Why was the LRV's speed gauge displaying metric units?Why did NASA use U.S customary units?Is true that Armstrong was not designated as first to walk on the moon?How was dust-mitigation addressed during the Apollo program?What was Apollo 11's reentry speed at parachute deployment?Why did Armstrong pilot the LM, when Aldrin was tasked as Lunar Module Pilot?How intrusive was the Apollo Master Alarm system?Why was Buzz Aldrin not Awarded the Congressional Space Medal of Honor?Why was the Service Module Retained?Why was the Apollo 6 service module painted white?How different was the Apollo LM descent trajectory from the most fuel-efficient?Was Arthur J. Schwaniger one of very few US born NASA scientists using metric units?
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Why was the LRV's speed gauge displaying metric units?
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Why was the LRV's speed gauge displaying metric units?
Why did NASA use U.S customary units?Is true that Armstrong was not designated as first to walk on the moon?How was dust-mitigation addressed during the Apollo program?What was Apollo 11's reentry speed at parachute deployment?Why did Armstrong pilot the LM, when Aldrin was tasked as Lunar Module Pilot?How intrusive was the Apollo Master Alarm system?Why was Buzz Aldrin not Awarded the Congressional Space Medal of Honor?Why was the Service Module Retained?Why was the Apollo 6 service module painted white?How different was the Apollo LM descent trajectory from the most fuel-efficient?Was Arthur J. Schwaniger one of very few US born NASA scientists using metric units?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
In the question Why did NASA use U.S customary units? it was basically stated in the answers that even when metric units were used "internally" (e.g. the AGC), the units presented to the astronauts were in English Engineering Units/U.S. Customary Units, probably because that's what the astronauts – most of them (test) pilots – were most familiar with.
But there is one oddball, as I just found out: the Lunar Roving Vehicle's speed gauge was displaying kilometers per hour instead of miles per hour:
(cropped version of full image of the LRV console)
But why? Is there anything known about this design detail?
apollo-program rovers lunar-landing
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
$endgroup$
|
show 10 more comments
$begingroup$
In the question Why did NASA use U.S customary units? it was basically stated in the answers that even when metric units were used "internally" (e.g. the AGC), the units presented to the astronauts were in English Engineering Units/U.S. Customary Units, probably because that's what the astronauts – most of them (test) pilots – were most familiar with.
But there is one oddball, as I just found out: the Lunar Roving Vehicle's speed gauge was displaying kilometers per hour instead of miles per hour:
(cropped version of full image of the LRV console)
But why? Is there anything known about this design detail?
apollo-program rovers lunar-landing
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
$endgroup$
5
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
2
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
$endgroup$
– Organic Marble
15 hours ago
3
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
$endgroup$
– Uwe
15 hours ago
1
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
6
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago
|
show 10 more comments
$begingroup$
In the question Why did NASA use U.S customary units? it was basically stated in the answers that even when metric units were used "internally" (e.g. the AGC), the units presented to the astronauts were in English Engineering Units/U.S. Customary Units, probably because that's what the astronauts – most of them (test) pilots – were most familiar with.
But there is one oddball, as I just found out: the Lunar Roving Vehicle's speed gauge was displaying kilometers per hour instead of miles per hour:
(cropped version of full image of the LRV console)
But why? Is there anything known about this design detail?
apollo-program rovers lunar-landing
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
$endgroup$
In the question Why did NASA use U.S customary units? it was basically stated in the answers that even when metric units were used "internally" (e.g. the AGC), the units presented to the astronauts were in English Engineering Units/U.S. Customary Units, probably because that's what the astronauts – most of them (test) pilots – were most familiar with.
But there is one oddball, as I just found out: the Lunar Roving Vehicle's speed gauge was displaying kilometers per hour instead of miles per hour:
(cropped version of full image of the LRV console)
But why? Is there anything known about this design detail?
apollo-program rovers lunar-landing
apollo-program rovers lunar-landing
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
asked 15 hours ago
DarkDustDarkDust
8,6933 gold badges38 silver badges62 bronze badges
8,6933 gold badges38 silver badges62 bronze badges
5
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
2
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
$endgroup$
– Organic Marble
15 hours ago
3
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
$endgroup$
– Uwe
15 hours ago
1
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
6
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago
|
show 10 more comments
5
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
2
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
$endgroup$
– Organic Marble
15 hours ago
3
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
$endgroup$
– Uwe
15 hours ago
1
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
6
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago
5
5
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
2
2
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
$endgroup$
– Organic Marble
15 hours ago
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
$endgroup$
– Organic Marble
15 hours ago
3
3
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
$endgroup$
– Uwe
15 hours ago
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
$endgroup$
– Uwe
15 hours ago
1
1
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
6
6
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago
|
show 10 more comments
2 Answers
2
active
oldest
votes
$begingroup$
The LRV was at least partially metric.
