{"product_id":"direct-lift-aircraft-patent-by-sikorsky-helicopter-ancestor","title":"Direct Lift Aircraft patent by Sikorsky. Helicopter ancestor","description":"\u003cp\u003eDirect Lift Aircraft, U.S. Patent No. 1,994,488 (granted 1935) presents a pioneering rotary-wing aircraft design that laid the groundwork for the modern helicopter. Rendered as detailed black-and-white technical drawings, the patent illustrates a single main lifting rotor combined with a vertical tail rotor to counteract torque. The schematic style emphasizes airflow, mechanical clarity, and balance, capturing the moment when vertical flight shifted from theory to practical engineering. As an artwork, it reflects the elegance of early aeronautical problem-solving through precise industrial linework.\u003c\/p\u003e\n\u003cp\u003eThe inventor, Igor I. Sikorsky, was one of the most influential aviation engineers of the 20th century. Born in Russia and later working in the United States, Sikorsky revolutionized flight by successfully developing the first practical helicopters. His career bridged fixed-wing aircraft and vertical-lift innovation, and his patents remain iconic symbols of technological progress. This work solidified his legacy as the father of the modern helicopter.\u003c\/p\u003e","brand":"Historicalimages","offers":[{"title":"21x29.7 cm \/ 8x12\" \/ On White","offer_id":52833347600721,"sku":"2e11d176-3317-4b8b-a76f-7afab7a557bb","price":23.42,"currency_code":"USD","in_stock":true},{"title":"21x29.7 cm \/ 8x12\" \/ On Cream","offer_id":52833347633489,"sku":"80d59a44-e3ba-4513-a929-d50505f850b0","price":23.42,"currency_code":"USD","in_stock":true},{"title":"21x29.7 cm \/ 8x12\" \/ On Black","offer_id":52833347666257,"sku":"293f7aa7-28bb-474e-b935-2f25e5ca4d94","price":23.42,"currency_code":"USD","in_stock":true},{"title":"21x29.7 cm \/ 8x12\" \/ Blue Print","offer_id":52833347699025,"sku":"0e0d4240-f651-46aa-85e6-8f5cd9cd01d1","price":23.42,"currency_code":"USD","in_stock":true},{"title":"21x29.7 cm \/ 8x12\" \/ Vintage","offer_id":52833347731793,"sku":"cdb2f3dc-e63c-494b-9da9-e91146a00f8d","price":23.42,"currency_code":"USD","in_stock":true},{"title":"21x29.7 cm \/ 8x12\" \/ On Blackboard","offer_id":52833347764561,"sku":"f75f2f59-5f8d-49c8-b369-e49212a2c757","price":23.42,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ On White","offer_id":52833347797329,"sku":"71d92c1f-2ee9-486f-a927-0a23cb8b24c6","price":47.1,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ On Cream","offer_id":52833347830097,"sku":"3b32e7f1-cf2a-4700-bb06-24e3291bd110","price":47.1,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ On Black","offer_id":52833347862865,"sku":"925f6a43-4cf6-4a42-bdb7-9c9098e4bc90","price":47.1,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ Blue Print","offer_id":52833347895633,"sku":"37332dde-9bc3-414b-8f12-c33da9443221","price":47.1,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ Vintage","offer_id":52833347928401,"sku":"3d588e79-3e5b-4b6e-a72b-8de7f358b583","price":47.1,"currency_code":"USD","in_stock":true},{"title":"A3 (29.7 x 42  cm) \/ On Blackboard","offer_id":52833347961169,"sku":"c6c719d2-5b00-465f-b1c2-02bd5a16af1a","price":47.1,"currency_code":"USD","in_stock":true},{"title":"30x45 cm \/ 12x18″ \/ On White","offer_id":53714829181265,"sku":"62132204-6b55-4a74-947a-0a9a3e23ae27","price":55.7,"currency_code":"USD","in_stock":false},{"title":"30x45 cm \/ 12x18″ \/ On Cream","offer_id":53714829214033,"sku":"da5e63a4-db08-45ed-bd8d-69b8171664f2","price":55.7,"currency_code":"USD","in_stock":false},{"title":"30x45 