Author Topic: Flight Path And Related Issues  (Read 331217 times)

Offline Shutter

  • Administrator
  • Hero Member
  • *****
  • Posts: 9205
  • Thanked: 969 times
Re: Flight Path And Related Issues
« Reply #4440 on: November 03, 2021, 08:22:57 PM »
Interesting video from Antarctica, a woman opens a door with 60+  mph winds.

.
 

Offline 377

  • Hero Member
  • *****
  • Posts: 1568
  • Thanked: 421 times
Re: Flight Path And Related Issues
« Reply #4441 on: November 04, 2021, 01:13:06 AM »
I jumped off the rear ramp of a C 130 that was flying WOT. I estimate the airspeed was around 350 mph. It was a test jump for a company that makes automatic openers for reserves, called AADs. I was outfitted with pressure sensors all over my exterior and a data recorder. They wanted to see how pressure fluctuated on a tumbling skydiver. Their AADs trigger on sensed pressure which is inversely proportional to altitude. High pressure indicates low altitude.

The exit was REALLY VIOLENT. I was wildly tumbling completely unable to stabilize. The angular rate of my tumbling was very high. Everything was a blur. I worried about my canopy accidentally deploying and the rapid deceleration dissecting a coronary artery. That has happened to some early head down freefallers whose rigs vibrated/fluttered  open. My rig was designed for high speed freefall but I still worried. As I decelerated to freefall velocity I was able to stabilize and deploy my main canopy normally.

The company that paid for my test jump was very pleased with the data that was recorded from my wild ride. Turns out that there were large differences recorded simultaneously between pressure sensors mounted on different parts of my tumbling body.

Really high exit speed causes freefall chaos. At least it did with me. It’s odd to think about slowing down in freefall.

377

 
The following users thanked this post: andrade1812, dudeman17

Offline dudeman17

  • Full Member
  • ***
  • Posts: 248
  • Thanked: 76 times
Re: Flight Path And Related Issues
« Reply #4442 on: November 04, 2021, 05:26:33 PM »
Geez, how did you get suckered into that, haha?
 

Offline 377

  • Hero Member
  • *****
  • Posts: 1568
  • Thanked: 421 times
Re: Flight Path And Related Issues
« Reply #4443 on: November 05, 2021, 04:15:13 AM »
You called it right Dudeman. I found out later that they had asked many other jumpers all of whom declined. The “pay” was a free C 130 jump and a tshirt. I initially felt like a heroic test pilot specially selected for his courage and skills. That morphed into sucker pretty quickly.

377
« Last Edit: November 05, 2021, 05:57:10 AM by 377 »
 
The following users thanked this post: andrade1812

Offline 377

  • Hero Member
  • *****
  • Posts: 1568
  • Thanked: 421 times
Re: Flight Path And Related Issues
« Reply #4444 on: November 12, 2021, 10:35:02 PM »
Can airliner flight paths be reconstructed after the fact? It appears that some can. This wouldn’t help with 305 because the system used to map ionospheric reflections using the Internet and HF ham radio signals wasn’t available in 1971.

This is truly fascinating. You are not allowed to view links. Register or Login

I want to hear from Snowmman, Georger, Tom Kaye and other scientifically inclined Vortex dwellers. What do you think of this technique?

377
 

Offline georger

  • Hero Member
  • *****
  • Posts: 3066
  • Thanked: 440 times
Re: Flight Path And Related Issues
« Reply #4445 on: November 12, 2021, 11:34:26 PM »
You are not allowed to view links. Register or Login
Can airliner flight paths be reconstructed after the fact? It appears that some can. This wouldn’t help with 305 because the system used to map ionospheric reflections using the Internet and HF ham radio signals wasn’t available in 1971.

This is truly fascinating. You are not allowed to view links. Register or Login

I want to hear from Snowmman, Georger, Tom Kaye and other scientifically inclined Vortex dwellers. What do you think of this technique?

377

Very interesting and definitely has merit. If  you know K6MYC (Mike Stahl at M2 Res./Antennas) you should run this by Mike  ;)). Mike would be interested in this - its right down his alley. Mike ran a few studies related to this for NASA and JPL when he was working with Stanford back in the 70s? Glad you brought this to our attention. Could this technique be used to check the fp of 305 ... my thought is its too old, but its worth a discussion. What are the inherent limitations of this process?

Im glad they are still looking for MH370.   

Good post! 

BTW you can still find Mike on 40m ~7150 working the South Pacific almost every night around 0600 UTC when there is propagation ...   Mike is now 84 and still going strong. He is nothing short of amazing! The same old Mike we always knew!!    :chr2:
« Last Edit: November 13, 2021, 12:04:05 AM by georger »
 

Offline Robert99

  • Hero Member
  • *****
  • Posts: 1508
  • Thanked: 170 times
Re: Flight Path And Related Issues
« Reply #4446 on: November 13, 2021, 12:55:29 AM »
You are not allowed to view links. Register or Login
Can airliner flight paths be reconstructed after the fact? It appears that some can. This wouldn’t help with 305 because the system used to map ionospheric reflections using the Internet and HF ham radio signals wasn’t available in 1971.

