[Unified-mailman] Re: p1 Sol

[Ian Waitz]

Ryan,

Correct.  P1 solutions don't answer the question (y-force on the 
vanes).  The force solved for in the solutions is the y-force on the 
mass in the control volume (down -- which you can see by inspection 
since the flow is pushed in that direction).  So the y-force on the 
vanes (what the problem asked for) is equal and opposite to this: up.

Sorry for not catching this.

- Ian

>Professor,
>
>Please explain why the force in P1 part d) is negative when the vanes
>are pushing downwards on the flow  implying that the flow is pushing
>upwards on the vanes.
>
>Just as you showed in recitation today, shouldn't the force on the vanes
>be away from the center of curvature of the vanes? ie towards the 1st xy
>quadrant?
>
>Ryan


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M A S S A C H U S E T T S  I N S T I T U T E  O F  T E C H N O L O G Y

Ian A. Waitz                       
Professor and Deputy Head                  
Department of Aeronautics and Astronautics

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