Unified Engineering Fall 2003
Fluids Quiz 1 (QF5) Page 1/3
1. (30 %) A proposed winged blimp design flies at some angle of attack �, and uses both
aerodynamic lift and aerostatic lift (buoyancy) to generate its total lift force L. The blimp
has a given shape, but its length c is as yet undecided.
�
c
a) In addition to the given � and c, list all the remaining physical parameters which signifi-
cantly influence L.
g(L,�,c,...)=0
b) Determine a set of nondimensional parameters (or Pi products) which describe this situ-
ation.
c) Identify the nondimensional parameter which determines whether or not the aerodynamic
force is significant compared to the buoyancy force.
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