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| Austrian physicist |
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| See 13-Down |
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| Jet speed |
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| Speed-of-sound ratio |
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| Jet speed |
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| Speed-of-sound name |
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| Eponymous physicist Ernst __ |
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| Endeavor speed measurement |
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| Speed-of-sound name |
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| Speed-of-sound ratio |
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| Presidents of the United States of America "___ 5" |
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| Physicist Ernst who studied shock waves |
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| Speed-of-sound ratio |
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| Speed of sound word |
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| Supersonic unit |
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| __ one (speed of sound) |
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| Supersonic speed unit |
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| Presidents of the United States of America: "___ 5" |
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| Jet speed unit |
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| Jet speed category |
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| Speed ratio |
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| Speed ratio |
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| Name often followed by a number |
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| Sound number |
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| __ 1: speed of sound |
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| Speed-of-sound word |
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| __ 1: speed of sound |
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| Speed-of-sound word |
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| Sound-speed number |
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| ___ 5 (Speed Racer's car) |
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| Supersonic unit |
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| Aerodynamics number |
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| Airspeed ratio |
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| Yeager's speed |
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| Speed of sound indicator |
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| Physicist Ernst |
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| Airspeed measure |
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| Speed-of-sound ratio |
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| Physicist Ernst |
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| Physicist Ernst |
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| Ratio of fast flight |
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| Speed-of-sound word |
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| Supersonic unit |
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| Speed of sound number |
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| Word often followed by a numeral |
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| Speed-of-sound number |
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| Eponym for a measure of speed |
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| Number associated with a boom |
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| __ 1 (speed of sound) |
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| Aircraft velocity unit |
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| Austrian physicist Ernst who has a speed unit named after him |
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| Sonic unit |
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| Speed of sound number |
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| Physicist Ernst |
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| Pioneer in the study of supersonic velocities |
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| Airspeed ratio |
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| Flight-speed unit |
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| Speed of sound ratio |
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| __ I (Yeager attainment) |
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| Speed studier Ernst |
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| Jet speed indicator |
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| Sound speed |
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| Speed ratio |
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| Sonic unit |
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| Speed-of-sound designator |
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| Physicist with an eponymous number |
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| Flight number |
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| Jet speed |
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| Speed ratio |
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| Speed-of-sound number |
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| Word related to speed |
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| Jet speed unit |
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| One makes booms |
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| Gillette's ___ 3 razors |
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| Supersonic reading |
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| ___ one |
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| Measure for fast fliers |
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| Enterprise speed measurement |
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| Speed-of-sound number |
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| Gillette's ____ 3 razors |
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| Ratio of fast flight |
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| SST number |
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| Speed ratio |
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| Austrian physicist and philosopher |
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| Flight ratio |
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| Jet speed measure |
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| Sonic unit |
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| Speed-of-sound number |
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| Projectile scientist |
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| Sound speed unit |
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| Number of sonic booms |
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| Airplane speed indicator |
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| Word before 1 or 2 |
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| ____ number |
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| Airspeed unit |
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| Extremely high speed |
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| Supersonic number |
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| Kind of number |
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| High-speed number |
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| Physicist Ernst |
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| ___ number (speed ratio) |
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| Jet-speed unit |
|
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| ___ number (speed measure) |
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| Airspeed number |
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| Sound-speed number |
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| Sound-speed ratio number |
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| Austrian physicist: 1838–1916 |
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| Jet speed number |
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| Austrian physicist |
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| Word with wave or number |
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| Measure of speed relative to sound |
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| SST word |
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| Flying speed measure |
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| Jet plane's speed unit |
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| Sound-barrier word |
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| Sound-speed word |
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| Sonic-speed unit |
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| Speed-ratio number |
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| Sonic-speed word |
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| Supersonic speed word |
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| Austrian physicist. |
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| Speed ratio. |
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| Famous Austrian physicist. |
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| Unit of speed of sound. |
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| Supersonic unit. |
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| Speed unit. |
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| Austrian scientist. |
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| ___ number. |
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| Number representing speed-sound ratio. |
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| Measure of sound. |
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| Austrian physicist, his name a number in supersonics. |
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| ___ number indicating subsonic or supersonic speed. |
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| Unit in measuring speed of sound. |
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| Unit of speed/sound ratio. |
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| Unit for speed of sound. |
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| Term referring to the speed of sound. |
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| ___ I (speed of sound) |
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| Speed measurement |
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| Flying rate |
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| Flight number? |
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| Fast measurement |
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| Boom measurement |
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