Ok so I am really struggling for some reason to pick this part of altitude/altimeter reading up. Any help would greatly be appreciated, hints, rules of thumb etc...
1. If you have your altimeter subscale set to a specific pressure and you fly into a area of lower pressure, if you don't adjust your subscale, what will your instrument read?
2. If you have your altimeter subscale set to a specific pressure and you fly into a area of higher pressure, if you don't adjust the subscale, what will your instrument read?
I know this is basic stuff but for some reason I just can't get my head around it
Altitude Heights
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- Gold Wings
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- Joined: Nov 2013
- mdav
- 1st Dan
- Posts: 232
- Joined: Aug 2007
Re: Altitude Heights
If you flew from a place with high pressure to a place of low pressure without adjusting the altimeter, a constant altitude will be displayed, but the actual height of the aircraft above the ground would be lower then the indicated altitude. The same go's the other way from low to high in this case the actual altitude of the aircraft is higher than the indicated altitude.
Remember this GOING FROM A HIGH TO A LOW, LOOK OUT BELOW
Non standard Temp also effects it, so if you think of it like your body, if scotty beamed you to a cold place you would think you are on a mountain top thus low pressure area so your lower then the altimeter, if he beamed you to a warm place you would think your down near the beach thus high pressure area and you will be higher the altimeter.
Thats my understanding of it all. Lower your lower, Higher your higher.
Remember this GOING FROM A HIGH TO A LOW, LOOK OUT BELOW
Non standard Temp also effects it, so if you think of it like your body, if scotty beamed you to a cold place you would think you are on a mountain top thus low pressure area so your lower then the altimeter, if he beamed you to a warm place you would think your down near the beach thus high pressure area and you will be higher the altimeter.
Thats my understanding of it all. Lower your lower, Higher your higher.
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- Silver Wings
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Re: Altitude Heights
From high to low you'll be high
From Low to High youll be low
From Low to High youll be low
- Eric Hunt
- 3rd Dan
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Re: Altitude Heights
It's a very badly worded question - the altimeter reading, if you are trying to maintain a constant indicated altitude, will stay the same.
What they mean to say is, will it over-read or under-read? As stated above
LOW TO HIGH, UP YOU FLY. HIGH TO LOW, DOWN YOU GO.
I recall one of the 5 Squadron quiz questions went a bit like this:
"If you fly from a high pressure area to a low pressure area, what will the altimeter read?
a. The Canberra Times
b. etc"
What they mean to say is, will it over-read or under-read? As stated above
LOW TO HIGH, UP YOU FLY. HIGH TO LOW, DOWN YOU GO.
I recall one of the 5 Squadron quiz questions went a bit like this:
"If you fly from a high pressure area to a low pressure area, what will the altimeter read?
a. The Canberra Times
b. etc"
- mdav
- 1st Dan
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- Joined: Aug 2007
Re: Altitude Heights
wingznbladez wrote:From high to low you'll be high
From Low to High youll be low
Just so others don't get confused wingz can I add something, yes your right but you'll won't be higher, the altimeter is, your as in the aircraft is actually lower then the altimeter reading.
So to the original poster another way to look at it if you did a time lapse of the alt while your on the ground and a storm is coming you will see the alt climb as the storm moved over
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- Silver Wings
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- Joined: Dec 2014
Re: Altitude Heights
mdav wrote:wingznbladez wrote:From high to low you'll be high
From Low to High youll be low
Just so others don't get confused wingz can I add something, yes your right but you'll won't be higher, the altimeter is, your as in the aircraft is actually lower then the altimeter reading.
So to the original poster another way to look at it if you did a time lapse of the alt while your on the ground and a storm is coming you will see the alt climb as the storm moved over
spot on mate, sorry i was ac bit casual with my answer
- Ben Slocombe
- Silver Wings
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- Joined: Dec 2012
Re: Altitude Heights
It might be easier for you to look at it in another way.
If the heli climbs you are effectively going from a high pressure to a low pressure, and thus the altimeter will increase.
So if you are going from a high pressure to a low pressure while maintaining same height then your altimeter will also climb. Your altimeter will be reading higher than you actually are
If the heli climbs you are effectively going from a high pressure to a low pressure, and thus the altimeter will increase.
So if you are going from a high pressure to a low pressure while maintaining same height then your altimeter will also climb. Your altimeter will be reading higher than you actually are
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- Silver Wings
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Re: Altitude Heights
Altitude = distance above sea level
Height = distance above the ground
Height = distance above the ground
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- Silver Wings
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Re: Altitude Heights
High to Low_Gauge reads High, You are Lower.
Low to High _Gauge reads Low, You are Higher.
Low to High _Gauge reads Low, You are Higher.
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- Gold Wings
- Posts: 108
- Joined: Nov 2013
Re: Altitude Heights
Thank you everyone for your help. I have now finally got my head around it, it was greatly appreciated!
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- 1st Dan
- Posts: 288
- Joined: Nov 2012
Re: Altitude Heights
Google Luiz Montero simulator.
Besides some IFR stuff, there's good 'sim' on altimetry errors, with user able to change data to see the 'effect'.
Besides some IFR stuff, there's good 'sim' on altimetry errors, with user able to change data to see the 'effect'.
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