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Finding Lift Force  Glider Wing 
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#1
Oct2909, 12:01 AM

P: 6

I am working on my semester project and have come across a hitch. I am trying to find the Lift Force of my wing using the following equation
F_{L}=C_{L} P A (v^{2}/2) Where: F_{L} is Lift Force C_{L} is Coefficient of Lift (I think) P is the density of the fluid (Air) A is the Area V is Velocity The only portion I cannot find is Velocity. I cannot, for the life of me, figured out Velocity when given force and mass. I have a 3.33 lbf and a 27.999g aircraft. Can someone please help me. Equation so far: F_{L}=(.76764)(.076)(56.55)(V^{2}/2) 


#2
Oct2909, 01:27 AM

P: 6

I found the equation for Horizontal Velocity. Here it is for anyone else who might be stuck in the same place.
V_{H}=[tex]\sqrt{\frac{2E}{m}}[/tex] E is energy m is mass In my case Energy was elasticity since my glider was flung from a rubber band. So I had to find ftlbf, then use different conversion factors to get to a suitable velocity unit. My work: V_{H}=[tex]\sqrt{\left[\frac{2(4.1625)ftlbf}{27.999g}\right]\left[\frac{453.6g}{1 lbm}\right]\left[32.2\frac{lbmft}{lbfs}\right]}[/tex] Leaving me with Velocity in Ft/s V_{H}= 65.899 ft/s Additional Information: I was given a chart, from whence I figured that 15 in displacement gave 3.33 lbf, and converted to ftlbf, giving me my E. 


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