rolls in FMS Very SLOWWWW

[kushal_22]

How do i get more Aileron Authority?

Regards
Mal

[ggunners]

The best way is to either increase the area of the control surface or increase the angle the control surface travels.

Use Windows Notepad or Mr. Masuoka's .par editor
http://rcp.web.infoseek.co.jp/fms_e.html#A8Editor_Converter
to edit the .par file.

Also, the roll authority could be affected by the Roll Inertia Moment Ixx under the MAIN section of the .par file. Try reducing it to get an easier and snappier roll. A number like 0.03 is good for small and light models while numbers of .3 or .4 are better for heavier larger models.

-- ggunners

[kushal_22]

I can see i am going to have to learn more about FMS....and computer Jargon....so far it is all greek I thank you though. You have given me a place to start

Regards
Malcom

[ggunners]

Actually, you do the same thing with an FMS model you'd do with a real model you built yourself.

If you're not happy with the roll rate on an actual RC airplane you either increase your throws, say instead of 1/2 inch each direction from horizontal, you change that to 3/4 inch each direction from horizontal. Both 1/2" and 3/4" are just a way of describing the maximum angle the aileron travels.

The other option you have with a real model is to make the ailerons bigger. Same thing in FMS, give the aileron's more physical area and they'll exercise more roll authority.

There's one other thing you might try too. As with an actual model, the faster you fly, the more pronounced the effect of the control surfaces. So, speeding up a model within FMS will also increase roll rates.

-- ggunners

[Daniel G]

Try reducing it to get an easier and snappier roll. A number like 0.03 is good for small and light models while numbers of .3 or .4 are better for heavier larger models.

-- ggunners
And here I had been increasing it to get a better roll. Was that a typo?

[Looooeeee!]

Sometimes it's as easy as increasing the degree of angle in the surface flap part of the PAR. Here's an example from my recently uploaded Bristol F2b WWI bipe. This is the upper two wings, left first and then right, as Flaches #1 and 2.

WING //Flächen (surfaces)

//Fläche Nr. 1 Surface number 1, left wing, if aileron then channel 3
0.041 -0.382 -0.184 //Position [m] (position)
1 0 0 //ex (unit vector in flight direction
0 0.993 0.034 //ey (unit vector in direction of wing span)
1 //Polare (Nr.) (polar number used below)
0.78 //Flächenbreite (Spannweite) [m] (surface width - span)
4 //Anzahl Elemente (number of elements)
AUTOELEMENT //Alle Elemente sind gleich gross (all elements have equal size)
2.1 //Anstellwinkel [°] (angle of attack)
0.2200 //Flächentiefe Anfang [m] (chord length at the first end)
0.2200 //Flächentiefe Ende [m] (chord length at the second end)
0.070 //Klappentiefe [m] (chord length of the flap)
0.001 //Klappenanfang [m] (start position of the flap)
0.32 //Klappenende [m] (end position of the flap)
-10 //maximaler Ausschlag [°] (maximum flap deflection)
3 //Kanal (channel)

//Fläche Nr. 2 Surface number 2, right wing, if aileron then channel 3
0.041 0.382 -0.184 //Position [m] (position)
1 0 0 //ex (unit vector in flight direction
0 0.993 -0.034 //ey (unit vector in direction of wing span)
1 //Polare (Nr.) (polar number used below)
0.78 //Flächenbreite (Spannweite) [m] (surface width - span)
4 //Anzahl Elemente (number of elements)
AUTOELEMENT //Alle Elemente sind gleich gross (all elements have equal size)
2.1 //Anstellwinkel [°] (angle of attack)
0.2200 //Flächentiefe Anfang [m] (chord length at the first end)
0.2200 //Flächentiefe Ende [m] (chord length at the second end)
0.070 //Klappentiefe [m] (chord length of the flap)
0.46 //Klappenanfang [m] (start position of the flap)
0.78 //Klappenende [m] (end position of the flap)
10 //maximaler Ausschlag [°] (maximum flap deflection)
3 //Kanal (channel)

The number to left of maximum flap deflection is the angle of deflection in degrees, the two numbers above it also have an effect as they are the actual span of each individual aileron. and the angle of the flap is set at a low angle 'cause I've modeled all four ailerons like the real Brisfit had. I have this thing about trying to model the real flight behaivior of these old planes, they had quite a bit of adverse yaw. (the wobble side to side you can see in a Zagi when you slam the aileron stick side to side is an example Mal..) These old planes were definately rudder steerers. You initiated the turn by getting the largest bit of it's inertial bulk moving, which in a lumbering WWI two seater would be the yaw axis. Then initiated the roll and added some up elevator to compensate for the drag of the control movements and to keep from slowly spiralling in. In some WWI models you need to keep a small bit of reverse aileron fed in to keep the turn from getting too banked over. My Brisfit does this a tiny amount. If you have it downloaded try doing slightly banked, (or nearly flat) turns with it.

Looee

[Daniel G]

So I'm going to have to learn german or what ever language thats in?! :eek:

[ggunners]

Well, FMS was created by the brothers Moeller in Germany. So out of the gate the comments were German. You can see the English translation right next to them. I've left them both in my .par files when it makes sense.

Mr. Masuoka's .par editor is a bit more intuitive.

Either increase the throws in degrees
10 //maximaler Ausschlag [°] (maximum flap deflection)

or increase the area of the aileron.
0.070 //Klappentiefe [m] (chord length of the flap)

Both will give you higher roll rates.

-- ggunners

[Daniel G]

OK.
Where's the numbers in the paredit program. I can't seem to find them? :o

[ggunners]

Here's a picture of the WING section of the .par file in the ParEdit program. Ailerons are adjusted by flap width and degree deflection.

[Daniel G]

Here's a picture of the WING section of the .par file in the ParEdit program. Ailerons are adjusted by flap width and degree deflection.
Thanks. :cool:

[kushal_22]

Hey Guy`s

What Planes do you like to fly the Most and where did you download them from?

Happy sim fling
Mal

[Daniel G]

My eZipper that I created myself. :)

[Looooeeee!]

Oh I'm somewhat partial to most of the ones I've made, but there are some others that I've redone the PAR to that get flown often. I'm a big fan of Logic_Wizard's creations, especially his commercial airliners and the FOKKER DR1.

I'd say my Austin Tripe, the Brisfit, and the RAF FE2b here lately get flown a lot.