Originally Posted by
serious power
Hi Joe,
The tail stats,, and efficiency that one enters do change the CG result it produces.
However all I was saying is that most people refer to their cg as a % of MAC or an actual distance. That tool requires you to enter a static margin figure to work.
So using your own data you have to use 25% for the static margin (which is overly forward/stable) to get the 167mm result.
167 is 33% of MAC which isn't exactly a forward setting.
I'm not saying the tool is wrong, it just looks from a perspective not normally referred to. It could add to the confusion that all this jargon sometimes causes.
Brian
Hey Brian,
The CG that the tool gives does change, but MAC does not. I don't know where all the numbers come from so I'm not using anything from those tools except MAC right now, and I still have to look at things to make sure I trust what it says and where it's measuring from.
The description pages say the 5-15% static margin should end up around where the MAC is. The static margin is not a location back from the LE, it's a distance forward from another calculated point, behind the MAC.
Note that the MAC is given at the center of the fuse, and the root chord length it is asking for is measured there also. My measurement was at the side of the fuse so I have to redo it.
But I think we are on the same page
