Flight Test Evaluation of a Method to Determine the Level Flight Performance of a Propeller-Driven Aircraft

Bridges, Philip D.; Cross, E. J.; Boatwright, Donald W.

doi:10.4271/770470

Cited by 3 publications

(2 citation statements)

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“…The most common approach is to determine aircraft drag using data from power-off glides. Then Ẇu is determined from the equality of thrust and drag in steady flight and P mech is determined either by direct measurement of engine torque or from calibrated engine performance curves (Bridges 1976). Another approach is to determine drag from the change in aircraft performance after a known, incremental increase in drag and then compute η P as before (Bridges 1976).…”

Section: Introductionmentioning

confidence: 99%

“…Then Ẇu is determined from the equality of thrust and drag in steady flight and P mech is determined either by direct measurement of engine torque or from calibrated engine performance curves (Bridges 1976). Another approach is to determine drag from the change in aircraft performance after a known, incremental increase in drag and then compute η P as before (Bridges 1976). In this case, it is not necessary to assume equality of aircraft drag in powered and unpowered flight.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of propulsive power and evaluation of propulsive performance from the wake of a self-propelled vehicle

Krueger¹

2006

Bioinspir. Biomim.

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Propulsive efficiency is a key indicator of propulsive performance, but it can be difficult to measure when the propulsion system is integrated into the vehicle body because the average rate of useful work done propelling the vehicle (Wu) and/or the average mechanical power expended propelling the vehicle (Pmech) is not known directly. A general approach would be to determine either or both of (Wu) and (Pmech) from the vehicle wake. The present discussion demonstrates that only (Pmech) can be determined from the flow crossing a plane a fixed (average) distance downstream of the vehicle. A method for measuring (Pmech) is presented using the observation that the power required to tow a permeable obstruction behind the vehicle depends on (Pmech). Several methods for evaluating propulsive performance using [Formula: see text] are proposed, including the definition of an equivalent jet velocity and corresponding Froude efficiency if the time-averaged mass flow rate through the propulsion system is known. If only (Pmech) is known, the recommended measure of propulsive performance is a power coefficient defined analogous to a drag coefficient.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%