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    <title>Hip Pocket Aeronautics Plans Gallery - Warring, RH Airscrews for Models 1942</title>
    <link>https://hpa.aeromodelling.gr/plans/details.php?image_id=2026</link>
    <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>
    <pubDate>Fri, 03 Jul 2026 06:00:43 GMT</pubDate>
      <image>
      <url>https://hpa.aeromodelling.gr/plans/data/thumbnails/139/warring_airscrews_for_models_1942.jpg</url>
      <title>Warring, RH Airscrews for Models 1942</title>
      <link>https://hpa.aeromodelling.gr/plans/details.php?image_id=2026</link>
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