Mods to the .PAR file

[mrr]

I find that on a few models I cannot completely trim the plane properly, even with with full left trim on my aileron and rudder the plane still tends to fly to the right. Other models are fine. I've looked at the par file but cannot determine if modifying one of these parms might allow me to correct the situation. Any thought?

[Carrnutt]

this page has a link to english translation of par file..

http://home.introweb.nl/~erics/fms/

on some planes you may be able to set trim all the way left or right then recalibrate controller so you can trim more.


hope this helps:)

(Edited by Carrnutt at 9:52 pm on Oct. 12, 2001)

[nikolaou]

This is the description of the variables in .par files


Design name
Thrust in newton
Rudder movement in radian
Elevator movement in radian
Aileron movement in radian
Wing lift coefficient, maximum
Wing lift coefficient, minimum
Wing lift curve slope, pre-stall
Wing lift curve slope, post -stall
Wing drag coeffcient, minimum
Fuselage drag coeffcient
Runway friction coeffcient
Wing drag coefficient factor, post-stall
Wing moment coefficient
Wing incidence in radian
Wingspan in meters
Wing chord in meters
Center of Gravity position in meters
Mass in kg
Yaw inertia in kg*m^2
Pitch inertia in kg*m^2
Roll inertia in kg*m^2
Elevator area in m^2
Rudder area in m^2
Distance to tail group in meters
Dihedral factor sin(0.5 * pi / 180)
Height above runway in meters
Surface visibility parameter


Enjoy!

(Edited by nikolaou at 10:41 am on Oct. 15, 2001)

[johnhlong]

[nikolaou]

This is an actual .par file from a hilo.

1 iModelStyle (0 = airplane / 1 = helicopter)

2.0 Mass (MASS) [ kg ]
0.10 Moment of inertia around the vertical axis (fIHochachse)
0.10 Moment of inertia around the transverse axis (fIQuerachse)
0.10 Moment of inertia around the longitudinal axis (fILaengsachse)
2.0 Rotation resistance

30 Exponentially Elevator (expnick) [ % ]
30 Exponentially roll (exproll) [ % ]
0 Exponentially Gier (expgier) [%]
0 Exponentially Pitch (exppitch) [%]

0.65 A main rotor blade (lRot) [ m lengthens ]
0.055 Surface of the entire main rotor (aRot) [ m^2 ]
1700 Revolutions per minute of the main rotor (upmRot) [ 1/min ]
0.10 Collective blade control of the main rotor (akol) [ wheel ]
0.008 Cyclic blade control nodding the main rotor (azykln) [ wheel ]
0.008 Cyclic blade control roles of the main rotor (azykln) [ wheel ]
0.10 Height of the Rotos over the emphasis (hRot) [ m ]
0.005 Back turning inclination by horizontal incident flow (fhorzd)

0.125 A tail rotor blade (lRoth) [ m lengthens ]
0.020 Surface of the entire tail rotor (aRoth) [ m^2 ]
7200 Revolutions per minute of the tail rotor (upmRoth) [ 1/min ]
0.12 Collective blade control of the tail rotor (akolh) [ wheel ]
0.009 Basic angle of incidence of the tail rotor (alpha0h) [ wheel ]
0.75 Distance of the tail rotor axle of the emphasis (LH) [ m ]
0.25 Greed inclination by lateral incident flow (fhorzdh)

0.03 Sensitivity of the gyroscope (hstab) [ rad/(rad/s) ] // - 0,007 = 0%, 0,05=100%
80 Per cent of fading out the gyroscope with was appropriate the tail rotor (hstabdel) [ for % ]

6.2 Lift rise (DCA)
1 Max. coefficient of lift (camax)
-1 Minimum coefficient of lift (camin)
0.02 Coefficient of drag with zero lift (cw0)
0.02 Resistance rise (dcw)
0.3 Coefficient of drag of the trunk (cwR)

9 Points of chassis:

0.3 PosX
0.3 PosY
-0.15 PosZ
1.0 mueh
2000 h [N/m]
10 muev
800 fmax

0.3 PosX
-0.3 PosY
-0.15 PosZ
1.0 mueh
2000 h [N/m]
10 muev
800 fmax

-0.2 PosX
-0.2 PosY
-0.15 PosZ
1.0 mueh
2000 h [N/m]
10 muev
800 fmax

-0.2 PosX
0.2 PosY
-0.15 PosZ
1.0 mueh
2000 h [N/m]
10 muev
800 fmax

-0.8 PosX
0 PosY
-0.09 PosZ
2 mueh
2500 h [N/m]
10 muev
50 fmax

0.5 PosX
0.5 PosY
0.1 PosZ
2 mueh
2500 h [N/m]
10 muev
5 fmax

0.5 PosX
-0.5 PosY
0.1 PosZ
2 mueh
2500 h [N/m]
10 muev
5 fmax

-0.5 PosX
-0.5 PosY
0.1 PosZ
2 mueh
2500 h [N/m]
10 muev
5 fmax

-0.5 PosX
0.5 PosY
0.1 PosZ
2 mueh
2500 h [N/m]
10 muev
5 fmax

Enjoy !

(Edited by nikolaou at 1:26 pm on Nov. 12, 2001)