My Most Humble Thanks To Mr Shupe, t. Creed, and ManfredDC3

C

casey jones

Charter Member
It worked!!! I now can taxi the B-26B/C with no problem at all. I was just wondering if a kind
of fix could be added to the B-26 to correct the nose wheel steering? Again thank you all!


Many Cheers

Casey
 
The same method of changing the wheel castor value in the [Contact Points] section of the aircraft.cfg file will work with ANY aircraft that has a nose wheel (or a tail wheel if you want that steerable).

Here is a an example I just grabbed at random:

point.0= 1, 13.566, 0.000, -9.400, 1200, 0, 0.895, 180.000, 0.333, 2.502, 0.850, 7.000, 7.000, 0, 130.0, 145.0

1 -This number tells you what type of contact point it is (1 = wheel)

0.000 - This number tells you the wheel is on the aircraft datum line (i.e. in the middle so it must be a nose or tail wheel)

180.000 - This number is the steering angle for the wheel, 180.000 means it's a free castoring wheel (i.e. non-steerable), to make it steerable change the value to something suitable (i.e. between 25-45 degrees)

Once you have made the changes to the aircraft.cfg file save it and test the aircraft.
 
Now that's interesting I've not heard of this before so....I've just tried the 180° bit on two of my models & changing that value makes them totally non steerable. One was a tail dragger & the other a nosewheel job! (My Miles Falcon & my Meteor U16).
Keith
 
Keith,

In the model, the tail/nose wheel rotation must have been coded with c_wheel and animated 360 degrees clockwise. Then you have the option of running it castoring (180 degrees) or steerable (any other value - less than 45 works best).
 
Milton, Yes I do coder the centre wheel using C-Wheel thro 360° as well as using c_gear for compression. I experimented further today setting 90° & the aircraft steered in the opposite direction to the demanded direction! If 180° is used the aircraft will continue straight ahead even using differential brakes! I must be doing something wrong if others can use 180° with success. IIRC nearly all my models use 45° or less.
Keith

Edit: What I have also noticed is that if the tailwheel is supposed to be steerable (i.e. it is set for less than 45°) it does not rotate simultaneously with the rudder, i.e. it follows after the aircraft has started to turn.
K
 
That's true Keith. Using castoring, ensure you have teh differential braking scalar set as well as follows:

[brakes]
toe_brakes_scale = 0.640888698995941
parking_brake = 1
differential_braking_scale = 1

You can adjust the toe brakes scale and differential braking scale as necessary for proper response for your aircraft.

Keep in mind that castoring is most effective at less than 10 mph ground speed, maneuvering into position, etc., and that the tailwheel should be locked for all other ground ops, so ensure you have this statement in your contact points section:

tailwheel_lock = 1

If converted to steerable, I prefer 25-30 degrees as the tail gets too twitchy otherwise.
 
Milton, Yes have those entries already, although different values. No tailwheel lock as the aircraft didn't have one fitted. Taxy speed is always a problem & yes I agree with doing it slowly.
So I'm still a bit foxed, but thank you for spending time to try & illuminate the problem, well sort of, as the models do work OK even if strictly classified as steerable, when they really are castoring.
Keith
 
I seem to have sorted the problem in my latest model, & it does react as advertised if set to 180°, although not quite sure of the difference with my other models at the moment.
Thanks for the help Milton - see your e-mails.
Keith
 
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