By Frederick I. Ordway
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Extra resources for Advances in space science and technology. Volume 5
4) The satellite system must compete on a cost basis with cables. This cost comparison must be based both on the initial installa tion and operation cost of the system and on future capacity for growth. Many studies of the means of meeting these criteria, and of the fac tors which affect them have been made and are reported in the literature. The following material will discuss several of the factors involved and then review several of the system proposals which give an integrated world-wide system, capable of meeting the above criteria.
The fuel binder used in a composite propellant has much to do with burning rate and specific impulse. Some binders burn slowly and some rapidly, depending on chemical structure. The propellant specific impulse is also affected by the structure of the binder. Large amounts of carbon and hydrogen are desirable with little or no oxygen, chlorine, nitrogen, or sulfur. Unfortunately, most liquid polymers which can be cured by convenient methods contain some of these less desirable elements. The amount of oxidizer usually is more important than the chemical structure of the binder on such qualities as burning rate, specific impulse and density.
This indicates that time delays for communication paths reaching halfway around the world can become quite long, but in general are largest for the higher altitude systems. To see the importance of this time delay it is necessary to consider characteristics of the communication traffic. Modern telegraph traffic is handled by automatic printers which incorporate error-correction circuits. If an error is made, the receiving station sends a query to the transmitter, which stops transmission, corrects the error and resumes traffic.
Advances in space science and technology. Volume 5 by Frederick I. Ordway