Seems odd to me. I had to add weight to the front of mine. Also, my battery was in the front under the fuel tank (if memory serves). AND I had replaced half of the firewall which added even more weight to the front. I had an os 46LA on mine with a plastic spinner and a
master airscrew prop. Mine sure was tail heavy for some reason. Got a lot of great flights out of that plane till my friend cracked it up. Bummer... Sure took a pounding though