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Inside Mac Games Volume 6 #2
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X-Plane HSR
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Text File
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1998-04-03
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8KB
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159 lines
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X-Plane, by Austin Meyer
Simulating Citation X.acf
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Finite Wing for Left Wing #1
Oswalds efficiency factor based on AR (7.12) and sweep (37 deg) is 0.60.
Thoretical lift-slope reduction is to 68% of the 2-D value.
We will accomplish this by:
using coefficient data at an angle of attack that is 78% of actual,
and reducing airfoil lift coefficients to 90% of their 2-D value.
Based on AR and sweep, cm change is to 52% of it's 2-D value.
Based on AR and TR, aerodynamic center is moved 46% of the way from the the 25% chord to the 50% chord.
Finite Wing for Right Wing #1
Oswalds efficiency factor based on AR (7.12) and sweep (37 deg) is 0.60.
Thoretical lift-slope reduction is to 68% of the 2-D value.
We will accomplish this by:
using coefficient data at an angle of attack that is 78% of actual,
and reducing airfoil lift coefficients to 90% of their 2-D value.
Based on AR and sweep, cm change is to 52% of it's 2-D value.
Based on AR and TR, aerodynamic center is moved 46% of the way from the the 25% chord to the 50% chord.
Finite Wing for Left Horizontal Stab/Canard
Oswalds efficiency factor based on AR (5.56) and sweep (41 deg) is 0.68.
Thoretical lift-slope reduction is to 65% of the 2-D value.
We will accomplish this by:
using coefficient data at an angle of attack that is 76% of actual,
and reducing airfoil lift coefficients to 89% of their 2-D value.
Based on AR and sweep, cm change is to 45% of it's 2-D value.
Based on AR and TR, aerodynamic center is moved 43% of the way from the the 25% chord to the 50% chord.
Finite Wing for Right Horizontal Stab/Canard
Oswalds efficiency factor based on AR (5.56) and sweep (41 deg) is 0.68.
Thoretical lift-slope reduction is to 65% of the 2-D value.
We will accomplish this by:
using coefficient data at an angle of attack that is 76% of actual,
and reducing airfoil lift coefficients to 89% of their 2-D value.
Based on AR and sweep, cm change is to 45% of it's 2-D value.
Based on AR and TR, aerodynamic center is moved 43% of the way from the the 25% chord to the 50% chord.
Finite Wing for Vertical Stabilizer #1
Oswalds efficiency factor based on AR (1.69) and sweep (54 deg) is 0.88.
Thoretical lift-slope reduction is to 43% of the 2-D value.
We will accomplish this by:
using coefficient data at an angle of attack that is 61% of actual,
and reducing airfoil lift coefficients to 82% of their 2-D value.
Based on AR and sweep, cm change is to 20% of it's 2-D value.
Based on AR and TR, aerodynamic center is moved 32% of the way from the the 25% chord to the 50% chord.
Based on fuselage and wing surface-area distribution:
The radius of gyration in roll is 2.4 meters.
The radius of gyration in pitch is 4.3 meters.
The radius of gyration in yaw is 4.6 meters.
Engine number 1, however, weighs 581 kg, and is at:
long arm= 6.0 meters.
lat arm= -1.6 meters.
vert arm= 1.2 meters.
Engine number 2, however, weighs 581 kg, and is at:
long arm= 6.0 meters.
lat arm= 1.6 meters.
vert arm= 1.2 meters.
Final radii of gyration are then as follows:
The radius of gyration in roll is 2.3 meters.
The radius of gyration in pitch is 4.6 meters.
The radius of gyration in yaw is 4.8 meters.
PROPWASH SITUATION: ('----' means no propwash on element, 1 through 4 means propwash from that engine on element).
WING ONE: ---- ---- ---- ---- ---- ---- ---- ---- FUSE ---- ---- ---- ---- ---- ---- ---- ----
HORIZONTAL STAB: ---- FUSE ----
For left wing #1:
Full slat deployment will cause coefficient data to spread out alpha-wise to 135% of original.
Full slat deployment will also change the lift coefficient by the same amount (keeping the lift SLOPE the same).
For right wing #1:
Full slat deployment will cause coefficient data to spread out alpha-wise to 135% of original.
Full slat deployment will also change the lift coefficient by the same amount (keeping the lift SLOPE the same).
x location positive aft x force positive forwards pitch/alpha pos nose up
y location positive right y force positive right roll pos right
z location positive up z force positive up yaw/beta pos nose right
elevator, aileron, spoiler positive control surface up
rudder positive control surface right
brake-yaw positive control surface deployed
differential thrust vector for yaw positive request nose right
pitch cyclic prop pitch positive request nose up
roll cyclic prop pitch positive request nose right
ELEMENT BREAK-DOWN:
----------------area ----------mac
left wing1: 5.52 square meters 3.90 meters
4.97 square meters 3.51 meters
4.43 square meters 3.13 meters
3.88 square meters 2.74 meters
3.33 square meters 2.36 meters
2.79 square meters 1.97 meters
2.24 square meters 1.59 meters
1.70 square meters 1.21 meters
right wing1: 5.52 square meters 3.90 meters
4.97 square meters 3.51 meters
4.43 square meters 3.13 meters
3.88 square meters 2.74 meters
3.33 square meters 2.36 meters
2.79 square meters 1.97 meters
2.24 square meters 1.59 meters
1.70 square meters 1.21 meters
left hstb: 7.55 square meters 1.54 meters
right hstb: 7.55 square meters 1.54 meters
vstb1: 6.90 square meters 4.07 meters
6.00 square meters 3.54 meters
5.10 square meters 3.02 meters
Based on fuselage geometry:
The frontal area of the fuselage is 4.7 square meters.
The side area of the fuselage is 32.2 square meters.
The top area of the fuselage is 29.5 square meters.
The longitudinal centroid of the fuselage is at -1.6 meters.
The vertical centroid of the fuselage is at 0.4 meters.
These dimensions, like all dimensions in this output file, are with respect to the C.G.!
DOWNWASH SITUATION: W1=wing 1
W2=wing 2
HS=horizontal stabilizer
WING ONE: ------ ------ ------ ------ ------ ------ ------ ------ FUSE ------ ------ ------ ------ ------ ------ ------ ------
HORIZONTAL STAB: W1---- FUSE W1----
Based on the left wing number one AR of 7.12,
TR of 0.25,
x-separation of 0.9 semi-spans,
and z-separation of 0.4 semi-spans,
the downwash of the left wing number one on the left horizontal stab will be 4.2 degrees per coefficient of lift
TIMES THE COSINE of the left wing number one sweep.
Based on the right wing number one AR of 7.12,
TR of 0.25,
x-separation of 0.9 semi-spans,
and z-separation of 0.4 semi-spans,
the downwash of the right wing number one on the right horizontal stab will be 4.2 degrees per coefficient of lift
TIMES THE COSINE of the right wing number one sweep.
end simulation.