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spcialeffects
Joined: 29 Aug 2012
Posts: 306
Location: Kent
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 Posted: Sun Dec 08, 2013 10:42 am Post subject: Altimeter |
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Ladies and gentlemen of the forum, not sure if this is a stupid question or not but I don't know the answer and so hoped someone a little more knowledgeable than me could enlighten me with the answer. If an altimeter only reads up to 10000ft what happens to it if you go to say 12/15000ft? Will it blow up? Does it not have a quantified amount of air in a chamber which expands the higher you go? The reason I ask the question is that I am going to have a glass cockpit (dynon skyview) but need an old style altimeter as a back up. There's one that reads up to 10000ft for £280ish but the same one reading up to 20000ft is £780ish! £500 difference is quite a lot so that's the reason for my question, that's not to say I'm going flying over 10000ft all the time. Thanks Frank
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Sun Dec 08, 2013 11:10 am Post subject: Altimeter |
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On Dec 8, 2013, at 10:42 AM, spcialeffects wrote:
| Quote: | | If an altimeter only reads up to 10000ft what happens to it if you go to say 12/15000ft? Will it blow up? Does it not have a quantified amount of air in a chamber which expands the higher you go? The reason I ask the question is that I am going to have a glass cockpit (dynon skyview) but need an old style altimeter as a back up. There's one that reads up to 10000ft for £280ish but the same one reading up to 20000ft is £780ish! £500 difference is quite a lot so that's the reason for my question, |
Frank...I can't answer your questions, but would suggest you look further for a moderately priced altimeter...I too am fitting the Skyview and have a 2.25" UMA steam gauge (calibrated to 20k feet) for which I paid about $200 USD.
http://www.aircraftspruce.com/catalog/inpages/UMA_altimeters2.php?clickkey=28151
Regards,
Fred
PS: I'm persuaded that there are no stupid questions on this forum.
[quote][b]
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Sun Dec 08, 2013 11:20 am Post subject: Altimeter |
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On Dec 8, 2013, at 10:42 AM, spcialeffects wrote:
| Quote: | | If an altimeter only reads up to 10000ft what happens to it if you go to say 12/15000ft? Will it blow up? Does it not have a quantified amount of air in a chamber which expands the higher you go? The reason I ask the question is that I am going to have a glass cockpit (dynon skyview) but need an old style altimeter as a back up. There's one that reads up to 10000ft for £280ish but the same one reading up to 20000ft is £780ish! £500 difference is quite a lot so that's the reason for my question, |
Frank...I can't answer your questions, but would suggest you look further for a moderately priced altimeter...I too am fitting the Skyview and have a 2.25" UMA steam gauge (calibrated to 20k feet) for which I paid about $200 USD.
Correction: Make that price about $300. USD
http://www.aircraftspruce.com/catalog/inpages/UMA_altimeters2.php?clickkey=28151
Regards,
Fred
PS: I'm persuaded that there are no stupid questions on this forum.
[quote][b]
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asarangan(at)gmail.com
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| Posted: Sun Dec 08, 2013 1:12 pm Post subject: Altimeter |
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I doubt the capsule will blow up if you go higher. May be at 100,000
ft it might. Most likely the 10,000 ft limit has to do with the
calibration range. If you go higher, it may stop moving (if it has an
internal mechanical stop) or it may simply continue reading into the
uncalibrated range, but 11,000 ft may show as 1000 ft. Since this is
really for backup at low altitudes, I would just use it and decide
later if it is worth upgrading.
Alternatively, as Fred pointed out, you can get sensitive altimeters
with three pointers for under USD $300 at aircraft spruce.
On Sun, Dec 8, 2013 at 1:42 PM, spcialeffects <spcialeffects(at)aol.com> wrote:
| Quote: |
Ladies and gentlemen of the forum, not sure if this is a stupid question or not but I don't know the answer and so hoped someone a little more knowledgeable than me could enlighten me with the answer. If an altimeter only reads up to 10000ft what happens to it if you go to say 12/15000ft? Will it blow up? Does it not have a quantified amount of air in a chamber which expands the higher you go? The reason I ask the question is that I am going to have a glass cockpit (dynon skyview) but need an old style altimeter as a back up. There's one that reads up to 10000ft for £280ish but the same one reading up to 20000ft is £780ish! £500 difference is quite a lot so that's the reason for my question, that's not to say I'm going flying over 10000ft all the time. Thanks Frank
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=415133#415133
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paul.the.aviator(at)gmail
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| Posted: Sun Dec 08, 2013 5:58 pm Post subject: Altimeter |
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Hi,
I went down the route of a 3 pointer Altimeter, mechanical ASI and Tru Track ADI for the back up to my GRT Panels, but if I were to do it over again I would use some thing like the Dynon D6 or GRT Mini and run them on a battery back up.
Paul
On Sun, Dec 8, 2013 at 3:11 PM, Andrew Sarangan <asarangan(at)gmail.com (asarangan(at)gmail.com)> wrote:
[quote]--> Europa-List message posted by: Andrew Sarangan <asarangan(at)gmail.com (asarangan(at)gmail.com)>
I doubt the capsule will blow up if you go higher. May be at 100,000
ft it might. Most likely the 10,000 ft limit has to do with the
calibration range. If you go higher, it may stop moving (if it has an
internal mechanical stop) or it may simply continue reading into the
uncalibrated range, but 11,000 ft may show as 1000 ft. Since this is
really for backup at low altitudes, I would just use it and decide
later if it is worth upgrading.
Alternatively, as Fred pointed out, you can get sensitive altimeters
with three pointers for under USD $300 at aircraft spruce.
On Sun, Dec 8, 2013 at 1:42 PM, spcialeffects <spcialeffects(at)aol.com (spcialeffects(at)aol.com)> wrote:
> --> Europa-List message posted by: "spcialeffects" <spcialeffects(at)aol.com (spcialeffects(at)aol.com)>
>
> Ladies and gentlemen of the forum, not sure if this is a stupid question or not but I don't know the answer and so hoped someone a little more knowledgeable than me could enlighten me with the answer. If an altimeter only reads up to 10000ft what happens to it if you go to say 12/15000ft? Will it blow up? Does it not have a quantified amount of air in a chamber which expands the higher you go? The reason I ask the question is that I am going to have a glass cockpit (dynon skyview) but need an old style altimeter as a back up. There's one that reads up to 10000ft for £280ish but the same one reading up to 20000ft is £780ish! £500 difference is quite a lot so that's the reason for my question, that's not to say I'm going flying over 10000ft all the time. Thanks Frank
>
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> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=415133#415133
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