Item 1084
OTHER:
Aerodynamics - General - Blade Area [Ab]
Basic Algorithm:
Total area of all blades = Rotor radius x Chord of blade x Number of blades.
Ab = R * c * b
Notes:
If the blade is tapered then chord
c must be modified to define thrust-weighted solidity.Function tapered_blade()
is in FORM: Blade Taper. It does not appear to be called during a run of FORM: Helicopter. I have not check the coding neither.It appears that the
cutout ratio is taken into account when calculating horsepower etc. but , by convention, the program does not deduct the cutout when calculating blade loading and disk area and loading. For large cuttouts, this may be significant.Blade Area
Ab = (b) x (chord @ 0.75R) x R ~ From the Technical Documents on ABC ~ Forward Flight Performance of a Coaxial Rigid Rotor, by V. M. Paglino, dated May 1971, which is about the rotors in the Ames full scale wind tunnel.
Effective Total Blade Area: [
AbEff]Consider the change in area if ABC is considered. This is probably relevant to the Disk Area and the Solidity Ratio as well.
Perhaps the effective ratio will be a factor of the lateral dissimetry of lift ~ which in turn is based on the forward velocity and the RRPM?
Access Database:
FUNCTION: blade_area()
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Last Revised: March 18, 2007