Re: Tri-Q finish weight and balance estimate [1 Attachment]

Paul Fisher

Very impressive Jay!  I assume you are not planning to put any paint on the canopy, not that you might not get some accidentally!!  I did the final battery install after mine was painted.  That let me fine tune the CG.  I look forward to seeing your plane flying in 2016!!

Good luck!


On Dec 28, 2015 10:23 AM, "jay@... [Q-LIST]" <Q-LIST@...> wrote:

Hi All,

I have been noodling out some final weight and balance estimates for my Tri-Q. The biggest unknown remaining for me is the finish/paint and just where the cg of this is located. I am still a bit up in the air on what will be the total weight of the finish, but I am estimating about 30 pounds for the time being. I built a 3D virtual computer model of the outer skin of my plane (actually only the right half, since both halves are symmetrical), then fitted it with uniformly thick layer of small cubes covering the skin (these cubes are called voxels is the modeling lingo--picture below). This allowed me to compute the cg for a uniformly thick layer of finish. That computation works out to be located at FS 69.7, for what that is worth. I am sure uniform thickness is not a perfect assumption, but at least I have a starting point for adding paint to my overall cg computation. Comments welcome.

Hope you all have a great 2016. I know it will be memorable for me if I get my bird in the air this year.

Jay Scheevel, Tri-Q, still building

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