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JSBSim Engines: Difference between revisions
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=== Starting the engine === | |||
In a [[YASim]] aircraft you need to simulate the spool-up of the engine in a [[Nasal]] script. For an example see lines 498-529 of [{{fgaddon aircraft url|b1900d|Nasal/systems.nas|l=498}} systems.nas] from the [[B1900d]]. | |||
JSBSim however spools the engine up automatically when certain conditions are met. According to my experience the process is the following: | |||
# The [[property]] <code>/engines/engine[~n~]/cutoff</code> has to be <b>true</b>. | |||
# Set the property <code>/controls/electric/engine[~n~]generator</code> to <b>true</b>. | |||
# Set the property <code>/controls/engines/engine[~n~]/starter</code> to <b>true</b> as well. | |||
# As result, <code>/engines/engine[~n~]/starter</code> and <code>/engines/engine[~n~]/starting</code> will be set to <b>true</b> and <code>/engines/engine[~n~]/n1</code> will increase which means that the engine is spooling up. In JSBSim <code>n1</code> represents the rotation speed of the turbine shaft which is significantly higher than the propeller speed. | |||
# <code>/engines/engine[~n~]/n1</code> stabilizes at a specific value which is defined in <code><startern1></code> in the engine definition file of the FDM (see the table above or as an example the [{{fgaddon aircraft url|b1900d|Engines/PT6A67D.xml|l=11}} engine file] of the B1900d). | |||
# When <code>/engines/engine[~n~]/n1</code> rises above <b>15</b> (at least I think), you can set <code>/engines/engine[~n~]/cutoff</code> to <b>false</b> which simulates that the engine now gets supplied with fuel. | |||
# This sets <code>/engines/engine[~n~]/starting</code> to <b>false</b> and <code>/engines/engine[~n~]/cranking</code> to <b>true</b>. | |||
# Now you may set <code>/engines/engine[~n~]/starter</code> to <b>false</b> without interrupting the starting process. | |||
# <code>/engines/engine[~n~]/n1</code> will increase further until it stabilizes at the value which is defined in <code>idlen1</code> in the [{{fgaddon aircraft url|b1900d|Engines/PT6A67D.xml|l=5}} engine definition file]. | |||
# Finally <code>/engines/engine[~n~]/cranking</code> will be set to <b>false</b> and <code>/engines/engine[~n~]/running</code> to <b>true</b> which means that the engine is now running. | |||
Pleas note that the above described process is only an assumption based on my experiences with trying to create a JSBSim FDM for the [[Twin Otter]] which is equipped with turboprop engines, and unfortunately I cannot guarantee the correctness. If something is wrong here feel free to correct it. | |||
: [[User:Dg-505|Dg-505]] ([[User talk:Dg-505|talk]]) 13:53, 5 December 2016 (EST) | |||
== FGRocket == | == FGRocket == | ||