But they used a mix of metric and US customary units. Temperatures in Fahrenheit. But when you decide to use km for distances, you have to use km/h for speed.
Snippets from this paper.
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
$endgroup$
add a comment |
$begingroup$
The entire Lunar Roving Vehicle Operations Handbook (PDF, 38 Mb) is in meters. The only mention of "foot" is when talking about the astronauts' footrests, and "feet" does not appear at all. Kinda unexpected, considering that Boeing was the rover contractor.
Section 1.5.6 describes the Speed Indicator:
The instrument shows LRV velocity from 0 to 20 km/hr. This display is driven from the odometer pulses from the right rear wheel, through the SPU.
The document confirms that the speed indicator and directional gyro are analog devices. However, the rest of the Signal Processing Unit is digital.
The odometer is even more interesting:
Odometer pulses from all four wheels enter the odometer logic via the SPU line receivers. This logic selects the third fastest wheel for use in the distance computation. This insures that the odometer output pulses will not be based on a wheel which is locked, nor will they be based on a wheel that has excessive slip.
The odometer and the directional gyro are fed into a digital processor which calculates and accumulates the delta-North and delta-East, which is then converted back into range and direction indicators (showing how to get back to the LM).
All distances (even the turning radius) is in meters.
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
$endgroup$
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
add a comment |
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2 Answers
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2 Answers
2
active
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$begingroup$
The LRV was at least partially metric.
But they used a mix of metric and US customary units. Temperatures in Fahrenheit. But when you decide to use km for distances, you have to use km/h for speed.
Snippets from this paper.
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
$endgroup$
add a comment |
$begingroup$
The LRV was at least partially metric.
But they used a mix of metric and US customary units. Temperatures in Fahrenheit. But when you decide to use km for distances, you have to use km/h for speed.
Snippets from this paper.
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
$endgroup$
add a comment |
$begingroup$
The LRV was at least partially metric.
But they used a mix of metric and US customary units. Temperatures in Fahrenheit. But when you decide to use km for distances, you have to use km/h for speed.
Snippets from this paper.
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
$endgroup$
The LRV was at least partially metric.
But they used a mix of metric and US customary units. Temperatures in Fahrenheit. But when you decide to use km for distances, you have to use km/h for speed.
Snippets from this paper.
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
edited 13 hours ago
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
answered 14 hours ago
UweUwe
14.2k2 gold badges39 silver badges64 bronze badges
14.2k2 gold badges39 silver badges64 bronze badges
add a comment |
add a comment |
$begingroup$
The entire Lunar Roving Vehicle Operations Handbook (PDF, 38 Mb) is in meters. The only mention of "foot" is when talking about the astronauts' footrests, and "feet" does not appear at all. Kinda unexpected, considering that Boeing was the rover contractor.
Section 1.5.6 describes the Speed Indicator:
The instrument shows LRV velocity from 0 to 20 km/hr. This display is driven from the odometer pulses from the right rear wheel, through the SPU.
The document confirms that the speed indicator and directional gyro are analog devices. However, the rest of the Signal Processing Unit is digital.
The odometer is even more interesting:
Odometer pulses from all four wheels enter the odometer logic via the SPU line receivers. This logic selects the third fastest wheel for use in the distance computation. This insures that the odometer output pulses will not be based on a wheel which is locked, nor will they be based on a wheel that has excessive slip.
The odometer and the directional gyro are fed into a digital processor which calculates and accumulates the delta-North and delta-East, which is then converted back into range and direction indicators (showing how to get back to the LM).
All distances (even the turning radius) is in meters.
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
$endgroup$
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
add a comment |
$begingroup$
The entire Lunar Roving Vehicle Operations Handbook (PDF, 38 Mb) is in meters. The only mention of "foot" is when talking about the astronauts' footrests, and "feet" does not appear at all. Kinda unexpected, considering that Boeing was the rover contractor.
Section 1.5.6 describes the Speed Indicator:
The instrument shows LRV velocity from 0 to 20 km/hr. This display is driven from the odometer pulses from the right rear wheel, through the SPU.
The document confirms that the speed indicator and directional gyro are analog devices. However, the rest of the Signal Processing Unit is digital.
