Experimental Verification of Two Methods for Computing the Take-Off Ground Run of Propeller-Driven Aircraft

In the more simple Diehl method the assumption was made that the net thrust varies linearly with airspeed. In the more refined method, point-by-point computation was made of net accelerating force from instantaneous values of ground friction, thrust, drag and lift. In the majority of cases, Diehl�...

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Bibliographic Details
Main Author: Gasich, Welko E
Format: Report
Language:English
Subjects:
ACCURACY
AERIAL PROPELLERS
AERODYNAMIC DRAG
AERODYNAMIC LIFT
AIRCRAFT
AIRSPEED
ATI COLLECTION
ATI-8158
FRICTION
GROUND LEVEL
TAKEOFF
THRUST
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Summary:In the more simple Diehl method the assumption was made that the net thrust varies linearly with airspeed. In the more refined method, point-by-point computation was made of net accelerating force from instantaneous values of ground friction, thrust, drag and lift. In the majority of cases, Diehl's approximate method checked experimental values within plus or minus 7 percent. Attempts to improve the accuracy of ground run calculations by use of the refined method did not appear warranted unless strictly applicable thrust data were available.