On Friday 17 June 2011 07:17:45 xsaint wrote:
> Hello Folks...
> 
> Was wondering if any nice souls will assist clear this doubt on mine...
> 
> In YASIM, what does "actionpt" really refers to?
> Is it the point the engines pull the air through? which the point will
> be ahead of the engines or
> is it the point at back the end of the engine where the exhaust takes
> place?
> 
> OR
> 
> Do we have different application for "actionpt" based on the aircraft we
> are modeling. For example,
> if it is a passenger jet, the actionpt is ahead of the engines  and if
> it is a military jet, then the actionpt is behind the nozzle?
> 
> Thank you all for the clarifications
> cheers
> 

It should be the point of force application, which for a jet engine is the 
exhaust nozzle end, commonly found aft of the engine center of mass.
For a prop, it should be the blade/hub linkage, and thus commonly found ahead 
of the engine center of mass.
HTH
Emilian

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