cm \/ 12x18″ \/ On Black","offer_id":53714829246801,"sku":"1737a18c-6625-4cf1-88eb-e59693c12a13","price":55.7,"currency_code":"USD","in_stock":false},{"title":"30x45 cm \/ 12x18″ \/ Blue Print","offer_id":53714829279569,"sku":"62132f09-78ea-4234-8d03-ab8c114751a8","price":55.7,"currency_code":"USD","in_stock":false},{"title":"30x45 cm \/ 12x18″ \/ Vintage","offer_id":53714829312337,"sku":"4052520d-69c5-4d94-a48c-7783cc9ca707","price":55.7,"currency_code":"USD","in_stock":false},{"title":"30x45 cm \/ 12x18″ \/ On Blackboard","offer_id":53714829345105,"sku":"69162a90-ab06-4ef2-a54e-b7bf58a0bb96","price":55.7,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ On White","offer_id":53714829377873,"sku":"38057e39-6c22-4777-b96c-e0fe14384a42","price":59.62,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ On Cream","offer_id":53714829410641,"sku":"1fc74e60-2e21-4b23-b49f-90da3daefbe2","price":59.62,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ On Black","offer_id":53714829443409,"sku":"45ba3d1c-de19-47fc-a3a1-fb3fbcbb137a","price":59.62,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ Blue Print","offer_id":53714829476177,"sku":"ae88e5de-4863-4084-bb97-910a2b976bb8","price":59.62,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ Vintage","offer_id":53714829508945,"sku":"8e30f229-e720-4b9a-be21-0e5d40624d2d","price":59.62,"currency_code":"USD","in_stock":false},{"title":"40x60 cm \/ 16x24″ \/ On Blackboard","offer_id":53714829541713,"sku":"2b429b66-c6ee-423d-9ec4-43c41b940c8f","price":59.62,"currency_code":"USD","in_stock":false},{"title":"A2 (42 x 59.4  cm) \/ On White","offer_id":52833348387153,"sku":"d55d1f9b-c14a-41be-9753-de2227cda343","price":51.82,"currency_code":"USD","in_stock":true},{"title":"A2 (42 x 59.4  cm) \/ On Cream","offer_id":52833348419921,"sku":"e3b329ff-9723-49e9-9717-427984fe03ba","price":51.82,"currency_code":"USD","in_stock":true},{"title":"A2 (42 x 59.4  cm) \/ On Black","offer_id":52833348452689,"sku":"4adb6800-aecc-47d2-80ad-d78da6e9636f","price":51.82,"currency_code":"USD","in_stock":true},{"title":"A2 (42 x 59.4  cm) \/ Blue Print","offer_id":52833348485457,"sku":"1d6568e0-0bf2-4b4f-be89-9158f372d1e9","price":51.82,"currency_code":"USD","in_stock":true},{"title":"A2 (42 x 59.4  cm) \/ Vintage","offer_id":52833348518225,"sku":"2bbd322e-961a-4b02-98fe-c8e18e29fbf4","price":51.82,"currency_code":"USD","in_stock":true},{"title":"A2 (42 x 59.4  cm) \/ On Blackboard","offer_id":52833348550993,"sku":"12ffdcce-1fc2-4031-b602-371db06fd673","price":51.82,"currency_code":"USD","in_stock":true},{"title":"45x60 cm \/ 18x24″ \/ On White","offer_id":53714829574481,"sku":"d27ab7c9-5d9a-4c7c-8654-1a8c4b17bb7c","price":62.17,"currency_code":"USD","in_stock":false},{"title":"45x60 cm \/ 18x24″ \/ On Cream","offer_id":53714829607249,"sku":"55205866-d167-465f-8ea5-452f0ff19637","price":62.17,"currency_code":"USD","in_stock":false},{"title":"45x60 cm \/ 18x24″ \/ On Black","offer_id":53714829640017,"sku":"4b2a1b2e-dcb8-4042-ac3c-1800d26bca71","price":62.17,"currency_code":"USD","in_stock":false},{"title":"45x60 cm \/ 18x24″ \/ Blue Print","offer_id":53714829672785,"sku":"d7e083cc-c764-44ef-9c16-53e7fe47f44b","price":62.17,"currency_code":"USD","in_stock":false},{"title":"45x60 cm \/ 18x24″ \/ Vintage","offer_id":53714829705553,"sku":"76793948-8c92-47e3-8b19-3d1f7ad7038f","price":62.17,"currency_code":"USD","in_stock":false},{"title":"45x60 cm \/ 18x24″ \/ On