F-22 landing gear shock struts not animated

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105OE
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F-22 landing gear shock struts not animated

Post by 105OE »

Took me a while to find out why the F-22 is so stiff during touchdowns, taxiing etc.
There's absolutely NO shock strut movement on the main gear and way too little travel on the nose gear.
Any plans to fix this?
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Larry_R
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Re: F-22 landing gear shock struts not animated

Post by Larry_R »

This struck my curiosity because the gear compression is specified in the [contact points] section of the aircraft.cfg. My knowledge of this section is limited to how it affects pilotable boats, but the principles are roughly the same. Here's the pertinent part for the IRIS F22:
//0 Class
//1 Longitudinal Position (feet)
//2 Lateral Position (feet)
//3 Vertical Position (feet)
//4 Impact Damage Threshold (Feet Per Minute)
//5 Brake Map (0=None, 1=Left, 2=Right)
//6 Wheel Radius (feet)
//7 Steer Angle (degrees)
//8 Static Compression (feet) (0 if rigid)
//9 Max/Static Compression Ratio
//10 Damping Ratio (0=Undamped, 1=Critically Damped)
//11 Extension Time (seconds)
//12 Retraction Time (seconds)
//13 Sound Type

[contact_points]
static_pitch = 0.0
static_cg_height = 6.2
tailwheel_lock = 0
gear_system_type = 1
emergency_extension_type= 2 //None=0,Pump=1,Gravity=2

max_number_of_points = 10

// #0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15

//--- Landing Gear
point.0 = 1, 9.600, 0.000, -6.2, 2000, 0, 1.018, 55.00, 0.309, 3.000, 0.700, 2.200, 2.200, 0, 200.0, 250.0 // Nose Wheel
point.1 = 1, -9.600, -5.493, -6.2, 2500, 1, 1.666, 0.000, 0.156, 2.000, 0.500, 2.500, 2.600, 2, 200.0, 250.0 // Left Wheel
point.2 = 1, -9.600, 5.493, -6.2, 2500, 2, 1.666, 0.000, 0.156, 2.000, 0.500, 2.600, 2.500, 3, 200.0, 250.0 // Right Wheel

Based on this, the left and right wheels have static compression about 2 inches, and the maximum dynamic compression is twice that. You can play with these values yourself if you are very careful; there are several interrelated factors that must correlate with the datum of the aircraft or it will crash on landing.
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105OE
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Joined: Fri Mar 18, 2016 2:33 pm
Location: lower austria
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Re: F-22 landing gear shock struts not animated

Post by 105OE »

The cfg file isn't the problem and you can define anything in the cfg file, if the animation isn't there it will not work. 'fortunately' in this case, IRIS also screwed up the static CG height, so if you press the slew key the F-22 will float a few feet above the runway.
Press the slew key again and she will drop onto the runway with no movement of the maingear shockstruts at all.
Never seen such a basic animation error before and it strongly affects the take off and touch down behaviour.
My airplane art:
https://fineartamerica.com/profiles/bernt-stolle
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