
#1
Dec810, 08:44 AM

P: 23

Can anyone help me?
I'm doing a question on aircraft propulsion technology and i'm stuck. The question is: 'If the mass of air through a propeller is 1000 Kg/s, the aircraft's velocity is 100 m/s and the slipstream velocity is 120 m/s, calculate the thrust? Attempt at answer: Surely if F = ma then the equation should be F = 1000 * 100 = 10000 Kg/s But I don't think this is the right answer as I have not taken the slipstream velocity in to consideration. The only other equation I can find is F = (m dot * V)e  (m dot * V)0 + (pe  p0) * Ae But I don't have pe or p0 or Ae neither do I understand what they are. Can someone please steer me in the right direction? Thanks 



#2
Dec810, 01:01 PM

P: 8

Hi, with the given conditions, thrust can be calculated by using the formula:
Thrust = Mass airflow X (slipstream velocityaircraft velocity). Below website has good information may be it helps you. http://www.flightlearnings.com/basic...parttwo/384/ 



#3
Dec810, 01:36 PM

P: 23

Thanks very much.
It seems so simple now, just couldn't see it. Thanks again 


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