Blackboard","offer_id":53714829738321,"sku":"b3585fdf-eca1-4181-aee7-95e238677800","price":62.17,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ On White","offer_id":53714829771089,"sku":"47b9ba02-4c35-4d65-b0b4-2eb748497921","price":63.05,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ On Cream","offer_id":53714829803857,"sku":"cf40dec1-0cb7-4709-857c-505d2b7922bd","price":63.05,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ On Black","offer_id":53714829836625,"sku":"e21a1263-485a-417c-b36d-cda87c15a984","price":63.05,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ Blue Print","offer_id":53714829869393,"sku":"b1888ec1-fd1f-4504-aa43-b6dc32c40876","price":63.05,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ Vintage","offer_id":53714829902161,"sku":"e1432071-4a74-4c2e-bcb5-90cc86dae7be","price":63.05,"currency_code":"USD","in_stock":false},{"title":"50x70 cm \/ 20x28″ \/ On Blackboard","offer_id":53714829934929,"sku":"a8df2812-efca-43e9-9dfb-6872bef04acc","price":63.05,"currency_code":"USD","in_stock":false},{"title":"A1 (59.4 x 84.1  cm) \/ On White","offer_id":52833348976977,"sku":"6a98de17-be92-415a-be78-3bfb818f33d7","price":59.54,"currency_code":"USD","in_stock":true},{"title":"A1 (59.4 x 84.1  cm) \/ On Cream","offer_id":52833349009745,"sku":"5877832c-4f5d-45ef-aad7-3b171f8ea585","price":59.54,"currency_code":"USD","in_stock":true},{"title":"A1 (59.4 x 84.1  cm) \/ On Black","offer_id":52833349042513,"sku":"fbd66162-6326-42e4-ab91-440276c30d50","price":59.54,"currency_code":"USD","in_stock":true},{"title":"A1 (59.4 x 84.1  cm) \/ Blue Print","offer_id":52833349075281,"sku":"f128c9a3-3015-427c-b4de-7eaad3f0eea9","price":59.54,"currency_code":"USD","in_stock":true},{"title":"A1 (59.4 x 84.1  cm) \/ Vintage","offer_id":52833349108049,"sku":"29c9126d-16e3-4508-917f-443e120e7a5c","price":59.54,"currency_code":"USD","in_stock":true},{"title":"A1 (59.4 x 84.1  cm) \/ On Blackboard","offer_id":52833349140817,"sku":"5a347e1f-c9dc-4405-b19e-b5700089dede","price":59.54,"currency_code":"USD","in_stock":true},{"title":"60x80 cm \/ 24x32″ \/ On White","offer_id":53714829967697,"sku":"44ea56cc-be4e-4f37-952d-0209d6b93a23","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x80 cm \/ 24x32″ \/ On Cream","offer_id":53714830000465,"sku":"c3e33604-5e7d-49c5-8959-8908bcbccb6e","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x80 cm \/ 24x32″ \/ On Black","offer_id":53714830033233,"sku":"da9265da-1ee6-4688-bda0-2a378a32d8b1","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x80 cm \/ 24x32″ \/ Blue Print","offer_id":53714830066001,"sku":"a16cb5bd-7e06-4903-9c9c-58c8014252e8","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x80 cm \/ 24x32″ \/ Vintage","offer_id":53714830098769,"sku":"b5b245dd-1413-47c7-b148-f2a0dd66fcb4","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x80 cm \/ 24x32″ \/ On Blackboard","offer_id":53714830131537,"sku":"c1a37baa-39c6-4d13-b0d6-0a094c7c2504","price":67.62,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ On White","offer_id":53714830164305,"sku":"558f544d-4ecd-4c2a-b8b1-d4a2d2de05fc","price":70.44,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ On Cream","offer_id":53714830197073,"sku":"4470efd1-b0ea-4682-a082-7bbdc2b2c19e","price":70.44,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ On Black","offer_id":53714830229841,"sku":"93785519-1331-4569-b3d9-341ba9067d63","price":70.44,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ Blue