Wing and a multiple propeller aircraft
A wing that includes a lower portion that is located between two curved portions; wherein the lower portion is substantially flat and the two curved portions extend above the lower portion; wherein the wing defines a space that is wider than twice a diameter of a propeller that introduces a quasi-laminar stream if positioned in proximity to the wing and is circulated at a desired speed. The curved portions can be arcuated ends of the wing.
1. A wing comprising:
a lower portion that is located between two curved portions of the wing; wherein the lower portion is substantially flat and the two curved portions of the wing extend above the lower portion;
wherein the wing is arranged to support multiple engines that rotate multiple propellers, each propeller of the multiple propellers is more proximate to a trailing edge of the wing than to a leading edge of the wing and is arranged to introduce a quasi-laminar stream when positioned in proximity to the trailing edge of the wing and is circulated at a desired speed;
wherein the wing partially surrounds a space that is wider than twice a diameter of each propeller out of the multiple propellers,
wherein a tip trajectory of each propeller of the multiple propellers at least partially overlaps the space; and
multiple shrouds, each shroud being located above a propeller of the multiple propellers and partially surrounds the propeller;
wherein a combination of the lower portion of the wing and the shroud substantially surrounds the propeller.
2. The wing according to claim 1 , further comprising a pair of supplementary wings that are parallel to the lower portion and higher than the lower portion.
3. The wing according to claim 1 wherein a shape formed by the multiple shrouds differs from a mirror image of a shape formed by the lower portion and two curved portions of the wing.
4. The wing according to claim 1 wherein the curved portions are connected to supplementary wings at a location that is below half a height of the curved portions.
5. The wing according to claim 1 wherein the curved portions are connected to wing stubs that in turn are connected to supplementary wings.
6. The wing according to claim 1 wherein the trailing edge of the wing is shaped for obtaining a Coanda effect.
7. The wing according to claim 1 wherein tip trajectories of different propellers are proximate to each other.
8. An aircraft comprising:
a wing; and
multiple propellers that are rotated by multiple engines;
wherein the multiple propellers are more proximate to a trailing edge of the wing than to a leading edge of the wing, the wing comprises a lower portion that is located between two curved portions;
wherein the lower portion is substantially flat and the two curved portions extend above the lower portion and form arcuate ends of the lower portion;
wherein the wing defines a space that is wider than twice a diameter of a propeller out of the multiple propellers; wherein a majority of the lower portion is not positioned directly below any element of the aircraft; and multiple shrouds, each shroud being located above a propeller of the multiple propellers and partially surrounds the propeller; wherein a combination of the lower portion of the wing and the shroud substantially surrounds the propeller.
9. The aircraft according to claim 8 wherein the wing defines a space that is wider than three times a diameter of the propeller.
10. The aircraft according to claim 8 wherein the lower portion extends beyond the curved portions of the wing so that a rear end of the lower portion is positioned beyond a rear end of each of the two curved portions of the wing.
11. The aircraft according to claim 8 wherein an upper end of each of the curved portions of the wing is connected to an end of one shroud out of multiple shrouds that are located above propellers.
12. The aircraft according to claim 8 wherein the propellers are behind the trailing edge of the wing.
13. The aircraft according to claim 8 wherein a cross section of the wing taken along a longitudinal axis of the wing has (a) a flat lower portion that corresponds to the lower portion of the wing and (b) a pair of fraction of a circle shaped portions that extend from the flat lower portion and correspond to the curved portions of the wing.
14. The aircraft according to claim 8 wherein the curved portions are connected to supplementary wings at a location that is above half a height of the curved portions.
15. The aircraft according to claim 8 wherein a cross section of the wing taken along a longitudinal axis of the wing has (a) a flat lower portion that corresponds to the lower portion of the wing and (b) a pair of fraction of a circle shapes portions that extend from the flat lower portion and correspond to the curved portions of the wing.