검색연산자 | 기능 | 검색시 예 |
---|---|---|
() | 우선순위가 가장 높은 연산자 | 예1) (나노 (기계 | machine)) |
공백 | 두 개의 검색어(식)을 모두 포함하고 있는 문서 검색 | 예1) (나노 기계) 예2) 나노 장영실 |
| | 두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색 | 예1) (줄기세포 | 면역) 예2) 줄기세포 | 장영실 |
! | NOT 이후에 있는 검색어가 포함된 문서는 제외 | 예1) (황금 !백금) 예2) !image |
* | 검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색 | 예) semi* |
"" | 따옴표 내의 구문과 완전히 일치하는 문서만 검색 | 예) "Transform and Quantization" |
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) | B64B-003/00 |
미국특허분류(USC) | 244/45R ; 244/15 ; 244/13 |
출원번호 | US-0006698 (1979-01-26) |
발명자 / 주소 | |
출원인 / 주소 | |
인용정보 | 피인용 횟수 : 26 인용 특허 : 0 |
A tandem wing aircraft having two wings of similar area wherein a lower first wing is located at the forward end of the fuselage attached directly to fuselage structure. A second higher wing is located at the aft end of the fuselage but is aerodynamically separated from the fuselage structure by strut structure. Pitch control is achieved by increasing or decreasing the lift on either wing; but downward acting load is not required. The two wings are preferably vertically separated by 25% to 50% of the span of the wings. Control redundancy for flight safet...
In a tandem wing aircraft having a fuselage structure and lifting surfaces, the improvement comprising in combination: a lower forward wing having an aspect ratio greater than 8 and a higher aft wing having an aspect ratio greater than 8, each of said wings adapted to provide lift ranging from 40% to 60% of the combined total lift supporting said aircraft in flight, said wings producing said lift and providing normal aircraft pitch control without production of a downwardly acting load; said lower forward wing being located adjacent to and attached direc...