RE: Nitro Planes CMP P28 Piper Arrow ARF
One simple fix...
On one particular plane I had assembled the plane and flown it.
The elevator was not removable after assembly as it was glued in place.
I did not feel like damaging the already built plane but I felt that the elevator needed additional re-inforcement.
So I cut a small hole, large enough to feed a CF rod through, at the root of the elevator all the way through the fuselage, positioned to permit a CF rod to sit parallel and resting on the elevator bottom.
I installed the CF tube temporarily and cut off a bit of covering to provide adhesion to the underlying wood.
I then put epoxy on the exposed wood and slid the CF rod into place.
The CF rod was about 60-70% of the entire elevator length and sat on the bottom side.
If you looked closely at the plane you would see the re-inforcement rod, but most people never noticed.
This worked great and I still fly this particular plane with the rod in place.
The photos you uploaded are a bit drastic IMHO... I get the same effect with the rod far more simply.