Google hates one page, others are OK

I have an aircraft website (wingweb.co.uk) that ranks OK on google for most pages, but one page consistently refuses to rank well. For a long time it languished in the supplemental index, and although it has now entered the main index, it doesn't appear in the first 20 pages of results for a reasonable search term!

Many other pages on the site rank in the top 5 with similar content. My pages are Valid XHTML 1.0 Transitional. What am I doing wrong?

The page that ranks surprisingly poorly as at "wingweb.co.uk/aircraft/The_Avro_Vulcan.html".
Pages that rank OK are at:
"wingweb.co.uk/aircraft/The_Curtiss_C-46_Commando.html" and
"wingweb.co.uk/aircraft/Republic_F-105_Thunderchief.html".

The search terms used in my tests are "vulcan bomber", "c-46 commando" and "republic f-105" respectively, resulting in positions in Google UK (results from UK) of not found,2, and 3.

This has been troubling me for some time, so any ideas would be gratefully recieved

Sorry to inform but your page is still supplementalesque. Just because Google no longer shows it as a Supplemental results there are still some ways to show your pages that are supp -- try running:

site:www.wingweb.co.uk/&

into Google's search bar. Check Page 2 second last entry. There's your page. Run some back links on it to bring it out. Even try linking to the page directly from your home page with some desired anchor text and see if that helps.

Thanks for the quick reply.

I hadn't seen the use of /& on the google search before, and a quick look at advanced search didnt reveal it to me. What does it do?

I understand the backlinks thing, and its something I'm working on. However, many of my pages including the ones mentioned above rank well despite the lack of backlinks, and some pages with (admittedly poor quality) backlinks rank below them.

My question really was are there any "on page" factors such as excessive keyword density that are contributing to the poor rank?

Thanks

You must have noticed that Google has loosen the rule for supplemental results these days. And now your site also don't show any supplemental results in Google.
I think you should be focusing more on the backlinking using the desired keyword as an anchor text in the link. You will surely see the positive effect of this in upcoming weeks. ATB

on the home page make an identical box for the The Avro Vulcan Bomber like you make for so many of your other products.
At the moment you are on page 2 og google for The Avro Vulcan Bomber, I'm sure it will improve.

You know, for a search on The Curtiss C-46 Commando your page The_Curtiss_C-46_Commando.html is on the first google page, now for The Republic F-105 Thunderchief your page Republic_F-105_Thunderchief.html is not on the first page of google.

and this page Republic_F-105_Thunderchief.html and The_Avro_Vulcan.html are very, very big, I've read somewhere that google doesnt read more then 100 k, could this be the problem, cant you break the pages?