Jason,

The Fox .35 is an old design (almost 60 years) with a few updates. It is a maximum size engine in a minimum size case. Because of design and materials used, you should use a minimum of 25% (preferably 29%) all-castor lube. It will best with 5%-10% nitro.

It is also known for vibrating a lot. Whatever mount you use, make it sturdy. VERY FEW control line flyers use radial mounts. I do not know of ANY kits for a .35 that have radial mounts. The motor mounts (engine bearers) are included in a kit, and plans show the mounting method. If you scratch build, I would suggest you use "standard" mounting practice such as hardwood sandwiched between plywood doublers on a profile or hardwood epoxied to plywood doublers on a full fuselage model.

Good luck with your Fox .35. Many, many have been flown.

George