Not used for the VC, but there are several types ("classes") of contact points in FS2002. Looking in the Aircraft.cfg for the default aircraft (especially the heavies) will show comment lines that tell what most of them are for, but beware -- there is one particular glaring error that is repeated over and over. I have re-written the [contact_points] comments section with all of the (corrected!) info I could find and copied it as below into most of my planes' aircraft.cfg files:
Originally Posted by CTarana45
I have also renumbered the fields because I normally start counting from one, not zero. The most common error you'll find here is that in many aircraft.cfg files as well as several online posts, floats are said to be class 3. In FS2002, skis and skids are class 3; class 4 is for floats (or hulls of flying boats) -- this may be a change from other FS incarnations. Class 5 (water rudders) is hardly mentioned anywhere. Each place I wrote "wheel" in field 14, also includes tips of skis/skids and floats -- referring to the sounds you'll hear when landing.
//1 Class <0=none, 1=wheel, 2=scrape, 3=ski/skid, 4=float, 5=water rudder>
//2 Longitudinal Position (feet, +=fwd)
//3 Lateral Position (feet, +=right)
//4 Vertical Position (feet, +=up)
//5 Impact Damage Threshold (Feet Per Minute, vertical)
//6 Brake Map (0=None, 1=Left, 2=Right)
//7 Wheel Radius (feet)
//8 Steer Angle (degrees)
//9 Static Compression (feet - 0 if rigid)
//10 Max/Static Compression Ratio (must be at least 1.0; 1.0='bottomed out' when plane is parked)
//11 Damping Ratio / Water Rudder Effectiveness (0=Undamped, 1=Critically Damped) / 1.0 = normal
//12 Extension Time (seconds)
//13 Retraction Time (seconds)
//14 Sound Type <0=left/center nose/tail wheel, 1=right nosewheel, 2=left mainwheel,
// 3=right mainwheel, 4=nose scrape, 5=left wingtip scrape, 6=right wingtip scrape,
// 7=vertical stabilizer scrape, 8=belly scrape, 9=tail scrape>
//15 Airspeed limit for retraction (KIAS)
//16 Airspeed that gear gets damage at (KIAS)
I'd guess that the 6 contact points you're seeing are the 3 wheels as class 1, and the 2 wingtips plus the nose/prop as class 2 (scrape points).
Oh, one more note about the wheels: the vertical position (field 4) will be modified by the static compression (field 9) when the plane is at rest on the ground. So if for example an aircraft with tricycle gear has all of its wheels at -5.0 feet below the CG and the static compressions as 1.0 feet, the actual CG height for the parked plane should be 4.0 feet. If all of this plane's contact point data are correct, when you load a flight which was saved in paused condition with this plane parked, and go to Spot view before you unpause it, you will see the wheels sunk into the ground by 1.0 feet. If you stay in this view and unpause it, you should see the wheels "jump" to rest exactly on the ground surface, while the fuselage hardly moves at all.