{"product_id":"vintage-air-navigation-tools","title":"Vintage Pilot Air Navigation Tools","description":"\u003cp\u003eVintage Felsenthal MB-4 Air Navigation Dead Reckoning Computer with Leather Case\u003c\/p\u003e\n\u003cp\u003eThis item is an authentic Felsenthal Type MB-4 mechanical computer used for air navigation and dead reckoning calculations. It features a circular flight computer (E6B style) for computing wind triangles, time, speed, and distance. The attached slide rule component is used for calculating density altitude and airspeed corrections. It comes in a durable leather pouch for protection and portability. 13.5\" x 6\"\u003c\/p\u003e\n\u003cp\u003eThis manual, analog flight calculator was an essential piece of pre-GPS cockpit gear used by military and civilian pilots to determine critical flight factors like wind correction, true airspeed, fuel consumption, and distance. This complete set includes the dual-sided mechanical computer, a clear plastic navigation alignment slide, and the original brown textured protective case.\u003c\/p\u003e\n\u003cp\u003eThere are handwritten pilot notes that the pilot penciled in shortcut formulas for quick in-flight math calculations to use for time, distance, direction, and course corrections.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003c!--TgQPHd||[]--\u003e\u003c\/p\u003e\n\u003cdiv class=\"Fsg96\"\u003e\u003c!--TgQPHd||[]--\u003e\u003c\/div\u003e\n\u003cp\u003eItem Specifics\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: G. Felsenthal \u0026amp; Sons Inc.\u003c\/li\u003e\n\u003cli\u003eModel: Type MB-4Type: Dead Reckoning Flight Computer \/ Military Navigation Tool\u003c\/li\u003e\n\u003cli\u003eCountry of Manufacture: United States\u003c\/li\u003e\n\u003cli\u003eEra: Vintage (circa 1950s–1970s military\/civilian aviation era)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eKey Features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDual-Sided Design: Features a logarithmic circular slide rule on one face and a polar coordinate wind-drift plotting grid on the reverse.\u003c\/li\u003e\n\u003cli\u003eFormulas Printed on Frame: Includes quick-reference calculation guides for True Heading (TH), True Course (TC), and Magnetic Heading (MH).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is a vintage item that may have imperfections, pencil markings and signs of wear consistent with use and age. \u003c\/p\u003e","brand":"ReStyle \u0026 Co","offers":[{"title":"Default Title","offer_id":45226162585623,"sku":null,"price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2610\/6136\/files\/Vintage_Felsenthal_MB-4_Air_Navigation_Dead_Reckoning_Computer_with_Leather_Case.jpg?v=1781725243","url":"https:\/\/restyleandco.com\/products\/vintage-air-navigation-tools","provider":"ReStyle \u0026 Co","version":"1.0","type":"link"}