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    <title>Hip Pocket Aeronautics Plans Gallery - Books</title>
    <link>https://hpa.aeromodelling.gr/plans/categories.php?cat_id=139</link>
    <description><![CDATA[]]></description>
    <pubDate>Fri, 03 Jul 2026 05:09:07 GMT</pubDate>
    
    <item>
      <title>Warring, RH Airscrews for Models 1942</title>
      <link>https://hpa.aeromodelling.gr/plans/details.php?image_id=2026</link>
      <pubDate>Sat, 20 Jun 2026 08:11:21 GMT</pubDate>
      <description><![CDATA[Chapter I -Definitions. Blade Element Theory - 5
Chapter II - Momentum Theory. Vortex Theory - 13
Chapter III - Slipstream. Airscrew Interference - 19
Chapter IV - Airscrew Design and Layout - 25
Chapter V - Fixed, Freewheeling and Folding Airscrews - 39
Chapter VI - Variable Pitch Airscrews - 47
Chapter VII - Carving the Airscrew - 55
APPENDICES - 60
,]]></description>
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    <item>
      <title>OG Thetford Camouflage '14-'18 Aircraft</title>
      <link>https://hpa.aeromodelling.gr/plans/details.php?image_id=2022</link>
      <pubDate>Sat, 30 May 2026 09:32:06 GMT</pubDate>
      <description><![CDATA[Contents

Chapter 1 - Introductory - 5
Chapter 2 - British Service Markings - 7
Chapter 3 - German Service Markings - 15
Chapter 4 - French, Italian and American Service Markings - 24
Chapter 5 - The Corps Reconnaissance Squadrons - 29
Chapter 6 - The Camel Squadrons - 35
Chapter 7 - The S.E. 5 Squadrons - 45
Chapter 8 - Other Scout Squadrons - 50
Chapter 9 - &quot;Brisfits&quot; and D.H. Bombers - 57

Note - when there are double spread pages (eg centrefold), the scan includes both a two page version and a two separate page version.]]></description>
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