| 词条 | McDonnell XH-20 Little Henry | ||||||||||||||||
| 释义 |
The McDonnell XH-20 Little Henry was a 1940s American experimental lightweight helicopter designed and built by McDonnell Aircraft. DevelopmentThe McDonnell Model 38 was a lightweight experimental helicopter sponsored by the United States Army Air Force to test the concept of using small ramjets at the tips of the rotor blades. As a functional helicopter it was of simple open-frame steel-tube construction. Allocated the military designation XH-20 the first of two first flew on the 29 August 1947. Although the XH-20 flew successfully the ramjets were noisy and burnt a large amount of fuel and plans to build a larger two-seat XH-29 were abandoned. Variants
McDonnell Model 38 experimental lightweight helicopter, two built.
McDonnell Model 79 a proposed two-seat development, cancelled. Operator
Aircraft on display
Specifications{{Aircraft specs|ref= |prime units?=imp |crew=1 |capacity= |length m= |length ft=12 |length in=6 |length note= |span m= |span ft= |span in= |span note= |width m= |width ft= |width in= |width note= |height m= |height ft=6 |height in=8 |height note= |wing area sqm= |wing area sqft= |wing area note= |empty weight kg= |empty weight lb=290 |empty weight note= |gross weight kg= |gross weight lb= |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |more general= |eng1 number=2 |eng1 name=McDonnell |eng1 type=Ramjets |eng1 kn= |eng1 lbf= |eng1 note= |thrust original= |eng1 kn-ab= |eng1 lbf-ab= |more power= |rot number=1 |rot dia m= |rot dia ft=20 |rot dia in= |rot area sqm= |rot area sqft= |rot area note= |max speed kmh= |max speed mph=50 |max speed kts= |max speed note= |cruise speed kmh= |cruise speed mph= |cruise speed kts= |cruise speed note= |never exceed speed kmh= |never exceed speed mph= |never exceed speed kts= |never exceed speed note= |range km= |range miles= |range nmi= |range note= |combat range km= |combat range miles= |combat range nmi= |combat range note= |ferry range km= |ferry range miles= |ferry range nmi= |ferry range note= |endurance= |ceiling m= |ceiling ft= |ceiling note= |g limits= |roll rate= |climb rate ms= |climb rate ftmin= |climb rate note= |sink rate ms= |sink rate ftmin= |sink rate note= |lift to drag= |disk loading kg/m2 |disk loading lb/sqft= |disk loading note= |power/mass met= |power/mass imp= |power/mass note= |thrust/weight= |thrust/weight note= |more performance= |avionics= }} See also{{aircontent|see also= |related= |similar aircraft= |sequence= |lists=
}} References
}}
External links{{commons category-inline|McDonnell XH-20}}{{McDD aircraft}}{{US helicopters}} 5 : McDonnell aircraft|United States helicopters 1940–1949|United States experimental aircraft 1940–1949|Aircraft first flown in 1947|Tipjet-powered helicopters |
||||||||||||||||
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。