Description: "Autogiro Principle Adapted to Helicopter". Excerpted from the article "HARRY T. NELSON, a war-time aviator now living in Dallas, Texas, has recently developed a helicopter which has proved very successful in the model stage and which he believes to be a solution of the problem of vertical flight. One outstanding feature of the machine is the means of rotating the large horizontal propeller at the top. This is done by the slipstream of the powered propellers situated directly below it and turning in opposite directions. This big propeller, which rotates freely; in much the same manner as the rotor blades of an autogiro..." This is a 1 page magazine article from 1931 Pages measure 6 1/2" x 9". Harry Nelson Autogiro Helicopter concept 1931 graphic pictorial Autogyro Harry Nelson Autogiro Helicopter concept 1931 graphic pictorial Autogyro Click image to enlarge Description "Autogiro Principle Adapted to Helicopter". Excerpted from the article: "HARRY T. NELSON, a war-time aviator now living in Dallas, Texas, has recently developed a helicopter which has proved very successful in the model stage and which he believes to be a solution of the problem of vertical flight. One outstanding feature of the machine is the means of rotating the large horizontal propeller at the top. This is done by the slipstream of the powered propellers situated directly below it and turning in opposite directions. This big propeller, which rotates freely; in much the same manner as the rotor blades of an autogiro..." This is a 1 page magazine article from 1931 Page measures 6 1/2" x 9". Payment Payment: by Paypal, Visa, Mastercard, Discover, American Express, Apple Pay, G Pay, accepted thru eBay. Items shipped upon receipt of payment. Shipping Multiple Items may be grouped to save on shipping. When buying more than one item please use the shopping cart for the best shipping price. Rates: $4.00 for USPS first class / or media mail service $8.70 for priority mail service. $4.00 for Canadian shipping $6.00 other International shipping. About Us Grandpa's Secrets Discover a Wealth of How-to Projects & Plans from a Bygone Era. Explore our Scientific & Mechanical History in Vintage Hobby, Craft, & Technical Magazine Articles. Images sell! Get Supersized Images & Free Image HostingCreate your brand with Auctiva's Customizable Templates. Attention Sellers - Get Templates Image Hosting, Scheduling at Auctiva.com.
Price: 11.89 USD
Location: Diamond Point, New York
End Time: 2025-01-22T14:06:48.000Z
Shipping Cost: 4.5 USD
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Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
