Learn about Altimeter Errors and understand what causes them in 5 minutes.
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- Опубліковано 27 тра 2024
- Easily learn why an altimeter will lie to you, and what you can do to make sure it is always accurate. I have helped hundreds of future pilots pass their practical test with knowledge like this. This is a common sense approach to understanding your altimeter. Quick and easy to learn.
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I am study9ing for my knowledge test and this is a very good explanation. It makes sense, I just need to commit the fundamentals to memory and not react but think through the questions. I loved "Where does the altimeter think it is?" Very helpful!
Mark, I’m glad it was helpful. I’m taking a break from flying for a year and posting videos on the channel about our adventures buying a sailboat here in Croatia.
Great video explaining altimeter errors!
This is good stuff. I subscribe as I am finishing my CFI FW RW now. Not vary many guys out there can talk both.
Great explanation! I will not miss any questions anymore about altimeters!!
Great videos. Thank you. It is important to point out that an altimeter does not actually respond to temperature. Yes, cold air is associated with lower atmospheric pressure and hot air is associated with higher pressure. But if you park your aircraft at on a ramp in the afternoon and the temp is 30 degrees and a pressure of 30.10, if the air cools down to 15 degrees but the pressure is still 30.10, the altimeter will read the exact same altitude. The “Look out below” warning is because of this association only.
Cold air is associated with HIGH atmospheric pressure.
@@raulvillaplanarugby no, cold areas has low pressure and warm areas has high pressure....cold area also higher altitude and warm areas has lower altitude.
*solid video, great illustrations too. Thank you!* :)
Watching this finally made it click! Thank you very much!
Best explanation out there on this subjet for sure! Thank you!
So glad it helped! If you have a minute check out our latest craziness we’re up to: Sailing to Hvar
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Thank you for this explanation! I was having trouble wrapping my head around the concept. Understanding the mechanics of the altimeter and "putting myself in its shoes" to envision what it's thinking when the plane moves to areas changing temperatures and pressures certainly helped! Thank you!
Thanks so much for the complement!
I concur. Thank you.
Very good presentation thanks makes sense now
The best video on this topic!
Your explanations are the best I have come across. Please do more videos. Some systems videos would be awesome 👏
I will as soon as we get back from sailing. Great idea about the systems! Check out what we are up to now… When you need a bigger plug- Make it!
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Excellent, helping me study for the written.
Best freaking explanation ever! Great teacher
Best freaking compliment, ever! Thanks
Simply awesome. Thanks so much.👍
Thanks Thomas
best explanation!!! I watched other videos too but yours was just the best explaining everything in the simpliest way possible..thank y
Glad it was helpful. Please subscribe and share:)
I finally get it. Thank you. Very good explanation.
Samadzai, glad it was helpful! Thanks for watching
Thank you Vince, very nicely explained
Glad it was helpful. I am on a one year break from flying, but I will be back to flying after our sailing adventure is done. Check out our other adventure videos:)
THANK YOU FOR THE VIDEO!!!!! MAKE MORE PLEASEEEE!
Great video 👍 Thank you
Thanks, Glad you enjoyed it
Dude- you are Awewome!!!
Thanks, glad it was helpful
One thing that I can't wrap my head around is how the altimeter "thinks" about temperature if it has no thermometer.
Instead I think cold air = higher density = more pressure... therefore it will read lower since there is more air pressure at lower altitudes. And vice-versa. Please explain if able.
So this might help: the device has a sealed wafer inside. I use the phrase “where does it think it is” because to read changes, it must display the difference between the wafer(independent of exterior forces) and the ambient air(exterior) Hot to Cold- look out below; would that be correct in the example you gave? If you fly into a colder airmass without adjusting the altimeter, it will read higher. Hanse, the phrase “look out below “
The altimeter doesn't really think about temperature other than it was calibrated for standard temperature. The only two variables for the altimeter are the weight (pressure) of the air above the static port and the barometer setting.
Having said that, the temperature questions on the FAA exam are confusing for two main reasons: One, we think of colder days as being high pressure days and warm days as being lower pressure days (which is true) AND because a bit of important information is left out: The temperature is changing in the question, but the PRESSURE at sea level is not. So when the temperature is changing the pressure at sea level, then the altimeter error is related to pressure. When the temperature changes, but the pressure at sea level doesn't change, it's a different story.
So what happens when you go from warmer air to colder air, but the pressure at sea level doesn't change? The pressure levels and lapse rates change: They are expanded in warmer air and contracted in cooler air. If you look at diagram 8-3 in the Pilot's Handbook of Aeronautical Knowledge it will make more sense IF you remember that going from left to right in that diagram the pressure at sea level does not change.
To go even a bit deeper. If the pressures at sea level for two given columns of air are the same, and those two columns of air have different temperatures, the warmer column will be taller than the colder column. The very top of the atmosphere is not uniform. Hope that helps.
