2011/6/17 Emilian Huminiuc <emili...@gmail.com>: > On Friday 17 June 2011 08:15:36 xsaint wrote: >> Thank you Emilian and Buck.... >> >> Ok i tested changing the location of the point to ahead of the engine >> and also behind the engine, near exhaust. >> Irrespective of the location, looking at the results at the Yasim >> solver, i do not see much impact. >> >> Surprisingly i do not see any change to Drag Coef or lift ratio. >> The only slight change seems to occur rightfully at Tail incidence and >> approach elevator... >> >> Is this how it is ment to be? >> >> Cheers >> > You'll most likely see the differences in flight, in asymetric configurations.
This is incorrect. The parameter 'actionpt' is involved in the evaluation of the moment generated by the thrust. Therefore it is not surprising that it does not impact the drag and lift calculations since they result from the forces equilibrium. Changing the thrust lever arm with respect to the CG will result in a different moment around y if your airplane is symmetric with respect to the x-z plane which is very likely. The moment around y is mainly resisted by the tail even in steady flight hence the slight changes in tail incidence and approach elevator that xsaint mentions. Bertrand. ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
