oh, think I got it now with rossettes and fishmouths :-))


"Brian Whatcott" schrieb im Newsbeitrag
...
rattlesnake wrote:
Peter, Brian,

thanks for the bright thoughts. Think I know what caused the problem. Per
the plans my engine requires about 1.5" long spacers between the mount's
attach points and the engine itself. This creates an extra bending moment
which may have triggered the failure.

The mount is made of 3/4" 4130 tube with 0.035" wall thickness.

My current idea of repair is to weld a short round bar into the remaining
tube and so rebuilding the attach points. Maybe I'll shorten the spacers
a bit and bring some ballast further forward instead (battery).


See if you can find some tube that will fit inside or outside the failed
tube. perhaps 50 thou wall. fish mouth the ends. Rossette and end weld.
Take a look at CAM18. It gives specific instructions on repairing tubes.

Brian W