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Search: Posts Made By: BRDuBois
Showing results 1 to 35 of 205
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Forum: Accidents and Close Calls
7th Apr 2019, 11:27
Replies: 420
Views: 145,526
Posted By BRDuBois

I've published a new version. This is the first...

I've published a new version. This is the first update in about 3 years, and will probably be my last major update. I've pretty much run out of avenues to research. It's a 77mb PDF, and additions...
Forum: Accidents and Close Calls
2nd Feb 2019, 11:23
Replies: 420
Views: 145,526
Posted By BRDuBois

This is just for fun. Here's what I work on when...

This is just for fun. Here's what I work on when crashing airplanes has me burned out.

https://youtu.be/mhu9fMMvVUw
Forum: Accidents and Close Calls
16th Jan 2019, 02:03
Replies: 420
Views: 145,526
Posted By BRDuBois

Thanks Ed, but it's not really about closure. I...

Thanks Ed, but it's not really about closure. I had that decades ago, or thought I did. It was a total surprise to find the eBay pictures and realize something went wrong in the investigation. At...
Forum: Accidents and Close Calls
28th Dec 2018, 18:38
Replies: 420
Views: 145,526
Posted By BRDuBois

Well this has been an interesting few months. In...

Well this has been an interesting few months. In August I was finishing what I thought would be my last report version, planning to publish in September. To tie up loose ends, I wanted to correlate a...
Forum: Accidents and Close Calls
5th Mar 2018, 14:43
Replies: 420
Views: 145,526
Posted By BRDuBois

I've been working on my next report version, and...

I've been working on my next report version, and want to use my virtual landscape for illustrations. I wasn't satisfied with the level of accuracy in tree placement. I had located trees and shrubs...
Forum: Accidents and Close Calls
15th Feb 2018, 15:25
Replies: 420
Views: 145,526
Posted By BRDuBois

I didn't presume any given speed for knife edge...

I didn't presume any given speed for knife edge flying. If the plane were in stable knife edge flight, we can treat the CG as a point load and the CP as the fulcrum. Since the rudder is the...
Forum: Accidents and Close Calls
12th Feb 2018, 01:03
Replies: 420
Views: 145,526
Posted By BRDuBois

That's a good point. A couple pilots told me...

That's a good point. A couple pilots told me this is not something anyone trains for in airline flying.
Forum: Accidents and Close Calls
11th Feb 2018, 12:23
Replies: 420
Views: 145,526
Posted By BRDuBois

My chapter on flight station resources is an...

My chapter on flight station resources is an attempt to get into their minds. I have yet to get any feedback on it from a pilot. I published it standalone, and it will be in the next release.
...
Forum: Accidents and Close Calls
10th Feb 2018, 22:47
Replies: 420
Views: 145,526
Posted By BRDuBois

Yes, I've been following your ideas with...

Yes, I've been following your ideas with interest.



It goes a long way toward explaining the very low gain in altitude.



From the CAB report: "Actual position of the aileron trim tab...
Forum: Accidents and Close Calls
10th Feb 2018, 15:48
Replies: 420
Views: 145,526
Posted By BRDuBois

To counter the right wing down command, the...

To counter the right wing down command, the rudder needs to move the nose left. In level flight this will roll the sim Electra over.

I've said that the problem was they were already in a bank...
Forum: Accidents and Close Calls
8th Feb 2018, 15:02
Replies: 420
Views: 145,526
Posted By BRDuBois

Bear in mind that other than the aileron trim...

Bear in mind that other than the aileron trim tabs there was no cabling in the wing. The cables ended at the boost unit.
Forum: Accidents and Close Calls
7th Feb 2018, 12:13
Replies: 420
Views: 145,526
Posted By BRDuBois

We don't know what happened to the engines. The...

We don't know what happened to the engines. The ALPA report said engine four separated from the wing at the tracks. It doesn't say where it ended up. The Chicago Tribune said three engines were...
Forum: Accidents and Close Calls
6th Feb 2018, 20:01
Replies: 420
Views: 145,526
Posted By BRDuBois

The graphic labeled "Knife edge flying" was...

The graphic labeled "Knife edge flying" was intended to show the forces involved. It's interesting that it would take about 24,000 lbs of force on the rudder to do this, and I don't seriously...
Forum: Accidents and Close Calls
5th Feb 2018, 18:57
Replies: 420
Views: 145,526
Posted By BRDuBois

I'm working on illustrations for my next...

I'm working on illustrations for my next published version, and just finished a couple examining the CG for the whole plane and for the plane after losing the engines and forward fuselage.

The...
Forum: Accidents and Close Calls
31st Jan 2018, 17:49
Replies: 420
Views: 145,526
Posted By BRDuBois

I've uploaded a video showing how the sim behaves...

I've uploaded a video showing how the sim behaves if the CG is moved five feet forward. It makes a drastic change, and the plane behaves much more as Concours77 was expecting. It is not how N137US...
Forum: Accidents and Close Calls
31st Jan 2018, 01:30
Replies: 420
Views: 145,526
Posted By BRDuBois

I understand your point, but you can throw an...

I understand your point, but you can throw an arrow backward like a dart and it will take eight or ten feet to turn around.
Forum: Accidents and Close Calls
30th Jan 2018, 19:46
Replies: 420
Views: 145,526
Posted By BRDuBois

Here's a stunt plane going backwards. ...

Here's a stunt plane going backwards.

https://youtu.be/KYkGV_SUKdQ
Forum: Accidents and Close Calls
30th Jan 2018, 19:34
Replies: 420
Views: 145,526
Posted By BRDuBois

I sure wouldn't have thought of it if I hadn't...

