OTHER: Aerodynamic -Drag - H-force [H]
The rotor drag force. The horizontal force perpendicular to the rotor shaft.
There is also an F-force;- the rotor side force
Information:[Source ~ RWP1 p.175 & 478]
CH/ σ0 = (cd * μ)/4
0∫2π 0∫R incomplete [Source ~ PHA algorithm.4.88]
H-force due to Flapping:
This is of interest to the SynchroLite but not to the UniCopter.
From course:MAE 466/566. Rotary-Wing Aeromechanics: which uses [Source ~ RWP1] as text.
Though choice of reference coordinate system is arbitrary, if one chooses to mix systems (as Prouty does), it is very important to make sure one doesn't "double dip" when accounting for all forces acting. This is why we will use the tip-path plane as a reference. However, this decision means we will have to rederive the expression for the H -force. (Note that figure 3.36 on page 177 is not only confusing, but wrong according to Prouty's text!)
Using a figure similar to figure 3.35 on page 174, derive an expression for dH (or DH) in terms of dL and dDpr. Be sure to point out the differences between your expression (in tip-path plane coordinates) and Prouty's (in shaft-plane coordinates). See if you can do the integration to come up with an expression for CH/s. Please do not spend too much time on this! It may be easier to do the azimuthal integration first so you can eliminate the y-terms that integrate to zero.
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Last Revised: October 9, 2008