Helicopter Wakes -- The prediction of inflow to a helicopter rotor and the
wake velocities below and behind are vital to the calculation of airloads
on the rotor blades of a helicopter. DOWN, from NASA Langley Research
Center, is a computer program that assists designers with such
predictions. DOWN was created to implement a flat wake theory, a simple
analysis for the calculation of rotor inflow and wake velocities. The
analysis essentially treats the rotor wake geometry as rigid without
interaction between induced velocities and wake structure. The code will
predict three orthogonal incremental components of flow velocity at any
point in any plane parallel or perpendicular to the rotor disk. Input to
the code is entered interactively through the computer keyboard. The coded
version of flat wake theory as implemented in DOWN provides vertical
inflow patterns similar to experimental patterns for helicopter flight
speeds greater than 60 knots.

DOWN, LAR-14841, is written in FORTRAN 77 for IBM PC series and compatible
computers running MS-DOS. It requires 56K of RAM for execution. This
package includes sample executables which were compiled under Microsoft
FORTRAN. The standard distribution medium for this program is one 5.25
inch 360K MS-DOS format diskette. Program $200; documentation $13.

COSMIC
The University of Georgia
382 East Broad St, Athens, GA 30602-4272
706-542-3265,  FAX: 706-542-4807

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