For newbies following this, the post immediately above is about proportions, not balance directly. If we look at the proportions of the two models, the AeroWorks Yak has 16.5" of fuselage in front of it's main spar. It would then have 37.5" of fuselage and tail sticking aft. So it'd have about 2.27 more tail than nose. Since most straight wing models have their CGs on the main spar (or close enough for gummit work), we're going to go ahead and compare that 2.27 to whatever we can assume from the model with the "long tail".

That model has an 18.5" nose and is 71" long overall. 71 - 18.5 = 52.5 so we're going to say that model's proportions are 18.5 : 52.5 or thereabouts. That's around 2.8 isn't it.

If we want to use the numbers from the long tail model and the ratio from the AW Yak to get an idea how short we could go on the long tail, we'd multiply the 2.27 ratio number from the AW to the nose length of the long tail. 2.27 x 18.5 = ~42"

The long tail could be shortened to as short as 42" and it should fly as steady as the AW Yak. From 52" to 42" is significant, so yeah, it really does have a long tail.