Patent ID: 6860449

Claim:
An air vehicle comprising: (a) one and only one main wing means for both generating aerodynamic lift and carrying payload, and (b) said main wing means having a wing shape of a straight wing, and (c) at least one internal payload cabin means for carrying payload being constructed inside said main wing means, and (d) said main wing means having two wingtips which being the two tips of said main wing means, and (e) at least one buoyancy hull means for generating static lift by containing lighter-than-air gas being installed at each of said two wingtips, and (f) said main wing means having said buoyancy hull means installed at both of its said wingtips only and no other part of said main wing means being installed with said buoyancy hull means, and (g) at least one propeller means for generating forward-flying thrust being connected to said main wing means, and (h) each of said propeller means rotating around an axis of rotation, and (i) said axis of rotation extending toward the forward flying direction of said air vehicle in a way that when said air vehicle cruising horizontally, there being a first angle between said axis of rotation and a horizontal plane, and there being a second angle between said axis of rotation and a vertical line, and the sum of said first angle and said second angle being 90°, and said first angle being smaller than said second angle.