Hey Scott, looks like after all my test stand work with my fuel system the 16 oz Hays tank will be closeto beingover the CG.
Getting my fuel system into the plane was another issue, since working in such a confined and tight space, so to make my life easier I used the existing tank as a locator for the header tank wrapped in foam with hard lines going the main tank. Take a look at all the pics, I think can you see what I ended up doing. I have installed this in both birds since it worked so well for me.
By the way I have been keeping track of weight, it has been a juggle back and forth, lighten here add weight here, Ha ha Lol, but consistent fuel delivery is important.
EDIT, The servos were put on a diet in the NovaRossi Dirty Birdy to save some more weight.
Scott, I’m still working out my fuel system on the Test stand, but aiming to put the 16 oz close to the CG if possible with my setup.