US2011314673A1PendingUtilityA1

Rotor Blade of Model Rotorcraft, and Method of Manufacturing Rotor Blade

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Assignee: YAMADA MASAAKIPriority: Mar 2, 2009Filed: Feb 26, 2010Published: Dec 29, 2011
Est. expiryMar 2, 2029(~2.6 yrs left)· nominal 20-yr term from priority
Inventors:Masaaki Yamada
A63H 27/12Y10T29/49332
48
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Claims

Abstract

A rotor blade is constituted by roll-forming, in which, while feeding an elongated cylindrical aluminum alloy tubing having desired dimensions by means of a feeder that feeds the aluminum alloy tubing, pressure is applied to the aluminum alloy tubing from opposed two directions. More specifically, the rotor blade is constituted by roll-forming the aluminum alloy tubing such that a cross-section thereof viewed from one longitudinal end thereof has an airfoil section shape and an integral hollow structure is formed inside the aluminum alloy tubing.

Claims

exact text as granted — not AI-modified
1 - 3 . (canceled) 
     
     
         4 . A method of manufacturing a rotor blade of a model rotorcraft, the method comprising:
 a step of roll-forming an elongated cylindrical aluminum alloy tubing having desired dimensions such that a cross-section of the aluminum alloy tubing viewed from one longitudinal end thereof has an airfoil section shape and an integral hollow structure is formed inside the aluminum alloy tubing, the step including:
 a step of feeding the aluminum alloy tubing by means of a feeder that feeds the aluminum alloy tubing, and 
 a step of applying pressure to the aluminum alloy tubing from opposed two directions. 
   
     
     
         5 . A method of manufacturing a rotor blade of a model rotorcraft, the method comprising:
 a step of press-forming an elongated cylindrical aluminum alloy tubing having desired dimensions with a mold such that a cross-section of the aluminum alloy tubing viewed from one longitudinal end thereof has an airfoil section shape and an integral hollow structure is formed inside the aluminum alloy tubing.   
     
     
         6 . The manufacturing method according to  claim 4 , wherein the rotor blade is formed using an aluminum alloy tube having a structure in which both longitudinal ends thereof are closed as the aluminum alloy tubing. 
     
     
         7 . The manufacturing method according to  claim 5 , wherein the rotor blade is formed using an aluminum alloy tube having a structure in which both longitudinal ends thereof are closed as the aluminum alloy tubing.

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