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In a good flight review ground session, a CFI will prioritize topics that are of the most importance to the pilot, particularly with respect to safety. In a mediocre flight review ground session, a CFI will quiz you on the topics that he happens to know off-hand, trivia questions that are in...

http://www.scientificamerican.com/article.cfm?id=graphic-science-radiation-exposure ... Natural background (U.S.) per year: 3.1 ... Airport scanner (backscatter method): 0.0001 ... Dental x-ray: 0.005 Domestic airline flight (five hours): 0.017 Smoking one pack of cigarettes per day...

$49.99 in cash. I will give you the same. -harry

FAR 91.417(b): (b) The owner or operator shall retain the following records for the periods prescribed: (1) The records specified in paragraph (a)(1) of this section shall be retained until the work is repeated or superseded by other work or for 1 year after the work is performed... If...

Because making a specific exception would require a rational, thinking, well-functioning system. So, instead, we're required to keep a piece of paper that has the date of when we last updated the GPS along with the name of who did it. Note that we're not required to maintain a log of all past...

Hmmm, interesting. Hard to see, but it does look like the wings are tied down. Looks like the left tie-down breaks first, the left wing rises up, then the right tie-down breaks and the right wing rises up and then the plane begins moving backwards. The backwards movement is delayed briefly by...

You may need an HP endorsement in order to be able to act as PIC on a particular flight, but you don't need to have that endorsement with you in the plane. In general, there's nothing in your logbook that you're required to have with you while you fly unless you're a student on a solo. -harry

Presumably the drag force is small relative to the lift force as long as the plane has a reasonable angle of attack. As the plane lofts, the nose rises, the angle of attack increases, lift decreases and induced drag increases. -harry

I've never done an update for an 89B, but I do updates for a 94B, and I use a pair of flash cards (I program at home, then just swap at the plane), and a Sandisk Imagemate programmer (model # SDDR-31): http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=290602378576 The cards look like...

Is the conveyor belt on the deck of an aircraft carrier? -harry

Could you pretend to disagree? I'm not done arguing yet! -harry

Certainly, but the combination of the two doesn't act the same as one of them acting alone, because the two influences have different speeds and directions. If that was true, then a submarine would need to exert a continual torque to prevent itself from "weathervaning" in order to continue...

A ship can certainly weathervane into the wind; in this scenario the water is serving the role of the ground, i.e. providing resistance that prevents the ship from accelerating the craft until its velocity matches the wind's velocity, thus eliminating the relative wind. But in a steady-state...

Which is why I found physics mostly useless in learning to fly, as the flight training world has already constructed a universe of pre-digested physics and mnemonics and short-cut explanations that provide you with the right answer. The advantage of being a physics nerd is mostly that you can...

My experience as a physics/engineering nerd is that in flight training I could never allow myself to know something until I understood the physics behind it. In the end, I doubt that habit had any advantage, it just put up an extra hurdle in the process, but that's just how I'm wired, I'm...

Yeah! Unless they re-collected it from the original sources that CRU collected it from (e.g. national meteorological services), or look at the data that NASA has collected, or look at the CRU data after some processing had taken place, or look at the CRU data beyond the affected era. -harry

http://www.scientificamerican.com/article.cfm?id=graphic-science-radiation-exposure ... Natural background (U.S.) per year: 3.1 ... Airport scanner (backscatter method): 0.0001 ... Dental x-ray: 0.005 Domestic airline flight (five hours): 0.017 Smoking one pack of cigarettes per...

Ok, I thought I'd try that. This is the very real conversation I just had with my "Siri": Me: Call me a taxi Siri: I found 13 cabs ... 12 of them are fairly close to you Me: Call me an ambulance Siri: From now on, I'll call you "an ambulance", OK? Me: Cancel Me: Call me douchebag Siri...

It was described as "ten packages containing five hundred rounds" that was wrapped in "grey tape so that they would not be identifiable to TSA personnel". -harry

We sometimes confuse "it does a thing" with "it does a thing well". -harry