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Basing a parachute is entirely different from a card weighing less than an ounce. then you base the card from controlled testing. cards, plates, different size objects will behave differently. I'm now questioning the thickness of the placard. the card is not easily found either. Hominid might be right that it was exclusive to NWO.

My other concern is the tears and cuts in the card itself and how that would react vs a perfect 6x6 or 5x5 card. will it tumble in the condition it was in. you can't say one way or the other without some sort of testing or seeing the actual card itself.

Late for work...will continue later today..

Parachutes did not have anything to do directly with this analysis.  The 2011 analysis lists a source for the characteristics of tumbling plates as they fall.  That data has been used in all of these analyses.

Is there a reference to this  tumbling plates  analysis?

What does  'tumbling plate' mean? I have a feeling lots of variables are being fudged!

For the 2011 and subsequent analyses, the drag coefficient for the placard was estimated to be 1.0 based on information in Sandia Laboratories Report SC-RR-68-132, August 1968, title: Free-Fall Rotation and Aerodynamic Motion of Rectangular Plates.  The major points in the report are that all of their rectangular plates, which were made of wood, started to rotate about one or more axes after falling a relative short distance and that the drag coefficient was always in the vicinity of 1.0 regardless of how the plates tumbled.  I printed a copy of this report in 2011.

There used to be a direct link to the above report, but it can now apparently still be accessed by Googling the report and following some links.  The above report is apparently the same one that Georger is referring to at the bottom of his post number 1770 on this thread.  Georger gives a link so it can probably be accessed through that link also.

Any "fudging" involved ignoring wind speeds that appeared to be excessively high and were reduced to more realistic values using a number of other sources as guidelines.  Apparently, some of the radiosonde equipment malfunctioned as mentioned in my most recent analyses.  Reducing these wind speeds to lower values prevented the estimated separation point for the placard being further WEST.

If you think there was any "fudging" to support a western flight path then make your case and show your work.  And you had damn well better be ready to defend your allegations.

Robert99   

Correct, the problem is the plates are 50 times the size of the placard and weigh over 40 pounds? to me, it's like taking a Corvette and racing a VW. no contest... the data should be in the ballpark of the item in question. I believe you have some data that matches the card or similar. that's what should be presented IMO.

It was basically a quick test to see what the card would do. a first step. next will be a card damaged like the one found. I did a quick test of that the other day and it reacted differently. these are things that could end up helping. it's part of testing a theory. the card didn't like strong winds. I can say that. I didn't do any video on the second round because it wasn't very high. only about 20 plus feet.
 
video below is from 40 feet..

I believe the plates were metal. they are heavy coming in at over 40 lbs. they show the plates rotating, as in rocking back and fourth and then turning sideways. they show terminal up to 104 feet per second. they dropped them from different positions. I see mentions of spiraling as well. I just don't see the similarities?

48" x 18" .50 thick. 44 +- 1/4 lbs.

They remained in a flat position for 50 to 90 seconds before autorotational mode took place..

I don't know where you obtained the above information but it definitely did not come from the Sandia Report.  Those plates were wood and did not weigh anywhere close to 44 pounds nor did they reach a speed of 104 feet per second which is more than 60 nautical miles per hour.

And all of them started rotating shortly after being dropped.  Even a metal plate would start rotating soon after being dropped.

Yes, it has the same number SC-RR-68-132
August 1968

Rectangular plates...wood is never referred to as plates.

One of the plates dropped. not the size with the car in the background...other photo;s show what happened to the plates on impact..some bowed, others bent on corners etc.

I don't believe the report references any particular material. However, when describing the damage that some of the plates endured they use the words "bowed" and "splintered."