• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

    • Tag FS2020 specific questions with the MSFS2020 tag.
    • Questions about making 3D assets can be posted in the 3D asset design forum. Either post them in the subforum of the modelling tool you use or in the general forum if they are general.
    • Questions about aircraft design can be posted in the Aircraft design forum
    • Questions about airport design can be posted in the FS2020 airport design forum. Once airport development tools have been updated for FS2020 you can post tool speciifc questions in the subforums of those tools as well of course.
    • Questions about terrain design can be posted in the FS2020 terrain design forum.
    • Questions about SimConnect can be posted in the SimConnect forum.

    Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.

    By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.

Bristol F2B Turn While Taxiing Problem

R

Ramjett53

Messages
223
Country
us-idaho
First off, I apologize if this is the incorrect place to post this, but I don't know where this question would be better posed.

One of the Virtual Airlines I belong to is going to have an event commerating the end of hostilities in "The Great War", World War I. We are going to do a fly-in/fly-over with vintage WWI aircraft. I have found working models, with virtual cockpits for FS2004, FSX, and some that say they will work in P3D; a Fokker DRI, a Fokker DVII, an Albatross DIII, a Pfalz DIIIA, a Sopwith Camel, a Vought VE-7, a Spad, and a Bristol F2B. I have been testing these in FSX SP2. Several had taxiing problems since the majority used skids and not tail wheels, but I have fixed them slowly one by one.

The Bristol F2B is giving me fits, though. No matter what changes I make to the aircraft.cfg file she will only taxi in a straight line, so you have to slew to the runway to takeoff. I have checked to make sure there is no tail_wheel_lock parameter set to "1". Of all the aircraft, this one did have a rudimentary braking system, so I have tried setting differential braking. The contact point for the tail skid has the number 8 position set to 60 degrees, so she should turn...but she doesn't.

I downloaded her from Simviation here, https://simviation.com/1/search?submit=1&keywords=F2BPROJ.zip&x=22&y=11

Any ideas on what I have done wrong...or what the modeler did wrong?

Randy
 
Ramjett53 said:
First off, I apologize if this is the incorrect place to post this, but I don't know where this question would be better posed.
Click to expand...

Avsim, Flightsim, Simviation, Sim-Outhouse...honestly, the way your're asking puts this a bit too much in the "product support" domain, something which absolutely do not want in a developer forum. We don't really want to look under other aircraft's cowlings other than out own.

The modeler has absolutely nothing to do with the flight dynamics.

Here's the contact point reference. The issue has to be in there somewhere.
https://msdn.microsoft.com/en-us/library/cc526949.aspx#mozTocId836373
 
You are absolutely correct, Bjoern. My apologies. I did post this identical query over at AVSIM to get more "visibility" for my question. I'll follow any replies over there. Please forgive me.

Randy
 
It wasn't meant personally, but I'd rather break out the hammer sooner than later (to discourage others to follow the samer example) to avoid getting flooded with inquiries about commercial products that none of us owns.

And I did point out the SDK document. Use it as a reference to sanity check the contact points.
 
I knew that, and completely understood and agreed. No worries. I did check the contact points. Although I appreciate the link to the SDK ESP I have had that as a "Bookmark" for years, but thank you.

Yes, I did look at the contact points. That's how I knew parameter position 8 was set to 60 degrees. Here is the full contact point entry...

point.0 = 3, -13.1, 0, -3.17, 1200, 0,0, 60, 0.2, 2.5, 0.7, 0, 0, 0, 0, 0
Click to expand...

"3" at PP1 means it's a skid, not a wheel. The zero at PP 6 means no brakes and the one at PP7 is zero because it's a skid with no diameter (although I did try changing it to a wheel with a 6 inch diameter to no avail). PP8 we know and the rest are really not relevant in my mind to the issue, but who knows. My mind sometimes leads me astray. Let's see what happens over at AVSIM.

Randy
 
A tail skid provides some measure of directional stability when taxying on grass, but no steering. To steer you have to use rudder and a blast of prop thrust.
Roy
 
You can also implement differential braking by rudder to make things easier.
 
I solved it by cheating...somewhat... Roy's method worked, albeit the turns were rather "large" by that method. I simply renamed the tail skid contact point to a wheel with a diameter of 6" and she turns on a dime now with rudder deflection, even though in sim the "wheel" looks remarkably like a skid... ;) I had tried the "wheel" method before...as noted above...but only in giving the "skid" a diameter, not actually changing PP1 from "3" to "1".

All is good in Vintage-ville. Thanks for all the advice and help. This can be closed and locked by a moderator if you choose...or deleted entirely since it is really a wandering outside the intent of FSDeveloper.

Randy
 
Deleting the thread would also delete my very educational rant about product support.

Glab you solved it.
 
You must log in or register to reply here.
Back
Top