Search Results

The application of the bunsen burner method of measuring flame velocities of gases is extended to liquid fuels by the use of a suitable vaporizer. The bunsen burner nozzle is enclosed and provision made for operation at elevated temperature, reduced pressure or both. The control apparatus which supplies a gaseous or liquid fuel as well as air for combustion is described in detail. The cone angle is obtained by measuring a “schlieren” image of the flame front which has been projected on a screen. Curves showing flame velocities as a function of air-fuel ratio for natural gas, gasoline, and acetylene are presented. Data were taken for temperature up to 900°F and for pressures down to 3.9″ Hg absolute.

This report covers the analysis of 473 records of collision of birds with aircraft in scheduled operations from a period previous to 1942 through 1946. Most of the reported collisions occurred in the Continental United States, but some data are given for Canada and Central and South America. The data show that a bird collision on scheduled aircraft occurs each 759,000 miles of operation, which in 1946 corresponded to an average period of 0.89 days. The type of bird most commonly struck by aircraft is the duck. Gulls and buzzards also are frequently hit in more limited geographical locations. All birds are struck most frequently during migratory seasons, and at low elevations above ground. More than one-fourth of all recorded bird strikes occur on the airplane windshield, of which about one-third result in severe damage. Approximately one-fourth of all strikes result in severe local damage to some portion of the aircraft structure.

This paper discusses the problems involved in the design and development of an ejector cooling system for the XR-10 Helicopter power plant. Basic design problems are reviewed. Test experience on exhaust stacks, nozzles, mixing chambers, diffusers, baffles, carburetors and engines are discussed in detail.