Great explanations, probably the best and most understandable I have ever seen. However, I think it was a little rushed in the presentation. It may have been a little easier to follow it there was a little longer time to be able to mentally process the information. Still, all in all, it was a great video!
@@Loves2Fly Yes, that is my suggestion. I think the speed of your speaking could be slowed down just a tad, and like you said, a bit of time between the examples would be beneficial. I think the speed with which you are "drawing" the examples is great because you are displaying everything without wasting, so to speak, time waiting to actually "see" the example. Speaking a little slower would probably allow the viewer to process what you are presenting. I did subscribe to your channel and am looking forward to watching your other presentations in the aviation related videos.
@@Loves2Fly You're very welcome. I am glad that you were receptive to my suggestions.
With all due respect sir, i understand what your’e saying and the reasons for it but i’d like too point out that this is a video for a reason, you can pause and have time to mentally process the information at any point. I thought the flow and pace of the video was more than phenomenal
@@pando4433 I can understand where you are coming from, and you suggestion to just pause the video when needed by the viewer. I certainly cannot speak for anyone else, but it has been my experience that if I need to pause a video more than a time or two, I will then pause it (permanently) by looking for another video on the subject. But, that is just me. I feel there are others who would possibly do the same. Just my thoughts.
A little slow for my taste but VERY informative and I appreciate this!
Thank you!
You are welcome Stewart
Great video! Though I'm having trouble with something. It is well known that with warm air there are low pressures and with cold air there are high pressures. But when looking at the altimeter error (even in the Jeppssen book) it says that with warm air there are high pressures! I don't really understand. Anyone can help?
Thanks for the great question! Yes, you are right there can be cold low pressure and high temperature high pressure depending on the air mass over the airport. The principles are really just generalizations to help you understand what happens to the altimeter during pressure and temperature changes. It is really a moot point if you just keep your altimeter setting accurate to the closest airport and then your altimeter will be correct regardless of the temperature except for in extreme cases.
@@Loves2Fly Thank you very much! You have been really helpful!
Thank you for your explanation, it is a great way to illustrate Altimeter Errors.
Doesn't cold air hold more air molecules (denser) thus causing it to have more pressure? Referencing 3:23 on the video. I am very confused.
@@Loves2Fly I understand now. I was very confused about a very simple idea haha! Density is the result of air pressure and the air molecules in that column of air. As you increase in altitude, density decreases due to the lack of air molecules (less air pressure) regardless of it being cold or hot density is the result of how much air molecule is even in the air to begin with. A cold temperature on the surface will have more air molecules and more pressure than cold temperature as altitude increases.
Thank you.
*correct me if I am wrong here
@@bryanc3236 hey, your explanation is great! I'm in instrument training and nearly done, and I'm still confused about this sometimes., I think your explanation is great!
@@abbieamavi good luck! Ask me any questions if you have.
@@bryanc3236 thank you!
From hi to low pressure or temperature, the aneroid wafers in the instrument expand and register a climb. If the trapped air in the diaphragm is colder is would seem to shrink. However, the diaphragm is within the heated cockpit area and its temp stays relatively the same while the outside air within the static feed cools, becomes more dense and presses on the diaphragm less--thus allowing the diaphragm to expand as in the case of lower pressure. As explained, when a climb is indicated, the pilot will fly lower to maintain indicated alt and descend to a lower true alt. Just my 2 cents.
Great video, I wish I would of had this link while I was instructing. This could of helped a lot of guys out!
Make more videos please!!!
What the “Pilot Handbook of Aeronautical Knowledge” does it all mean
If your flying into colder then ISA temps and coupled onto an ILS... I would expect the altimeter to read a lower altitude on the Glide slope due to colder dense air... i would say the altimeter is “under reading” your actual height.
The text books say this the altimeter will be over reading? What.
@@Loves2Fly thanks for the (quick) reply!Edit; I’m stupid.
Ok nvm. I have misread the question and it’s killed me.
I THOUGHT they were flying the glide slope. But they are passing the outer marker as per the altimeter required height.
Which means the answer they are looking for is opposite to what I wanted to give. Yes high to low look out below! This will indeed mean you are low on the glide slope and the altimeter will be over reading.
RTFQ
Thanks for your input! And also the video is great to cement theories!
you the goat
Thank you
Can someone explain to me what is hysteresis? pleaaaaaaseeeee
Not me. I have no idea
GREAT VIDEOS, KEEP GOING LIKE THIS!!!! But please speak a little bit slower. i mean the pace of your voice. Your English is clear and explanation is great but you speak too fast and it is difficult to follow the whole information you give, and the information is very useful! thank you again!
Learn what causes Altimeter errors in 5 mins…….. The video is 8+ minutes long! 😆😆 sorry, couldn’t help myself.
Pilot math lol