A Specific Chart for Flying Boat Take-Off Performance

Abstract

The take-off performance of a flying boat is complicated in practice by the variety of possible combinations of the basic operating variables—weight, power, wind, and getaway speed. The desirability of a simple method of evaluating and presenting the required information is evident in view of the labor involved in computing performance for all the possible combinations of conditions involved. From early studies of Diehl and others and from later correlations of take-off data (both calculated and flight test), it has become clear tha t there exists an approximately linear relationship between the reciprocal of the take-off time and the four operating parameters listed above. I t is empirically shown in this paper that , in addition, the take-off distance is directly proportional to the product of take-off time and getaway speed. These relationships form the basis for a new type of chart for the prediction of the take-off time and distance for a specific flying boat under any reasonable combination of the operating variables or for the reduction of flight-test data to a standard of comparison.