By Dr. Larry Scheweikart
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Extra info for The Hypersonic Revolution: Case Studies in the History of Hypersonic Technology Volume III
Since the calculations center mainly around the propeller efﬁciency determination, it is convenient to analyze the turboprop performance in terms of the power expressions. 63) where SHP is the installed shaft horsepower. 65) from which one can calculate the total power available as THP ϭ ESHP p The drag of a turboprop-driven aircraft must be stated in terms of power required, and the basic performance analysis follows that of a typical propeller-driven aircraft. 1 GLIDING FLIGHT Glide Angle and Sinking Speed There are two basic approaches for the determination of the aircraft glide performance: power-off, and partial power-on.
16) A comparison of Eqs. 16 shows that reciprocating engine performance should be considered from a power-available/powerrequired point of view and the jet engine case reduces to thrustavailable/thrust-required formulation. The thrust of a jet engine can often be described by analytical statements that can lead to simple performance calculations and analytical solutions (Appendix D). For propeller-powered aircraft, the power information is usually given in graphical form, which implies that the propeller engine performance problems are best solved in graphical or numerical form.
To determine these respective locations, Eq. 55 will be differentiated with respect to the velocity. Setting the result equal to zero, one obtains for the velocity at minimum power VPmin ϭ Ί ͩ ͪ 2Wn k S 3CD0 1/4 By comparison with Eq. 57) The minimum power required is found by substituting VPmin into Eq. 58) An inspection of Eq. 58 reveals that, for minimum power required, the induced power required is three times the parasite power required. 61) where VPmin is given by Eq. 56. Although these minimum expressions will not be used immediately, they are useful for determining the general shape of the power required curve and are essential later for establishing other performance parameters.
The Hypersonic Revolution: Case Studies in the History of Hypersonic Technology Volume III by Dr. Larry Scheweikart