Print","offer_id":53714830262609,"sku":"2d9ff861-d402-45da-b0f6-d0e13bd6bd94","price":70.44,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ Vintage","offer_id":53714830295377,"sku":"304f9141-9ec5-4a60-9789-500330436aba","price":70.44,"currency_code":"USD","in_stock":false},{"title":"60x90 cm \/ 24x36″ \/ On Blackboard","offer_id":53714830328145,"sku":"047539a3-a3ac-4304-b268-0002426ee4e7","price":70.44,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ On White","offer_id":53714830360913,"sku":"b444b14c-4166-454b-b6c7-df4fe2d17854","price":71.4,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ On Cream","offer_id":53714830393681,"sku":"de20f0b2-d2e2-44ae-9417-7d87e6861cfa","price":71.4,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ On Black","offer_id":53714830426449,"sku":"37fbc7d9-5a32-4b41-9fb1-886054dbd208","price":71.4,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ Blue Print","offer_id":53714830459217,"sku":"c118a90a-440a-4a97-853c-489079b80dbd","price":71.4,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ Vintage","offer_id":53714830491985,"sku":"83e164ec-924d-4882-bbaa-8c053f60b48b","price":71.4,"currency_code":"USD","in_stock":false},{"title":"70x100 cm \/ 28x40″ \/ On Blackboard","offer_id":53714830524753,"sku":"ec9a4ca1-7adf-4758-bb23-f8f600ef0925","price":71.4,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ On White","offer_id":53714830557521,"sku":"8cd43f6e-02ef-4fdc-9f7c-a7f5e310d7d1","price":72.41,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ On Cream","offer_id":53714830590289,"sku":"3c85469e-21c8-436f-9f98-0e3fc54aa209","price":72.41,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ On Black","offer_id":53714830623057,"sku":"74ab4bb4-8eb7-48b0-929f-95d9a363ba9c","price":72.41,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ Blue Print","offer_id":53714830655825,"sku":"fa18b514-9c80-45e5-9bd8-7dc541874f80","price":72.41,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ Vintage","offer_id":53714830688593,"sku":"a1e2ceea-09f3-4808-8b0b-bee29cc23356","price":72.41,"currency_code":"USD","in_stock":false},{"title":"75x100 cm \/ 30x40″ \/ On Blackboard","offer_id":53714830721361,"sku":"45c4fcf3-45f0-4182-a493-8ffa2efed74e","price":72.41,"currency_code":"USD","in_stock":false},{"title":"A0 (84.1 x 118.9  cm) \/ On White","offer_id":52833349960017,"sku":"e7ffc268-854b-4f0f-aebc-b11c5a9620fb","price":64.03,"currency_code":"USD","in_stock":true},{"title":"A0 (84.1 x 118.9  cm) \/ On Cream","offer_id":52833349992785,"sku":"29f78c32-4811-4b69-b495-4c495ba2abd2","price":64.03,"currency_code":"USD","in_stock":true},{"title":"A0 (84.1 x 118.9  cm) \/ On Black","offer_id":52833350025553,"sku":"bf23a093-e2a8-42cf-94db-3cb480e2f5ed","price":64.03,"currency_code":"USD","in_stock":true},{"title":"A0 (84.1 x 118.9  cm) \/ Blue Print","offer_id":52833350058321,"sku":"e1aa553a-48bb-4974-8ba0-a6736487ea8b","price":64.03,"currency_code":"USD","in_stock":true},{"title":"A0 (84.1 x 118.9  cm) \/ Vintage","offer_id":52833350091089,"sku":"88440fc3-141d-4409-a184-ec092535ebce","price":64.03,"currency_code":"USD","in_stock":true},{"title":"A0 (84.1 x 118.9  cm) \/ On Blackboard","offer_id":52833350123857,"sku":"3eb42ba4-0668-46ba-9f3f-6df491a708e5","price":64.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/4048\/9809\/files\/ec26baab-377b-48bd-9e96-920cca68250a_02e258f9-dc98-4f7b-9430-d3c4c7d3b21c.jpg?v=1778894467","url":"https:\/\/historicalimages.com\/products\/direct-lift-aircraft-patent-by-sikorsky-helicopter-ancestor","provider":"Historicalimages","version":"1.0","type":"link"}