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A piston engine has bhp of 600 at sea level. Now, if engine is operating at an altitude where density ratio is 0.816 then, find the value bhp at that altitude.(a) 37(b) 89(c) 100(d) 289I had been asked this question during an interview.Question is from Propulsion topic in portion Propulsion of Aircraft Design

Answer»

Right OPTION is (a) 37

The best I can explain: Given, sea level bhp, p1 = 600, density ratio d = 0.816

Now, bhp at an ALTITUDE = p1*(d – ((1-d)/7.55))

= 600*(0.814-((1-0.814)/7.55))

= 600*(0.814-(0.1836/7.55)

= 600*0.0616 = 37.



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