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Aviation History
1927
1927 - 0962.PDF
necessarily be of an easily detachable nature, for the envelope is best made separate from the keel, the latter being designed either to fold up or be capable of being dis- mantled and easily assembled ready for attaching to the envelope. Obviously the weight of structure of the semi-rigid is far below that of the rigid model of the same dimensions, and hence a greater load will be available for power units. The power unit for small models might well be of the usual elastic type which gives such good results on the model aeroplane. The craft will travel at a lesser speed, however, and hence large airscrews turning more slowly would probably be found more efficient. Compressed air units lend themselves to incorporation in the car of the model airship, and would be quite efficient in every way. For purposes of control, however, it would appear that some form of electric power plant would be most suitable, provided that an electric motor of light enough weight may be obtained. Power leads could be hung down from the model, which could not be expected to lift its own DECEMBER 22, 1927 batteries ; these might be carried conveniently on the carrier of a cycle. The question of ballonets or air balloons for maintaining internal pressure after loss of gas, has not been considered, because for and aft trim of the model before flight can be obtained by suitably arranging ballast weights, and as the model ship will probably not be required to fly at high altitudes, the envelope will not require gas-release valves. To conclude with a word of warning—Don't lesve go of your model after it has been inflated, unless you are out to do an altitude record. Note—-We would be very glad if any reader who has had experience with model airships could assist the present movement by supplying such information he may possess, which would be of considerable help to those who are very anxious to launch forth on the somewhat unknown problem of model airship construction and flying. While we are aware that there have not been many experimenters in this connection, we know that a few attempts at lighter-than-air models have been made in the past. Existing Routes Projected Routes - — D 1924 1925 1926 1927 1924 I 1925 i 1926 1927 1924 I 1926 1926 1927 NUMBER OF FLIGHTS NUMBER OF PASSENGERS Kg B 0,000 15000 I0.0OO 5,000 0 LUGGAGE Kg- 800 600 2O0 0 AIR MAIL. Kg E0.000 15,000 IO,D0O 5,000 0 GOODS Kg 40.000 30,000 20.000 10,000 0 LOAD CARRIED (TOTAL) HOURS FLOWN REGULARITY 100 75 50 E5 o CIVIL AVIATION IN CZECHOSLOVAKIA : From the Czechoslovak State Air Lines we have just receivedsome statistics concerning civil aviation during the last four years. We have thought that a graphic representation of the results would, perhaps, convey a rather better idea than figures arranged in tables,and have therefore prepared the above charts, which are self-explanatory. 870
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