ific Challenger">Challenger</a> #3990. 215 <a href="//en.wikipedia.org/wiki/Foot_(unit)" title="Foot (unit)">feet</a> (66 <a href="//en.wikipedia.org/wiki/Metre" title="Metre">m</a>) overall length; 1,457,280 pounds (661,011 kg) total weight. Unsuccessful; set aside in 1964 and scrapped in 1968.</td>
</tr>
<tr>
<td><i><a class="new" href="//en.wikipedia.org/w/index.php?title=H220&amp;action=edit&amp;redlink=1" title="H220 (page does not exist)">H220</a></i></td>
<td><a href="//en.wikipedia.org/wiki/Victor