The odometer is even more interesting:
Odometer pulses from all four wheels enter the odometer logic via the SPU line receivers. This logic selects the third fastest wheel for use in the distance computation. This insures that the odometer output pulses will not be based on a wheel which is locked, nor will they be based on a wheel that has excessive slip.
The odometer and the directional gyro are fed into a digital processor which calculates and accumulates the delta-North and delta-East, which is then converted back into range and direction indicators (showing how to get back to the LM).
All distances (even the turning radius) is in meters.
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
$endgroup$
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
add a comment |
$begingroup$
The entire Lunar Roving Vehicle Operations Handbook (PDF, 38 Mb) is in meters. The only mention of "foot" is when talking about the astronauts' footrests, and "feet" does not appear at all. Kinda unexpected, considering that Boeing was the rover contractor.
Section 1.5.6 describes the Speed Indicator:
The instrument shows LRV velocity from 0 to 20 km/hr. This display is driven from the odometer pulses from the right rear wheel, through the SPU.
The document confirms that the speed indicator and directional gyro are analog devices. However, the rest of the Signal Processing Unit is digital.
The odometer is even more interesting:
Odometer pulses from all four wheels enter the odometer logic via the SPU line receivers. This logic selects the third fastest wheel for use in the distance computation. This insures that the odometer output pulses will not be based on a wheel which is locked, nor will they be based on a wheel that has excessive slip.
The odometer and the directional gyro are fed into a digital processor which calculates and accumulates the delta-North and delta-East, which is then converted back into range and direction indicators (showing how to get back to the LM).
All distances (even the turning radius) is in meters.
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
$endgroup$
The entire Lunar Roving Vehicle Operations Handbook (PDF, 38 Mb) is in meters. The only mention of "foot" is when talking about the astronauts' footrests, and "feet" does not appear at all. Kinda unexpected, considering that Boeing was the rover contractor.
Section 1.5.6 describes the Speed Indicator:
The instrument shows LRV velocity from 0 to 20 km/hr. This display is driven from the odometer pulses from the right rear wheel, through the SPU.
The document confirms that the speed indicator and directional gyro are analog devices. However, the rest of the Signal Processing Unit is digital.
The odometer is even more interesting:
Odometer pulses from all four wheels enter the odometer logic via the SPU line receivers. This logic selects the third fastest wheel for use in the distance computation. This insures that the odometer output pulses will not be based on a wheel which is locked, nor will they be based on a wheel that has excessive slip.
The odometer and the directional gyro are fed into a digital processor which calculates and accumulates the delta-North and delta-East, which is then converted back into range and direction indicators (showing how to get back to the LM).
All distances (even the turning radius) is in meters.
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
answered 9 hours ago
DrSheldonDrSheldon
12.6k3 gold badges48 silver badges110 bronze badges
12.6k3 gold badges48 silver badges110 bronze badges
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
add a comment |
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
1
1
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
$begingroup$
But temperatures are Fahrenheit, inch is used 16 times, pressures are psi, weights in pounds and lbs. Not fully metric. Not all distances are in meters, inches are used instead of centimeters or millimeters.
$endgroup$
– Uwe
9 hours ago
1
1
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
$begingroup$
I didn't say that it was only metric, nor did I imply that the dimensions of the parts were metric. But every measure of the motion of the rover (speedometer, odometer, range) was in meters. Read the manual.
$endgroup$
– DrSheldon
8 hours ago
add a comment |
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5
$begingroup$
@StarMan No converting to U.S customary units was necessary, just a replacement of the analog scale of the speed gauge.
$endgroup$
– Uwe
15 hours ago
2
$begingroup$
@ManuH in non-US countries, do automobiles display their speed to the driver in m/s?
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– Organic Marble
15 hours ago
3
$begingroup$
The speed gauge looks like a simple moving coil meter to indicate analog current or voltage. Nothing digital, no semiconductors. Just an electromechanical meter used during the sixities and seventies.
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– Uwe
15 hours ago
1
$begingroup$
@OrganicMarble I'm pointing out that the hour is not a base unit of the metric system. I still wonder why no car seems to use metric system (could be a good question on other SE site)
$endgroup$
– Manu H
15 hours ago
6
$begingroup$
@ManuH Automobile speedometers display distance-per-hour rather than distance-per-second because they are frequently used to transport people to appointments and events which are scheduled in hours and coarse fractions of hours, rather than in seconds. If speed was given in meters per second, SI would make it easy enough to slip the decimal to work with kilometers, but offers no help in the 3600:1 seconds-to-hours conversion. If we used decimalized time, then we might see meters-per-second speedometers.
$endgroup$
– Russell Borogove
14 hours ago