Building Tips and technical articles. > 1/2 A building.

#2 wood screws

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Paul Smith:
Another good approach for children's trainers is dispense with threaded fasteners and use rubber bands.  Put dowels in place of the bolts and provide an anchor rod behind the engine mount.

A broken gum band can cut your losses.

944_Jim:
Mr. Paul,

I'll remember this one!

Thanks much.

Ken Culbertson:

--- Quote from: Paul Smith on April 23, 2024, 08:17:48 AM ---Another good approach for children's trainers is dispense with threaded fasteners and use rubber bands.  Put dowels in place of the bolts and provide an anchor rod behind the engine mount.

A broken gum band can cut your losses.

--- End quote ---
From the looks of the glow plug fins it worked.  #^

Dan McEntee:
  I would be afraid of the dowels breaking off, and if you made them out of metal then breaking the ears off the back plate. Some one is making new ones from aluminum now but why break it if you don't have to. The zinc castings that the back plates on Cox engines can get pretty brittle with age. Two plywood fire walls, like used on the Goldberg Wizard, with one built into the fuselage and the engine attached with number 2 screws to the other, then rubber bands hold the two together works extremely well. All the engines mounted on the TuffBaby trainers used at Oshkosh have been crashed more times than most can imagine and we never broke a firewall or broke anything on an engine.
  Type at you later,
  Dan McEntee

Dave Nyce:
Definitely yes! We use #2 x 3/8" long, pan head, slotted, stainless steel sheet metal screws for mounting a Cox Bee type engine to the Skyray plywood firewall.
On some other models, we may use same screw, but a 1/2" long, when mounting landing gear and the gear wire is not inlaid into the firewall. (To accomodate the greater depth that includes the gear wire diameter.)

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