<\/p>\nAnother quick update on my model of Leonardo’s helicopter – I have made a larger diameter rotor and achieved a couple of flights across the room. The rotor diameter is now about 18cms (about 7.5 inches) and made from cereal box card. The helix winds one and a half times around (one circle plus a half, with the lower circle split along the radius to the centre and the extra half attached with masking tape. There was some sag, which I rectified with a masking tape brace – you will notice that Leonardo’s helicopter design had string braces to support the rotor structure – I guess he had problems with sag too \ud83d\ude09 Anyhow here is a picture of my model (current configuration as flown). The drive is the same spinning-top launcher that I was using before.<\/p>\n
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And Leonardo’s one for comparison:<\/p>\n
![](\"http:\/\/www.leonet.it\/comuni\/vincimus\/_im_musv\/09elicot.jpg\"\/)
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Image as displayed on the Leonardo Museum in Vinci<\/a> – they also have a model based on Leonardo’s helicopter<\/a>, but using fabric rotors the way Leonard’s original envisaged. <\/p>\n Cheers Another quick update on my model of Leonardo’s helicopter – I have made a larger diameter rotor and achieved a couple of flights across the room. The rotor diameter is now about 18cms (about 7.5 inches) and made from cereal box card. The helix winds one and a half times around (one circle plus a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,2,8],"tags":[],"class_list":["post-78","post","type-post","status-publish","format-standard","hentry","category-history","category-journal","category-technology"],"_links":{"self":[{"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/78"}],"collection":[{"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=78"}],"version-history":[{"count":0,"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/78\/revisions"}],"wp:attachment":[{"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=78"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=78"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lostbiro.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Jerry <\/p>\n","protected":false},"excerpt":{"rendered":"