Ah, well, I don't know that I fully agree.

I watch channels that are people building things, repairing tools, or goofing around in an easy-going way without a lot of product placement or sponsored content.

And yet, all of the recommendations I get are either sponsored unboxing videos with AI voiceovers or click-baity channels with ugly reaction faces in the video thumbnails. I guess those probably make more money for Google.

Only for a short period between rotation and liftoff. Most of the takeoff roll is spent building up horizontal speed; the pilot doesn't command the aircraft to pitch up before it's ready to lift off.

The concrete they use is very precisely mixed to a specification and then it’s tested for adherence to the spec.

A runway is also going to be 3-4x thicker than a 4-6” thick driveway slab. Probably they also use fiberglass or PVC coated rebar instead of plain steel rebar.

Definitely not an expert here but I can read a civil site plan and hire civil site work subcontractors frequently.

Here’s some information on concrete testing: https://www.concrete.org/frequentlyaskedquestions.aspx?faqid...

Also, Grady is one of the best creators on YouTube, I can’t help but watch his full videos whenever they pop up. I always learn something, even if I’m familiar with the subject.

Edit: Granite is not one of the listed materials in Part 4 - Base Courses of the FAA runway construction guide, here’s the entire thing for reference - https://www.faa.gov/airports/engineering/construction_standa...

Granted private driveways don't need to be absolutely perfect, but if you want it to last for a really long time you need deeper base layers.

1) when an airliner lands, the undercarriage legs, which are telescopic sprung and damped struts, spread the vertical deceleration over a finite period (I cannot say how long it lasts, but I would say of the order of a second or so.)

2) At the point of touchdown, the wings are generating lift about equal to the aircraft’s weight. This decreases quite rapidly, largely on account of the decease in angle of attack as the nosewheel comes down and from the deployment of spoilers, but it would be mistaken to think that the runway is immediately supporting the full weight of the airliner after touchdown.

3) On takeoff, until the nosewheel is lifted to initiate rotation, a significant fraction of an airliner’s weight is being supported by the runway. During rotation, as the angle of attack increases, the lift increases [1] until it exceeds the weight, at which point the airliner lifts off.

4) If we ignore the fact that the undercarriage is sprung, then the airliner has no vertical velocity until it lifts off. Right at that point, however, when the lift exceeds the weight, it gains a vertical acceleration.

I hope this helps!

[1] Plus a vertical component of the engine thrust, but no airliner rotates to anything like 45 degrees - in fact, if it has not left the ground at a rotation angle equal to the angle of maximum lift coefficient (~10 - 15 degrees), it is not going to do so without going faster.

If you don't then I'm sure it's better than nothing but idk if stock footage is where you should be developing your mental model of how a tire hydroplanes or how a paved transfers load into what's below it.

For example that hydroplaning is a real consequence on runways; or that higher takeoff weight has an order of magnitude greater effect on runway wear than the shear force of braking during landing.

I also learn from Grady's phenomenal skill at communicating technical concepts from our field in layman accessible terms! Most times I prefer to watch his videos and appreciate what he does, but there are days that I'm in the mood to read rather than watch. I'm glad that he gives us that option.

I was pretty disappointed that he doesn't discuss the EMAS mechanics, structure, actual stopping distance, or impact to the plane in nearly any real way.

He does show a LOT of animation of layered runways, which are mostly not that informative.

There is some decent discussion around maintenance and material choice, and some very basic discussion of infrastructure requirements outside of the runways themselves that's... ok.

Overall... I thought this was a solid C+ video. It shows planes plowing into an EMAS, then does jack all to discuss that, while bringing up a lot of less interesting discussion of runway building (which despite the claims in the video, do actually correspond very highly to how we build highways, just with different weight/maintenance requirements.)

(Some planes have no problem with it, though. You can make even the entire runway of gravel if you only fly those.)

Lots of obstructions near the runway - signs, lights, aerial masts, meteorological equipment, fences - are supposed to be "frangible" [1]. They must break into pieces less likely to cause damage to an aircraft in a high-energy collision. There's a heck of a lot of GFRP used in lieu of metal around an airfield.

1. ICAO Doc 9157, particularly part 6.