FG-Post

Hi every body ,

I was trying to post a new thread to the "Board index ‹ FlightGear ‹ Development ‹ Aircraft ‹ Systems" at least 5 times
with no luck !
I don't know that's due to a recent forum scripts modification or there is a software bug the raw contents  of the post was

[code]
Hi all FG'ers
I hope you are all fine ,
In the process of developping the Su-27 fuel system and by reading the wiki articles and other topics
I did this :
[code]
<?xml version="1.0"?>


<system name="Fuel">
<!-- tank[1] collector tank connected to the engine fuel pump,
 tank[0], tank[2],tank[3] and tank[4] feeds the collector through valves.
Negative Gs (<-0.5g) cuts the supply to the collector tanks -->

   <property value="1">propulsion/tank[0]/collector-valve</property>
   <property value="1">propulsion/tank[2]/collector-valve</property>
   <property value="1">propulsion/tank[3]/collector-valve</property>
   <property value="1">propulsion/tank[4]/collector-valve</property>


  <channel name="Fuel pumping">

    <switch>
			<!-- Tank[0] to Collector tank[1]  -->
      <default value="-1"/>
      <test logic="OR" value="0">
        propulsion/tank[0]/collector-valve EQ 0
        propulsion/tank[0]/contents-lbs LE 0
        propulsion/tank[1]/contents-lbs GE 9170.23 <!-- 1 lb below capacity -->
        accelerations/Nz LE -0.5
      </test>
      <output>propulsion/tank[0]/external-flow-rate-pps</output>
    </switch>

    <switch>
			<!-- Tank[2] to Collector tank[1]  -->
      <default value="-1"/>
      <test logic="OR" value="0">
        propulsion/tank[2]/collector-valve EQ 0
        propulsion/tank[2]/contents-lbs LE 0
        propulsion/tank[1]/contents-lbs GE 9170.23 <!-- 1 lb below capacity -->
        accelerations/Nz LE -0.5
      </test>
      <output>propulsion/tank[2]/external-flow-rate-pps</output>
    </switch>

    <switch>
			<!-- Tank[3] to Collector tank[1]  -->
      <default value="-1"/>
      <test logic="OR" value="0">
        propulsion/tank[3]/collector-valve EQ 0
        propulsion/tank[3]/contents-lbs LE 0
        propulsion/tank[1]/contents-lbs GE 9170.23 <!-- 1 lb below capacity -->
        accelerations/Nz LE -0.5
      </test>
      <output>propulsion/tank[3]/external-flow-rate-pps</output>
    </switch>

    <switch>
			<!-- Tank[4] to Collector tank[1]  -->
      <default value="-1"/>
      <test logic="OR" value="0">
        propulsion/tank[4]/collector-valve EQ 0
        propulsion/tank[4]/contents-lbs LE 0
        propulsion/tank[1]/contents-lbs GE 9170.23 <!-- 1 lb below capacity -->
        accelerations/Nz LE -0.5
      </test>
      <output>propulsion/tank[4]/external-flow-rate-pps</output>
    </switch>

    <summer>
      <input>-propulsion/tank[0]/external-flow-rate-pps</input>
      <input>-propulsion/tank[2]/external-flow-rate-pps</input>
      <input>-propulsion/tank[3]/external-flow-rate-pps</input>
      <input>-propulsion/tank[4]/external-flow-rate-pps</input>
      <output>propulsion/tank[1]/external-flow-rate-pps</output>
    </summer>

  </channel>

</system>

[/code]

but when including it as system in the aircraft's fdm file , I see the following oputput  in the console :
[quote]
[i]Failed to tie property fcs/ to object methods
Failed to tie property fcs/ to object methods
Failed to tie property fcs/ to object methods
Failed to tie property fcs/ to object methods[/i]
[/quote]

so what's happening , I can't figure out the cause of this warning ,

and actually  :wink:  I have some other issues with this :
[b][u]One : [/u][/b]
the aircraft has the following fuel tanks config :
[img]http://i.imgur.com/WNLcAyB.jpg[/img]
with
[quote]

