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<li>What makes a good paper plane?</li>
</ul>
<h1 id="the-value-of-a-paper-plane">The value of a paper plane</h1>
-<p>A paper plane can model a real plane, with limited resources and with relative ease. Paper has a similar in-scale to weight to strength ratio of aluminium which real planes are made of.</p>
-<p>During the Great Depression, designers used paper models to design planes that were later used very effectively by the Nazis in World War Two.</p>
+<p>A paper plane can model a real plane, with limited resources and with relative ease. Paper has a weight to strength ratio similar to aluminium which real planes are made of.</p>
+<p>During the Great Depression, designers used paper models to help design planes that were later used very effectively by the Nazis in World War Two.</p>
<h1 id="initial-designs">Initial designs</h1>
<p>Try to fold a paper plane and throw it. See who’s can fly well. Think about why certain designs might fly better.</p>
<h1 id="the-classic-design">The classic design</h1>
<figure>
-<img src="https://upload.wikimedia.org/wikipedia/commons/c/c4/Paper_Airplane.png" style="width:50.0%" alt="Classical Plane Design" /><figcaption aria-hidden="true">Classical Plane Design</figcaption>
+<img src="plane.png" style="width:50.0%" alt="Classical Plane Design" /><figcaption aria-hidden="true">Classical Plane Design</figcaption>
</figure>
<h1 id="a-different-design">A different design</h1>
<p>John Collins designed the current world record plane for distance.</p>
-<p>(Optional) See the world record throw: <a href="https://www.youtube.com/watch?v=cXqwUxkNXVE" class="uri">https://www.youtube.com/watch?v=cXqwUxkNXVE</a></p>
+<p>(Optional) Watch the world record throw: <a href="https://www.youtube.com/watch?v=cXqwUxkNXVE" class="uri">https://www.youtube.com/watch?v=cXqwUxkNXVE</a></p>
<p>Folding the record plane(starts itself at 2:50, watch as much as you want) <a href="https://www.youtube.com/watch?v=3BNg4fDJC8A&amp;t=170" class="uri">https://www.youtube.com/watch?v=3BNg4fDJC8A&amp;t=170</a></p>
+<h1 id="extension-more-designs">Extension: more designs</h1>
+<p>Check out <a href="https://www.foldnfly.com" class="uri">https://www.foldnfly.com</a>, the instructions are not perfect but there are quite a few planes.</p>
+<p>The loop plane is pretty good <a href="https://www.foldnfly.com/46.html#Loop-Plane" class="uri">https://www.foldnfly.com/46.html#Loop-Plane</a></p>
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