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Forum: Tech Log
13th Jan 2014, 15:27
Replies: 7
Views: 1,934
Posted By asc12

Because it changed after landing, it sounds more...

Because it changed after landing, it sounds more like a GPS-derived altitude to me, but I've wondered the same thing in the past.
6th Jan 2014, 16:46
Replies: 413
Views: 146,080
Posted By asc12

Back of the envelope, and totally guessing about...

Back of the envelope, and totally guessing about the aircraft's vref:

Vref ~ 120kt
+ 5kt
+ Headwind = 0
+ Half gust component = 6
= approach IAS of 131kt
= approach TAS at 8000ft of 148kt
=...
Forum: Tech Log
19th Apr 2013, 15:41
Replies: 46
Views: 8,589
Posted By asc12

On highly laminar wings this has a major effect,...

On highly laminar wings this has a major effect, actually.

The Piaggio p180 POH contains this text and reduced figures are available for performance calculations:

"This airplane is...
Forum: Tech Log
5th Feb 2013, 19:57
Replies: 9
Views: 1,542
Posted By asc12

I think I'm still confused about the question. ...

I think I'm still confused about the question.

Are you thinking about the induced drag from the blades moving through the air and generating lift along their length?

Both lift and drag will...
Forum: Tech Log
5th Feb 2013, 16:08
Replies: 9
Views: 1,542
Posted By asc12

Another way to think about Mark 1's post is this:...

Another way to think about Mark 1's post is this:

You need to accelerate a mass of air backwards to generate a force to move your engine forwards.

You can accelerate a small amount of air by a...
17th Jan 2013, 19:20
Replies: 2,186
Views: 901,393
Posted By asc12

It has clearly not. If you wrote this post...

It has clearly not.

If you wrote this post from a computer of some sort, you're using technology built largely outside the USA. Just because it was built elsewhere hardly means it was a bad...
17th Jan 2013, 19:12
Replies: 2,186
Views: 901,393
Posted By asc12

It appears both the main and apu batteries are...

It appears both the main and apu batteries are Lithium Manganese.
16th Jan 2013, 01:34
Replies: 265
Views: 93,155
Posted By asc12

Goodness. We're going to need a new forum for...

Goodness. We're going to need a new forum for these threads.

Can anyone tell if the airplanes with battery problems are the same planes, or even the same batteries on different aircraft? A...
26th Dec 2012, 17:15
Replies: 90
Views: 68,421
Posted By asc12

Question The first report did say "landed on a road." I...

The first report did say "landed on a road." I wonder if they mistook highway lights for the runway.
Forum: Tech Log
5th Dec 2012, 15:26
Replies: 49
Views: 12,286
Posted By asc12

Regarding operation pinwheel...

The late Neptunus Lex had a first-hand account from CAPT Gray, the CO of the squadron whose Skyraiders were supposed to help the tugs get Essex in to port at Yokosuka.

The Bridges of Toko-ri ...
Forum: Tech Log
5th Oct 2012, 18:26
Replies: 22
Views: 4,112
Posted By asc12

Flight controls

I was talking this summer to an Osprey pilot, and asked him about the transition from the more vertical flight regime to the more horizontal flight regime.

As was stated above there's a cyclic and...
17th Jul 2012, 20:02
Replies: 22
Views: 8,063
Posted By asc12

The most alarming part of this story is that the...

The most alarming part of this story is that the 757 only had 50 passengers.
24th May 2012, 16:59
Replies: 727
Views: 551,823
Posted By asc12

Winds

It's been said several times on this thread that the weather, day to day, is highly repetitive. Could someone familiar with the area please comment on the (also presumably repetitive) winds to be...
Forum: Tech Log
27th Apr 2012, 18:38
Replies: 2,053
Views: 1,222,088
Posted By asc12

Question Possibly daft question about expansion joints

The exhibit at the Seattle Museum of Flight (Alpha Golf, I think) has the story of the flight engineer who placed his cap in what's called "the expansion joint."

But I can't figure out how the...
6th Apr 2012, 19:02
Replies: 53
Views: 26,352
Posted By asc12

Video removed, it seems.

Video removed, it seems.
Forum: Tech Log
9th Sep 2011, 21:31
Replies: 2,053
Views: 1,222,088
Posted By asc12

My wife thinks I'm a very odd, slightly obsessed,...

My wife thinks I'm a very odd, slightly obsessed, guy who knows too much about airplanes he doesn't fly.

I bet I know more about Concorde than the Cirrus I'm actually able to fly. Don't look at...
Forum: Tech Log
9th Sep 2011, 19:27
Replies: 2,053
Views: 1,222,088
Posted By asc12

Saw BOAG this weekend

I was in Seattle for a wedding this weekend, and got to see BOAG at the Museum of Flight.

It was gratifying, but I can't say she's in stellar condition. I'd give her a solid "B" grade. For one...
Forum: Tech Log
3rd Aug 2011, 21:32
Replies: 1,998
Views: 403,114
Posted By asc12

GPWS works like this, I'd say. "Sink Rate! Sink...

GPWS works like this, I'd say. "Sink Rate! Sink Rate!" and then "Pull up! Pull up!"

You could have Betty give an explicit suggestion (like "Pull up!") for a developed stall: "Nose down!" or...
21st Jul 2011, 21:56
Replies: 109
Views: 76,707
Posted By asc12

...quite a bit. :ooh:

...quite a bit. :ooh:
6th Jul 2011, 17:11
Replies: 120
Views: 50,271
Posted By asc12

It's because the liveATC recordings are very...

It's because the liveATC recordings are very often obtained on scanners. They make an effort, sometimes less successfully than others, to have an appropriate number of frequencies on a "feed," but...
22nd Jun 2011, 20:26
Replies: 120
Views: 50,271
Posted By asc12

LiveATC.net recordings are often confusing, even...

LiveATC.net recordings are often confusing, even when unedited, because the recording device is usually connected to a scanner rather than just a single frequency. The jumping around is tough to...
Forum: Tech Log
23rd Apr 2011, 20:53
Replies: 2,053
Views: 1,222,088
Posted By asc12

No, I probably couldn't. Let me ask it this...

No, I probably couldn't.

Let me ask it this way: Could a student in Aeronautical Engineering calculate the lift and drag for (non-vortex) Concorde using the same equations he would use to...
Forum: Tech Log
22nd Apr 2011, 17:39
Replies: 2,053
Views: 1,222,088
Posted By asc12

Dare I ask for the more complicated version? ...

Dare I ask for the more complicated version?

Sidebar: in a supersonic wind tunnel test, do you get a sonic boom?
Forum: Tech Log
21st Apr 2011, 16:53
Replies: 2,053
Views: 1,222,088
Posted By asc12

Question I hate to go back several pages, but I still have...

I hate to go back several pages, but I still have a basic question about the lift generation when the AoA was more moderate.

When not generating vortex lift, was the airflow attached over both the...
Forum: Tech Log
13th Apr 2011, 19:51
Replies: 3,893
Views: 1,231,438
Posted By asc12

I'm with you in the camp that agrees that the...

I'm with you in the camp that agrees that the poop really left its pile (as you say, "the upset sequence started") at or after 0210. None of the available alternatives make sense-- really, including...
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