Cg & all

[t j]

I calculate 3kg on the tail wheel will bring the empty CG back to 319 mm (12.5 in.). That sounds good to me.

When people were putting Subaru engines in model 4's I remember some reports of empty CG arms in front of the forward CG limit. Of course they would sweep wings forward and install the battery on the tail to get the loaded plane within CG limits.