Lateral behaviour .pdf



Nom original: Lateral behaviour.pdf
Auteur: Famille Scherrer

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Lateral behaviour
V tail vs Cross tail
AVL computations
http://sailplane-matscherrer.blogspot.com/
matthieu.scherrer@free.fr

A. Roll rate
1) intial roll input
5deg of aileron,
beta so that Cn=0  to mesure “adverse yaw due to aileron deflection, induced drag part”

Much more beta with V than +
Reduced rolling moment for V (Clbeta)
Pitch up trend (deflection at tail ?)
Numerical problem with induced drag for + (interaction in HTP/VTP corner ?)

2) Sustained rolling movement, non coordinated.
5deg of aileron
P so that to equilibrate rolling moment -> yawing due to p
Beta so that to equilibrate yawing moment

Very similar beta excursion V or +
A bit more pitch rate with a cross tail
Quite pitch neutral in both cases

3) Sustained rolling, coordinated
5deg of aileron
P so that to equilibrate rolling moment -> yawing due to p
Rudder so that to equilibrate yawing moment

Rudder deflection are not in the same ratio as rudder eff (+/V 1.7 on deflection, for 0.6 on eff)
A bit more pitch rate with a + tail
Pitch neutral for + tail, not for V
B. Steady turn
0) Parameters freeze

Bank angle : 45deg
CL : 1.1/V=
 p& r axe freezed corresponding to this path
1) Steady turn, not coordinated
Ailerons so that to keep Cl=0
Elevator so that to keep Cm=0
Beta so that to keep Cn=0

Elevator position in the same way as efficiency on Cm
Similar aileron position
A bit more sideslip in case of V tail
V-tail much more loaded than HTP/VTP for +  local normal force to be studied

Rear surface loading : VTP Cy=0.02 HTP Cz=0.13/0.18
V tails : Cz =0.13/0.18

2) Steady turn, coordinated
Ailerons so that to keep Cl=0
Elevator so that to keep Cm=0
Rudder so that to keep Cn=0

Rear surface loading : VTP Cy=0.03, HTP Cz=0.14/0.18
V tails : Cz =0.13/0.19



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