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Recent Posts

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1
Bridge Command General Support / Re: ARPA
« Last post by elir71 on March 26, 2020, 04:33:16 PM »
just to point out, real radars do have a time delay which you can set and rates of turn etc as they are often very significant in confined waters
2
Bridge Command General Support / Re: Linux Fedora 31 Successful Install
« Last post by elir71 on March 26, 2020, 04:30:36 PM »
sudo dnf install automake
sudo dnf install libtool
autoreconf -vfi
su
./configure && make && make install

still no joy
3
Bridge Command General Support / Re: Linux Fedora 31 Successful Install
« Last post by elir71 on March 26, 2020, 02:17:17 PM »
Ive gone into bc/libs/enet

$ autoreconf -vfi

autoreconf: 'configure.ac' or 'configure.in' is required

4
Bridge Command General Support / Re: Linux Fedora 31 Successful Install
« Last post by elir71 on March 26, 2020, 08:43:01 AM »
Trying to compile 5.4.5 this morning following errors

In file included from Network.cpp:17
Network.hpp:23:10: fatal error: enetzenet.h: No such file or directory
23 |  #include <enet\enet.h>
compilation terminated

similar for calls from NetworkPrimary and NetworkSecondary
5
Bridge Command General Support / Re: Boat.ini configuration
« Last post by CaIIIeR on March 20, 2020, 04:46:04 PM »
Hello,

Thank you for your reply, it does make sense and is more clear to me right now. Yes, an excel sheet would be really useful, thank you.

Best regards.
6
Bridge Command General Support / Re: Boat.ini configuration
« Last post by forum_admin on March 13, 2020, 09:38:55 PM »
In terms of an approach to this, I'd approach it in the following way, although there is a certain amount of guessing/estimation involved:

You should be able to find out the 'Max_propulsion_force' of the vessel, ie the maximum thrust developed by the propellors in Newtons. Either you can find this directly, or if you know the power, and the maximum speed, then the thrust must be (power[W]/speed[m/s]). Remember that 'Max_propulsion_force' is for a single engine.

When you know this, you also know that the total drag must equal the maximum propulsion force (from both engines if relevant) when the ship's at it's maximum speed.

If you want, it might be simplest to start assuming that all drag is proportional to the square of the speed (i.e. the DynamicsSpeedA term), and set the DynamicsSpeedB to zero. This allows you to say:

Total thrust [N] = DynamicsSpeedA * Maximum speed[m/s]^2, or

DynamicsSpeedA = Total thrust [N] / (Maximum speed[m/s]^2)

In reality, the total drag will be a combination of the 'A' and 'B' type, so you can adjust the A and B terms, so you still ensure that

Total thrust [N] = DynamicsSpeedA * Maximum speed[m/s]^2 + DynamicsSpeedB * Maximum speed[m/s]

Does this make sense? I have an excel sheet somewhere that might help, if that would be useful.

For the other terms, the same sort of approach applies. I would normally set the inertia from the known value (the polar moment of inertia about the ship's yaw axis), and then adjust the Rudder A and B terms to give a realistic start of turning motion (Rudder A sets the turning effect proportional to the ship speed, independent of the engine, so in an extreme example, would apply to a paddle steamer. Rudder B uses the engine speed, so accounts for the wash over the rudder from the propellor, which can turn the ship even if it is stationary). I'd then adjust the DynamicsTurnDrag terms to ensure that the steady rate of turn is reasonable for the rudder angle.

The lateral drag terms are used to account for side slip of the ship, and should be quite a bit higher than the normal drag terms.
7
Bridge Command General Support / Boat.ini configuration
« Last post by CaIIIeR on March 09, 2020, 12:14:14 PM »
Hello,

Right now I am studying the BC project and its source code and I am having some issues with understanding the boat.ini configuration. More precisely, DynamicsSpeedA and DynamicsSpeedB, DynamicsTurnDragA, DynamicsTurnDragB, DynamicsLateralDragA, DynamicsLateralDragB, RudderA, RudderB. I understand that they are used in calculations of maxSpeed, drag, acceleration etc. but where do the initial values come from? For instance, in the example at https://www.bridgecommand.co.uk/Doc/newmodels.php#own I can see that the initial values of  DynamicsSpeedA and DynamicsSpeedB, defined in the boat.ini, are 180000 and 12000 respectively. Where do these values come from? If I want to define my own boat model, where should I look for these values, what characteristics of a real vessel do they correspond to?

Thanks in advance, have a nice day
8
Scenarios / Re: Deleting Ships From a Scenario
« Last post by forum_admin on February 19, 2020, 04:09:22 PM »
Hi, I've added the option to delete ships, and this will be included in the next release. If you want this sooner, you can download the executable bridgecommand-ed.exe and the language file languageController-en.txt from https://github.com/bridgecommand/bc

I've increased the allowed zoom level, which has been included in the latest windows release (5.4.4). Let me know if this works better for you.
9
Models / Re: models file formats for irrlicht
« Last post by forum_admin on February 15, 2020, 09:11:18 PM »
Hi, you can also use .3ds and quite a few others. See http://irrlicht.sourceforge.net/docu/classirr_1_1scene_1_1_i_scene_manager.html#a63894c3f3d46cfc385116f1705935e03
10
Models / models file formats for irrlicht
« Last post by elir71 on February 15, 2020, 06:21:04 PM »
is it only .x files that are acceptable as model file format or are there others ? 
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