I sure wouldn't have thought of it if I hadn't seen it in the sim. It's like a hydrofoil flipping over. Once the plane's longitudinal axis was vertical, it's all ballistics and not much in...
Forum: Accidents and Close Calls
30th Jan 2018, 17:13
Replies: 420
Views: 145,526
Posted By BRDuBois

Interesting. Following this page link it's...

Interesting. Following this page link it's marked as removed by the user, but it plays fine. The link without the https is youtu.be/zfBQHyuPXGg Try that.

As a test, I'll create a fresh link on...
Forum: Accidents and Close Calls
29th Jan 2018, 12:09
Replies: 420
Views: 145,526
Posted By BRDuBois

I've uploaded a Youtube video of my...

I've uploaded a Youtube video of my animation of the crash at https://youtu.be/zfBQHyuPXGg.



There are two reasons for doing this. First, the flight sim run, and...
Forum: Accidents and Close Calls
14th Jan 2018, 00:00
Replies: 420
Views: 145,526
Posted By BRDuBois

Their haste may have contributed to the problem. ...

Their haste may have contributed to the problem. If they had to wait a bit for clearance they might have noticed an issue. If already rolling and the issue wasn't waving a red flag in their face,...
Forum: Accidents and Close Calls
13th Jan 2018, 18:22
Replies: 420
Views: 145,526
Posted By BRDuBois

In 1961 the control tower was 100 feet tall. The...

In 1961 the control tower was 100 feet tall. The most respected witnesses would have been the tower staff, and they could use the horizon line to judge the height of the plane. So this is likely to...
Forum: Accidents and Close Calls
13th Jan 2018, 18:06
Replies: 420
Views: 145,526
Posted By BRDuBois

See Megan, that's why your contributions are...

See Megan, that's why your contributions are important to me. When I propose an idea, I can always depend on you coming to the table with the strongest argument you can muster. Apparently that was...
Forum: Accidents and Close Calls
12th Jan 2018, 15:02
Replies: 420
Views: 145,526
Posted By BRDuBois

We went over this in excruciating detail a couple...

We went over this in excruciating detail a couple weeks ago. Wreckage was spread for a length of 1200 feet from the embankment to the final mass. From the 380 foot point the plane slid (per the...
Forum: Accidents and Close Calls
12th Jan 2018, 12:52
Replies: 420
Views: 145,526
Posted By BRDuBois

When it came time to write the final report, the...

When it came time to write the final report, the CAB report author filled in the unimportant parts by checking to see what they'd told the newspapers, and just pasted that in? Sorry, I don't buy it....
Forum: Accidents and Close Calls
11th Jan 2018, 22:54
Replies: 420
Views: 145,526
Posted By BRDuBois

There are several ways the main fuselage could...

There are several ways the main fuselage could have ended in its final position. That's why it's a puzzle. The only thing we can be confident of is that it didn't happen as the CAB report...
Forum: Accidents and Close Calls
11th Jan 2018, 17:58
Replies: 420
Views: 145,526
Posted By BRDuBois

Yeah, the guy it was handed to got real...

Yeah, the guy it was handed to got real interested and gave me some leads to follow while he coordinates field offices to collect data. :)
Forum: Accidents and Close Calls
11th Jan 2018, 13:19
Replies: 420
Views: 145,526
Posted By BRDuBois

Which comes back to the final wreckage being...

Which comes back to the final wreckage being tail-first and inverted, the discomfiting fact that started me on this project. The CAB investigators decided on the day of the crash that the plane slid...
Forum: Accidents and Close Calls
8th Jan 2018, 15:43
Replies: 420
Views: 145,526
Posted By BRDuBois

Looks right, and the text seems to match the...

Looks right, and the text seems to match the hardcopy I scanned for my report. I didn't remember seeing a single-space report, but after I dug through my directories I found the same PDF. Senior...
Forum: Accidents and Close Calls
6th Jan 2018, 15:28
Replies: 420
Views: 145,526
Posted By BRDuBois

Agree. Looking at the flight path came about two...

Agree. Looking at the flight path came about two years after starting the project.



It says Autopilot OFF
Forum: Accidents and Close Calls
6th Jan 2018, 14:43
Replies: 420
Views: 145,526
Posted By BRDuBois

The plane descended on a 5 degree slope over...

The plane descended on a 5 degree slope over several hundred feet. After hitting a 50-ish foot high embankment it stayed in the air another 380 feet. If the bank steadily increased it should have...
Forum: Accidents and Close Calls
5th Jan 2018, 18:05
Replies: 420
Views: 145,526
Posted By BRDuBois

Ah, you're looking at the Cockpit Resources...

Ah, you're looking at the Cockpit Resources chapter that isn't part of the document yet.

Thanks for pointing it out. That was a dumb thing for me to say.
Forum: Accidents and Close Calls
5th Jan 2018, 15:23
Replies: 420
Views: 145,526
Posted By BRDuBois

I discussed some pages back what I call "bevel...

I discussed some pages back what I call "bevel flying", a sort of poor man's knife-edge flying. For any speed below which knife edge flying is possible, there's some maximum bank angle at which the...
Forum: Accidents and Close Calls
5th Jan 2018, 15:02
Replies: 420
Views: 145,526
Posted By BRDuBois

Don't believe I mentioned a voice recorder. What...

Don't believe I mentioned a voice recorder. What page are you speaking of?
Forum: Accidents and Close Calls
3rd Jan 2018, 22:25
Replies: 420
Views: 145,526
Posted By BRDuBois

This is very interesting. I'm buried in learning...

This is very interesting. I'm buried in learning animation tools for the near term, but I'll find what you're talking about in the manuals and see if I can make sense of it. Thanks.
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