Courtesy of occasional reader Tuna, the algebraics of an aircraft carrier launch.
33 m/sec2, +3gs, 2.2 secs, for the gouge-meisters out there.
Quibbles: Acceleration is non-linear. Initial velocity is not zero. It feels like more than 3 gs.
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I Was Told That There Would Be No MathBy lex, on September 1st, 2011
28 comments to I Was Told That There Would Be No Math |
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I’m curious what he used for the blackboard software. that’s pretty slick.
The vid is by Khan Academy. Apparently a Camtasia Recorder ($200), SmoothDraw3(Free) and a Wacom Bamboo Tablet ($80) on a PC is used.
Wacom has some interesting HW. Have you seen Inkling? It’s a pen to vector graphics input that ports to Adobe PhotoShop or Illustrator.
Top fuel dragster is @ 4g.
Always thought a carrier launch exceeded that.
Later A-4s were able to take 9Gs down the cat track (A4G ‘not ever tested’ to my knowledge limit on a nil wind, hot tropical day at max. launch weight). Otherwise down the 100 foot (later changed to 110 foot) cat track of HMAS Melbourne the ordinary G force experienced was 5.5 to 6G. A real breath taking punch in the chest – but fun – for less than two seconds.
DONT’ TELL THE CHINESE!
Hunh? Whut? Oh, sorry. I kinda nodded off there. What were ya sayin’?
No kidding…..in the first 30 seconds, this worked as well as two Advil PMs for me.
Now, if we have a detailed description like this of how the curves and lines of a Sport Illustrated Swimsuit model works, I’m there.
Brings back that rattlerattlerattlerattleTHUMPROOOOOAAAAARRRR memory. 01-21-0-L was my rack location. Straight up 10 decks or so over that million watt squeaky door sonar. Between the two its amazing anybody sleeps. But I think I agree with the storekeeper there. Where’s the SI model when you need an interest bearing account to pay attention to?
Seems to have forgotten the carrier is moving too… Not to mention any wind speed the carrier is moving into…
SOP is to turn the carrier into the wind, to maximize initial velocity, right? Land lubber with 3 semesters of undergrad physics here. Pretty much useless.
Actually, it’s designed to minimize the catapult energy transmitted to the aircraft and avoid crosswinds at high gross weights.
What’s the min desired wind speed across the deck for a hornet with:
1) Full tank of gas (internal)
2) Full tank of gas and weapons load
3) Landing
Ballpark is fine
IIRC, it’s in the vicinity of 23, 27 and 17, respectively. But that’s on a hot day (Arabian Gulf hot).
I’m with Lex, feels like more than 3 g’s.
And somehow I’m offended to know I sat in a chair…
I enjoyed his use of the “Programmable Calcultor” software…
is there an app for that?
It actually aggravated me a bit. I was waiting for him to factor the 1000m and the 3600s to 1m and 3.6s and do the math long hand… then pops the calc and I was like WTF! My physics teacher would have docked a point for not factoring everything down.
OT: My daughter needed help with her 6th grade math homework a few years ago and had forgot her calculator at her mom’s. Didn’t understand why I made her do all the math long and show all her work. I kept telling her that when she got to her Physics class she’d have to know how to do it long hand and show work. She just start high school Physics and I have a feeling she’s going to tell me how wrong I was.
33 m/s^2 is about 3.4 Gs in the forward component…. add in the 1G downward component and that gets you up over 3.5 total Gs.
Lex, non-linear acceleration can be good for the aircraft as well as the aviator. EMALS on CVN 78 starts out softer, and accelerates all the way to the end of the stroke, unlike steam cats. So far the live pilots at the LBTS in Lakehurst say they like it. Reportedly takes some getting used to, though.
Navig8r
EMALS maybe nice for the pilots, but I’m not too sure I want to bunk right next to the cat tracks on the O-3 level.
SK1, the guy beats around teh bush quite a bit. He could have said what needed to be said in about 60 seconds (about what I took in lab lectures as a Physics TA). For a guy that doesn’t know much about aviation, he makes a pretty good estimate from decent basic assumptions.
He did state he was making a simplifying assumption about the accel being constant. Those who have made a cat shot know it isn’t constant, and Engineers understand a steam cat won’t provide a constant accel. It’s higher at the start as the pressure is higher, and decreases as the steam expands.
As for the reason for wanting Being an Injuneer I’d say it a bit differently than Lex. I would say it minimizes the energy the cat must supply to the AC to reach the required flying speed. I think that’s what Lex meant as well.
Oops!
First sentence in last paragraph should read “as wanting max wind across the deck, being….” Afterthoughts and all.
Oops!
First sentence in last paragraph should read “as wanting max wind across the deck, being….” Afterthoughts and all.
Sal Khan is teh man.
He forgot to (divide by the (joy level + (the Adrenaline volume * the Mission value)))
Daytime bag-ex the day before pulling into a liberty port pretty much maxes out the joy level imho. Not that they ever did night-time ones.
Don’t forget the “jerk”, that is, the onset rate or derivative of the acceleration.
We’re already into the results of vector Calculus. How much harder do you want it to be? Have some consideration for SK1 and others.
Don’t tease the NTs! Yah, we’re smarter than they are, but they have us outnumbered 99 to 1! And the gurlz prefer them, dammit!