Appendix 4B The Three Case Helicopters: Lynx, Bo105 and Puma

4B.1 Aircraft configuration parameters The DRA (RAE) research Lynx, ZD559

The Westland Lynx Mk 7 is a twin engine, utility/battlefield helicopter in the 4.5-ton category currently in service with the British Army Air Corps. The DRA Research Lynx (Fig. 4B.1) was delivered off the production line to RAE as an Mk 5 in 1985 and modified to Mk 7 standard in 1992. The aircraft is fitted with a comprehensive instrumentation suite and digital recording system. Special features include a strain-gauge fatigue usage monitoring fit, and pressure – and strain-instrumented rotor blades for fitment on both the main and tail rotor. The aircraft has been used extensively in a research programme to calibrate agility standards of future helicopter types. The four-bladed hingeless rotor is capable of producing

Fig. 4B.1 DRA research Lynx ZD559 in flight

Table 4B.1 Configuration data – Lynx

ao

6.0/rad

Izz

12208.8 kg m 2

xcg

-0.0198

a0T

6.0/rad

Ke

166 352 N m/rad

•50

0.009

atp0

-0.0175 rad

lfn

7.48 m

52

37.983

efn0

-0.0524 rad

ltp

7.66 m

53

-45°

c

0.391 m

It

7.66 m

5T0

0.008

gT

5.8

Ma

4313.7 kg

5T2

5.334

hR

1.274 m

Nb

4

Ht

1.146m

R

6.4 m

Y

7.12

Ie

678.14 kg m 2

Rt

1.106m

Ys

0.0698 rad

Ix:x

2767.1 kgm2

Sfn

1.107m2

>2

1.193

Ixz

2034.8 kg m 2

Stp

1.197m2

&tw

-0.14 rad

Iyy

13 904.5 kg m2

sT

0.208

&idle

35.63 rad/s

Подпись: 262 Helicopter Flight Dynamics: Modelling
Подпись: 2.946 m

large control moments and hence angular accelerations. A 1960’s design, the Lynx embodies many features with significant innovation for its age – hingeless rotor with cambered aerofoil sections (RAE 9615, 9617), titanium monoblock rotor head and conformal gears.

A three-view drawing of the aircraft is shown in Fig. 4B.2. The physical characteristics of the aircraft used to construct the Helisim simulation model are provided in Table 4B.1.

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