Pressure and Density Altitude: Boldmethod Live

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How do you calculate pressure and density altitude, and how do they affect your aircraft. Tune in, ask your questions, and find out!
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[@flycow69]

Time has changed. I used to binge watch M*A*S*H the 4077 series, then WINGS the TV series of Sandpiper Airline from Nantucket. Now I binge watch Boldmethod videos. Keep up the good work.

[@Boldmethod]

Thanks Frank!

[@samuel-jq9wl]

One of the most under rated channels on KZbin. Fell in love with your first video.

[@DownTheRabbit-Hole]

Great presentation. I might add this: At about 24:40 the presenter talks about flying isobars above 18k ft by setting 29.92 pressure altitude. NWS uses the term "isobar" to describe lines of equal pressure on a Surface analysis chart. When they refer to the lines on a constant pressure chart, say 500mb, 18k, NWS refers to them as "height contours". I know this is a bit nuanced, but it might help understand and differentiate those squiggly lines on surface charts as opposed to upper air constant pressure charts. In other words, at or above 18k, setting 29.92 PA ATC requirement, all aircraft are riding up and down "height contours" not isobars.

[@Boldmethod]

Thanks David!

[@Treadstone7]

Good point. The correct meteorological term would be "isohypses".

[@AaronWbirdman]

This was great! Love love love Bold Method!!!!!!!!

[@saewonyi]

Wow even though I have my private pilot license and understood the book definitions of this topic, this video really made everything just click, awesome work

[@chrisgeskey7581]

Wow! This really cleared up a couple points I’ve had questions on concerning Density and Pressure Altitudes. Great video!! THANK YOU!

[@johnsquier688]

Excellent, one of if not the BEST explanation I have seen... Thank You!!!! Check ride this Sunday

[@cokeforever]

As you were answering the 'cant they automate altimeter' question, I believe it would be appropriate to say that altimeter measures altitude relatively to something: sea level, airport elev and maybe talk a little on qnh/qfe... Novice aviators usualy have at least some degree of difficulty understanding qnh/qfe and grasping this concept really helps self-answer the 'automation' question

[@benw2459]

So from my understanding, changes in air pressure are caused by changes in density. Changes in density are caused primarily by changes in temperature. So the pressure (I think) already takes into account temperature. So why doesn't pressure altitude account for temperature? If temperature is a factor of density, and therefore pressure, shouldn't pressure altitude already take temperature into account? I understand that pressure does not equal density, and using the ideal gas law, if temperature increases but pressure stays the same, density must decrease. But if temperature affects both density and pressure, how can an increase in temperature NOT affect pressure?

[@paulovenz8037]

This Video is Brilliant, so easy to understand, absolutely brilliant

[@Mark_Texas]

Please keep doing these!

[@Boldmethod]

We will Mark!

[@HarrySingh-pd6lk]

Why do performance charts use pressure altitude and not density altitude. Since density altitude takes temperature into account. Wouldn’t it be a more accurate indicator of what the airplane will feel.

[@MrSixstring2k]

Amazing demonstration, keep them coming.

[@konradgwizdz4272]

16:30 - I am not 100% sure, but as far as I know typical analogue altimeter has a non-linear mechanism inside it, that it indicates the altitude according to the logarithmic H and p relation as ISA describes. Therefore, the thing that causes the main instrument error is just the local atmosphere pressure gradient different then this logarithmic graph.

[@konradgwizdz4272]

I mean that the aneroid mechanism inside it does not present a linear movement of 27ft of indication per hPA

[@bogdan_n]

Just one thing. The 29.95inHg pressure is NOT a middle number, it's a reference pressure. 29.921 inHg equals 1013.25 hPa, or 760 mmHg, or 1 atm, and is the atmospheric pressure at sea level, at 45 deg latitude, at a temp of 0° C. In meteorology that is called "normal atmospheric pressure".

[@johnthompson286]

I do like the way you explain things. Thanks

[@VikashGupta_i]

31:27 For Density Altitude

[@albundi2985]

This is going to make FS2020 so much more meaningful and fun. Thanks.

[@RastaPilot737]

IKR! More since they are accounting for pressure temp and humidity into the flight model, with the new weather engine... Amaizing

[@JavierRamirez-ki1bi]

Guys, please start doing this again

[@themilehighguy1119]

Great video! I would have used the actual altimeter setting for Denver instead of using a made up one as 29.92 is standard for sea level and Denver is much higher than sea level.

[@fanoooooo6]

well done buddy excellent video , from the uk , God bless

[@cs512tr]

these are neat! any chance you could use hPa in some of these demonstrations for us in australia?

[@t-pain3343]

NZ is better at rugby!

[@georgia_dawgs_2746]

Awesome video. One question though, why exactly does the altimeter increase in altitude with higher pressure and decrease with lower pressure? It’s probably me just overthinking everything but I just want to know the reason behind it.

[@casper6263]

Very good presentation on density altitude . Keep up the good work.

[@XploraMundoSinFronteras]

You guys are incredible !! Thank you !!

[@orangebetsy]

i wonder what we'd need on Mars to take off and fly around. Assuming we picked a spot where it was Earth-like temps at the time, as -140 deg F ain't gonna work at all. A Cessna 172 in the atmosphere devoid of humidity and pressure much lower i think...maybe it would need a greater speed to take off? Average surface pressure on Mars is 6-7 millibars or 0.17718 inches of Hg!

[@piwrin4507]

Great video as always

[@ottohahn7160]

awsome video guys!! really helped me out...

[@vitomokhtar423]

great, thank you man ur the best

[@richardheinichen8279]

Great instruction. Thanks A lot.

[@jakew9887]

Great Video. Thanks

[@daneandersen8181]

Very helpful!

[@joedowning1434]

Excellent presentation. I am wondering how u imputed the performance data charts into ForeFlight???

[@zoozolplexOne]

cool !!!

[@toutestvanite]

Best explanation yet🤘

[@joshuascull6128]

if my density alt is 3200ft and im at 4300ft does that mean im good or worse

[@treehuggerjoe9795]

I believe is the crapy introduction.. an introduction without sound and for six minutes is a deal-breaker for most people.

[@Jay-po4kh]

I like the new Music