−tank 1 :  3180 kg (7010.70 lbs) : forward integral fuel tank
−tank  2 : 4160 kg (9171.23 lbs) : centre-section integral fuel tank
−tank  3 : 1060 kg (1168.45 lbs *2 wing tanks) : wings integral fuel tanks
−tank  4 : 1000 kg (1168.45 lbs) :Rear fuselage  tank
====> TOTAL - 9400 kg.
(that's about 12000L with an average kerosene density of 0.785kg/dm³)
[/quote]
I'm stil far from writing an accurate realistic system beacause of the complicated consumption sequence which is :
[quote]
−	45% from the tank 1.
−	empty tank 4.
−	empty tank 1.
−	15% from tank 2.
−	empty tank 3.
−	empty tank 2
[/quote]
That's of course is to keep the (well known Su-27) super-maneuvrability .
so at startup tanks should be filled equally in percentage (the same % from each tank overall capacity , I set it to 50% ).
Now the question is is this sequence implementable in FG ? (even with a spaghetti style code "I think it will be ,for sure  :D  :D ")
[b][u]Two: [/u][/b]
the fuel transfert between tanks starts immediatly as the simulation begins , I thinks with "/fdm-initialized"
so can we bind it with a property that delay it until "/engine[x]/running" for example ?
this should be more realistic and the current behaviour is totally incorrect .
so, that's it , Any help or advice is appreciated ,
Thanks in advance ,
Yanes .
[/code]

It reports an SQL error so this may be serious  :twisted:  since it [b][u]may [/u][/b]be related to the database security .
the error message page source  is :
[code]

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" dir="ltr"><head><meta http-equiv="content-type" content="text/html; charset=utf-8" /><title>General Error</title><style type="text/css">
/* <![CDATA[ */
* { margin: 0; padding: 0; } html { font-size: 100%; height: 100%; margin-bottom: 1px; background-color: #E4EDF0; } body { font-family: "Lucida Grande", Verdana, Helvetica, Arial, sans-serif; color: #536482; background: #E4EDF0; font-size: 62.5%; margin: 0; } a:link, a:active, a:visited { color: #006699; text-decoration: none; } a:hover { color: #DD6900; text-decoration: underline; } #wrap { padding: 0 20px 15px 20px; min-width: 615px; } #page-header { text-align: right; height: 40px; } #page-footer { clear: both; font-size: 1em; text-align: center; } .panel { margin: 4px 0; background-color: #FFFFFF; border: solid 1px  #A9B8C2; } #errorpage #page-header a { font-weight: bold; line-height: 6em; } #errorpage #content { padding: 10px; } #errorpage #content h1 { line-height: 1.2em; margin-bottom: 0; color: #DF075C; } #errorpage #content div { margin-top: 20px; margin-bottom: 5px; border-bottom: 1px solid #CCCCCC; padding-bottom: 5px; color: #333333; font: bold 1.2em "Lucida Grande", Arial, Helvetica, sans-serif; text-decoration: none; line-height: 120%; text-align: left; }
/* ]]> */
</style></head><body id="errorpage"><div id="wrap">	<div id="page-header">		<a href="./">Return to the index page</a>	</div>	<div id="acp">	<div class="panel">		<div id="content">			<h1>General Error</h1>			<div>SQL ERROR [ mysql4 ]<br /><br />Incorrect string value: '\xE2\x88\x92tan...' for column 'post_text' at row 1 [1366]<br /><br />An SQL error occurred while fetching this page. Please contact the <a href="mailto:flightge@flightgear.org">Board Administrator</a> if this problem persists.</div><p>Please notify the board administrator or webmaster: <a href="mailto:flightge@flightgear.org">flightge@flightgear.org</a></p>		</div>	</div>	</div>	<div id="page-footer">		Powered by <a href="https://www.phpbb.com/">phpBB</a>&reg; Forum Software &copy; phpBB Group	</div></div></body></html>
[/code]

Please Mods and Admin to test this and react ASAP ,

Regards , Yanes ,