This is truly fascinating. You are not allowed to view links. Register or Login

I want to hear from Snowmman, Georger, Tom Kaye and other scientifically inclined Vortex dwellers. What do you think of this technique?

377

This is nonsense.  The probability of little green men from Mars hijacking the MH370 airliner is greater than the probability that this fellow can reconstruct its flight path several years after the fact. ::) 
 

Offline georger

  • Hero Member
  • *****
  • Posts: 3066
  • Thanked: 440 times
Re: Flight Path And Related Issues
« Reply #4447 on: November 13, 2021, 03:20:11 AM »
You are not allowed to view links. Register or Login
You are not allowed to view links. Register or Login
Can airliner flight paths be reconstructed after the fact? It appears that some can. This wouldn’t help with 305 because the system used to map ionospheric reflections using the Internet and HF ham radio signals wasn’t available in 1971.

This is truly fascinating. You are not allowed to view links. Register or Login

I want to hear from Snowmman, Georger, Tom Kaye and other scientifically inclined Vortex dwellers. What do you think of this technique?

377

This is nonsense.  The probability of little green men from Mars hijacking the MH370 airliner is greater than the probability that this fellow can reconstruct its flight path several years after the fact. ::)

Well of course, ... what else ! Have you reviewed the theory? You are not allowed to view links. Register or Login

Never mind. Go back to sleep. All is well.   

I dont see YOU doing anything! So what's your beef with people who are trying to help ....
« Last Edit: November 13, 2021, 04:15:25 AM by georger »
 

Offline georger

  • Hero Member
  • *****
  • Posts: 3066
  • Thanked: 440 times
Re: Flight Path And Related Issues
« Reply #4448 on: November 13, 2021, 03:56:38 AM »
The WSPR Protocol:   You are not allowed to view links. Register or Login)

Applications
Raspberry Pi as WSPR transmitter

The protocol was designed to test propagation paths on the LF, MF and HF bands. Also used experimentally at VHF and higher frequencies. Other applications include antenna testing, frequency stability and frequency accuracy checking. Usually a WSPR station contains a computer and a transceiver, but it is also possible to build very simple beacon transmitters with little effort. For example a simple WSPR beacon can be built using the Si 570,[5] or Si 5351.[6] The Raspberry Pi can also be used as WSPR beacon. Density distribution of WSPR spots, January 2014 vs July 2014, using only most distant reception per spot.

Note - an accurate clock is essential both for transmission, and decoding of received signals (native Windows timing is usually inadequate).

MH370
In May 2021, aerospace engineer Richard Godfrey suggested an examination of historical WSPR data to further define the flight path of Malaysian Airlines flight MH370 on 8 March 2014, suggesting that there were "518 unique transmission paths that cross the area of interest around Malaysia, the Malacca Strait and the Indian Ocean. With the WSPR data provided every two minutes and the ability to check against the satellite data every hour it is possible to detect and track MH370 from two independent sources."[7]

However, the method used in this article is highly questionable; The reflected signal energy from aircraft in such distances is very small (inverse square law), much smaller than variance on the regular skywave signal due to multipath propagation, which can vary by tens of dB within seconds. Such difficulties make it necessary to use more advanced methods for radar applications at such distances in this frequency range (Over-the-horizon radar). But, the theory is sound. Better data may provide new insights especially if it agrees with prior techniques utilized which have already defined a general search area. 
 

Online snowmman

  • Hero Member
  • *****
  • Posts: 1716
  • Thanked: 154 times
Re: Flight Path And Related Issues
« Reply #4449 on: November 13, 2021, 04:55:31 PM »
You are not allowed to view links. Register or Login
Can airliner flight paths be reconstructed after the fact? It appears that some can. This wouldn’t help with 305 because the system used to map ionospheric reflections using the Internet and HF ham radio signals wasn’t available in 1971.

This is truly fascinating. You are not allowed to view links. Register or Login

I want to hear from Snowmman, Georger, Tom Kaye and other scientifically inclined Vortex dwellers. What do you think of this technique?

377

interesting. from that link. Proplab pro You are not allowed to view links. Register or Login

here's a review of various radio prop programs. Proplab Pro is available since 2007. 4 stars You are not allowed to view links. Register or Login



“I use Proplab Pro V3.1 for tracing radio waves around the globe. Proplab Pro was one of the first ionospheric physics-based HF radio signal ray-tracing engines in the world for the PC and has been maintained and developed for over 30 years. It continues to be used by research organisations, scientists, engineers, students, the military and amateur radio operators around the world. It is one of the only software packages to reliably predict ionospherically refracted HF radio signal behaviour. It uses both three-dimensional models of the ionosphere as well as three-dimensional topographical data of the Earth to provide unprecedented detail in modelling HF radio signal propagation worldwide.

GDTAAA is a software application that I have developed that uses a Vincenty WGS84 navigation engine to track aircraft, a spherical navigation engine to track WSPRnet data links and anomalies. In addition, I use the Proplab Pro V3.1 engine with its embedded IRI 2007 ionospheric model to perform global ionospheric mapping and ray tracing.”
 
The following users thanked this post: 377, georger