ORIGINAL: Deadeye
Really? I'm not sure I understand how the CG can shift, when the LG is anchored to the same point?
The LG on these planes do not retract inward toward the fuselage like on the P-51 Mustang. Instead, they rotate and retract rearward into the wing.
Attached are three pictures showing the side view and bottom view of the F6F Hellcat. The side view shows where the wheels are when they are down. The bottom view shows where the wheels are when they are retracted. As you can see, when the wheels are down, they are in front of the CG. When the wheels are up, they are behind the CG.