WORKBOOK INTRODUCTION TO HELICOPTER AERODYNAMICS

.

rho

Adjustment DA Max Gross Wt (HOGE)

NONE 7800 FT 34,800 lbs

10% RULE 8800 FT 34,000 lbs

DA COMPUTER 8400 FT 34,500 lbs

40% RULE 8400 FT 34,500 lbs

m

T

rhorho

omega

FF SCVqSCAF Vq

LL SCVqSCL Vq

DD SCVqSCD Vq

SCVL V

rho

rho

rho

rho

rho

rho

lSCVL V

bcRAS bA b c R

Rbc

RbcR

AAb

RRbbA

bA A

RAT

AA

RATc

bb

T

AbA

Therefore, the student is expected to become familiar with all NATOPS performance charts prior to class.

VA2T=Power

fDiskinduced

A

A2ThrustxThrust=Power

diskinduced

A

A2Thrust=v

diski A

A2ThrustxThrust=Power

diskinduced

A

everybody else skip this part

cdrRCP D

R

Oofile R

R

O

drRcCPR

ODofile

R

O

c

RcCP Dofile c

b=

PTotal = P Induced + P Profile

ihffinduced VVVV V

diskih A

ThrustVdA

VA2T=V

fDiskinduced

A

fDiskinduced VA

TPowerDAD

Rx=

VelocityTipBladeAircraftofVelocity=ratio)(advance

xx(a

b=

b23

tipDdProfile )4.65+(1VAC81=Power

VRSRegion

A2Thrust=v

diski A

PvTP i

(b) Low Inertia .

thrustrotortotalcomponentverticalAOB v

AOBcomponentverticalthrustrotortotal v

nWLorWLn nW

WL

ggg

Vr

ngam

ngmmgma

gmWngmT

mT

mW

mT

mWa

TWmaF

Z

Z

Z

ZZ

tav Z ta

tad v ta

mkftlbMass

ftlbsStiffness

2 2

2 2

2 2