This is a remix of @xcorwin's excellent Sopwith Camel model https://www.thingiverse.com/thing:2979886, but I can't add it to his project as a remix because he has "No Derivatives" in his license.
The parts here are all to the same scale as his model, and my Fuse-Z attaches to his Fuse-Y correctly.
NB that these parts are probably unusable for an RC model; the elevators, tailplane, and rudder all print out as solid and consequently are quite heavy. Fuse-Z is modelled as a solid, and needs some infill.
This is a W-I-P... so far I've only published the empennage, but I'm also remixing the front of the fuselage, mainly to allow incorporation of a Clerget 9B engine model. Probably I'll also need to remix the wings, for the same reason as the tailplanes.
The main motivation for this remix was that I'm printing a scaled-down (83% of his) model, and the tailplane and elevators don't print... the internal structure "bleeds through" the skin and leaves holes. Also his model has recesses in the Fuse-Z and a hole in the rudder for (I assume) RC servos and linkages. And I wanted to print a "wooden" tailskid. Along the way, I discovered some Sopwith empennage plans, and his are slightly different. Whilst there, I added control horns to the elevators and rudder.
Edit 8 May 2019: After looking at a real Sopwith Camel, I now see that the curved turtledeck from behind the cockpit only extends as far as the front of the tailplane, so Fuse-Z and the fin will need to be redone.
Chinese cheapo PLA, but any material should be OK
White and "Army Green"
Print rudder and elevators standing on their hinge edge. Print tailplane standing on inboard edge, rudder on bottom edge, Fuse-Z on front face. Elevators are symmetric, so just print two the same.
The square alignment holes that match to Fuse-Y are really too close to the edge of Fuse-Z if you print this scaled down as I did. After I printed this, I realised that the holes could be moved inboard by a couple of mm, and matching "offset" pins printed to align with the original Fuse-Y. If someone intends to print this scaled down, I recommend they do a remix incorporating this.