This is a 1970s vintage midwest kit that I'm converting from gas, on the plans a big arrow points to the bottom of the fuse about 1/3 back from the front of the wing, manual says to balance with the wing off.
Balancing it is easy, just put a block of wood with a dowel on top under the fuse, if it's balanced it'll take a while to tip either way.
Ask me why your DX5e is doomed... and how to fix it.
They probably are giving a balance point that you would have, if you balanced the plane the "normal" way then removed the wing and checked where the fuselage would balance without the wing.
Doing it this way on some models, makes it easier to insert the battery or weight to balance, without taking the wing on and off every time you try a different position.
I have a carrying handle that bolts in place of the wing on my 63" Sig LT-25, it is marked where the body with the battery should balance. I use several different packs in this plane, so it is easier than having the wing in place.
And in case you think his instructions are strange, look at the way the manual told how to balance the Hobie Hawk.
Since this model has not been covered with monocote, but is all balsa and fiberglass, I wonder if the wing's contribution is different?
good point, anything that changes the original specifications weight wise could throw off the CG setting it with the wing off.
Both my cubs, a 40 size Hangar 9, and a 1/4 scale PA-12 balance right on the main spar. I'd say you would be safe setting it about that point. It will be flyable enough and you can tweak it from there.
President - Smoky Mountain Aero Club, Sevierville Tennessee