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Dear Dan. THANK YOU for this excellent information. We are still pretty new to this so this helps a lot!

We did some work already and now are noticing also strange behaviour around capitalization, which makes no sense to us at all; any thoughts on that? Here some more details:

I am finding out some interesting things about G search results as I further explore what has happened to my site.

The results are different if you use small case or capital letters such as RC A-10 Warthog or rc a-10 warthog.

The results are different at different times of the day, sometimes within minutes.  Before 7 am today most of the pages which I modified were in the top 10 results, now about 1/2 of them have slipped to page two.

There is absolutely no logic to all the variables.  For example, my site returned to its normal traffic (the same way it was before the algorithm change) of over 5,000 views per day on Saturday and Sunday.  Just last weekend it barely got to 3,000 views.  And, I haven't changed enough pages to the new format to directly affect those results.  I wonder if Google has made an adjustment and that is why many of my pages are getting back to near where they were before?  I look forward to tonight's final numbers for the day to see if it was solely for the weekend or if it continues.

However, using rc a-10 warthog in small letters, the air hogs page is no where to be found, yet my page is no. 4 as of right now. In Caps,  RC A-10 Warthog it is no. 11 right now.

The above example may lead you to believe that the pages on my site should all be in the higher search results when using small case.  However, check out Japanese Zero vs japanese zero.  Just the opposite is true.  In this case my page rates higher when entering it with Capital letters.

Yet, if you look at RC A-6 Intruder vs rc a-6 intruder, they are both around no. 7 in the search results.

Check out how little content is on the page that is higher in the results than mine for the A-6:
http://www.dhgate.com/jet-airplane-a-6-intruder-high-grade-rtf/p-ff80808128ed96260128f2db154e1e9f.html

Check out my A-6 page:
http://www.aviationtrivia.info/Grumman-A-6-Intruder.php

I think it is because DH Gate, like Amazon, simply has thousands of pages and G likes that, even if each page has little content.  Do you concur?

I think what G is doing is known as the google dance.  It is reminiscent of the cypher codes used to encrypt top secret transmissions for the military in that it is constantly changing so as to discourage detection.  What may be a top page one day can rate up to 10 positions lower on another.

Many of my pages have slipped only slightly when G changed their algorithm, such as from no. 1 in the search results to no. 3.  (Virtually all the top rated pages are now ones which have videos.)   However, that has been enough to make a big difference in traffic and sales.

Other than start taking videos of some 500 rc airplanes featured on my site, putting the videos on my site and YouTube, and hoping that the videos will be highly rated, I don't know how to get my pages as high in the search results as the YouTube pages.

The other pages which usually are higher in G's search results are forums like RC Universe and RC Groups.  They have tens of thousands of pages, none of which have been changed, dating back to the late 1990's.  Not much I can do about that either.

My aim is to be in G's search results right after the videos and forums.  I think that someone searching for a rc airplane for sale will go right past them if they know that Aviation Trivia has ALL the rc airplanes of a particular model listed on it on a single page.

The changes I've made, ie. no longer dividing the page between the actual aircraft and rc models of it, has gotten those pages back into the top ten search results, but not for both Caps and small letters.

It was after. The site however has some of the best data from a people perspective. We are trying to reexplain that to the G algo

Thanks you for your thoughts, much appreciated! The Google change is what made use think it is duplication and the only thing we could think of was the repeating specs.

It was copyscape that let us to believe it to be the duplication issue but as we checked on copyscape before the Google change and since tested some content changes that didn't make any difference to copyscape, I am beginning to think that copyscape doesn't work properly.

Now going back to the problem itself, let me describe what we are seeing and maybe you have a better idea what could cause this and what we need to be looking at.

Virtually all of the pages on my Aviation Trivia website www.aviationtrivia.info have been downgraded by Google.  The aircraft pages were mostly in the top ten search results for rc airplanes and the name of the aircraft such as F4U Corsair and the words "for sale", ie:  "F4U Corsair for sale".  A great number of those pages are now out of the first 50 search results.

The aircraft pages all contain original content.  One such page, Sikorsky CH-53
http://www.aviationtrivia.info/Sikorsky-CH-53.php
is typical of the downgraded pages.  It was in the first five page results under its name and now is around no. 60.  The page even has an exclusive interview with a pilot of the aircraft.

A page that was in the top results for the search words "rc Airwolf Helicopter"
http://www.aviationtrivia.info/Airwolf-Helicopter.php has now been downgraded to about no. 30.  The no. 1 search results for rc Airwolf Helicopter is Century Helicopters 30 Size Airwolf Helicopter
http://www.centuryheli.com/products/helikits/cn1070airwolf/index.html?currentid=120
Their page minimally describes three helicopters they sell.  My page at Aviation Trivia describes over 30 Airwolf helicopters for sale plus has information from a person who has flown one, plus additional information on where you can find specifics about the helicopter on popular websites.

The most popular page on my site, World's Fastest Aircraft http://www.aviationtrivia.info/THE-100-FASTEST-AIRCRAFT.php
is still no. 1 in the Google search results, however what was the second most popular page, Largest Aircraft 
http://www.aviationtrivia.info/THE-LARGEST-AIRCRAFT.php
has gone from no. 1 to about no. 50.  What is really interesting is that, although I expect Wikipedia pages to always be above mine in the search results, the highest ranked page after Wikipedia is Global Aircraft - Top 50 Largest Aircraft.
http://www.globalaircraft.org/50_largest.htm

Looking at my page that describes 100 aircraft in detail and provides links to pages in my site that goes into their histories and full specifications, then looking at the Global Aircraft page that simply states the name of the aircraft, wingspan, and weight, I can't understand how it can now ranked no. 1 and my page no. 50 when searching for "world's largest aircraft."

I have set up my site from the view point of a person who is interested in scale rc model aircraft and the aviation history of their actual aircraft.  The information I put on the site is there to not only inform the people about the full scale aircraft, but to give them choices about the rc model airplanes that are available, and other information that may be helpful in choosing the right rc model for them.

Just to clarify, someone would search for rc F4U Corsair, or rc F-14 Tomcat and that would come up in the top search results as well as F4U Corsair for sale and F-14 Tomcat for sale, etc.

Hope that makes sense

Thanks!
Ralf

I am trying to figure our how to correct a recently incurred duplication penalty on a partner site. I didn't see any posts on this yet specific to my problem. The site used to be ranked on page 1 of Google for all important keywords but now we ran into the situation that many pages were bumped to pos 100 or lower due to duplication issues. This is an aviation site, discussing airplanes and each page discusses a different model but each page also has the specs of the plane and while the data parts are different for each plane the specification terms are the same ,see here:

Primary Function:
        Crew:
        Engine:
        Thrust:
        Weight Empty:
        Max. Weight:
        Length:
        Wingspan:
        Cruise Speed:
        Max.Speed:
        Climb:
        Ceiling:
        Range:  
        First Flight:
        Year Deployed:

Is there an easy way to get Google to stop including these terms (not the data in the 2nd column) from the page anaysis to prevent this causing the duplication issues we are are seeing due to this?

Thanks in advance!