Free and Captive Balloons |
Common terms and phrases
adjustment Aeronautics airship allow altitude appendix applied attached automatic ballast ballonet band basket becomes bias cable captive balloons Caquot cause cement cent cloth coating complete connection consists construction cord cotton covered determined diameter direction distance dope drum edges effect envelope equal fabric Figure force forward gore ground holding holes hydrogen inch increased inflation inside inspected internal landing length less lift light lower maximum means meter method mooring necessary observation opening operation panel pass patch permeability pilot position possible Pounds practical pressure prevent protection pull race rigging ring rip-panel rope rubber seam Service sewing side speed square stabilizers stitches strands strength surface suspension tape temperature tensile tension tests tube United United States Army upper usually valve vertical volume weather weight winch wind wires
Popular passages
Page 108 - ... gas required exceeds this, examine the valve and its connections. See that it seats absolutely tight and is set to open at the proper time. Examine the glands, inflation appendix and rip panel. Remember that one hole one-sixteenth of an inch in diameter will let out more gas than escapes by diffusion through the entire fabric of the balloon. The greatest care must also be taken to prevent air from getting in. Gas can always be replaced but the only way to get air out is to deflate. With good...
Page 106 - In a light breeze the balloon can be anchored fully assembled and ready for flight, but unless unavoidable it should not be left in the sun for any length of time.
Page 289 - Except where otherwise noted, all determinations were made under the following standard conditions. The film or fabric is maintained at a temperature of 25° C, with air at atmospheric pressure (760 mm. of mercury) on one side of the specimen and the gas whose rate of permeation is being measured at an excess pressure of 30 mm.
Page 289 - ... factors on which it is dependent. Only the part of the program detailed in the preceding pages was completed, however, before it became necessary to discontinue the work. A simple and satisfactory picture of the process is one of dynamic equilibrium, in which the gas is dissolved at one side of the rubber at a rate proportional to its solubility and partial pressure and diffuses through the rubber where it evaporates from the other side. The same process takes place in the opposite direction,...
Page 90 - These are attached to the envelope and stabilizer by means of fabric suspension bands "A," "B" and "C," constructed with built-in suspension patches similar to the main suspension band on the outside of the envelope. The rigging ropes are tied to the patches of the suspension bands by German bowline knots, with the loose ends tucked between the strands of the rope. The loose end is...
Page 44 - The general weather situation was a large "high" spreading over nearly the whole of Europe, and an equally large "low" trying hard to press in from the west. The only sure inference was that as soon as the "low" arrived within feeling distance we would have pronounced surface winds from the south and later from the west, with the usual variations corresponding to the altitude. At the start our direction was much the same as the other • A somewhat different viewpoint is set forth in "Aerostatics
Page 108 - For the balloon to operate satisfactorily, the purity of the gas should not fall below 90 per cent. During this operation the same precautions in regard to lights and leaks should be taken as during inflation. The picket ropes should be loosened as the gas flows in. Gas should be added until the normal working pressure is restored. By normal working pressure it is not meant that the balloon should be filled until the valve blows.
Page 104 - This is a circular hole in the envelope located five panels back from the toe of the vertical stabilizer and on the bottom center line of the envelope. It provides an opening between the vertical stabilizer and the air chamber of the envelope for the distribution of air from the stabilizer to the air chamber. It also provides a manhole for a passageway for inspection purposes. Ballonet appendix manhole.