I have decided that I will use tubing diagonals supporting the lower longerons. I weighed and evaluated many options here and then just said to myself, I can do the tubing in the one bay that is really wobbly today rather than waiting a few years till I will be doing the composite work. So once I made the decision, ½hr later two tubes were fitted and partially welded in. The structure was then stable enough to carry up stairs back into the living room.
Looks like I have not posted any updates here in the month. Back in early December I installed the mounts for the brake master cylinders as well as the lower doublers for the structure going up to the front spar. I had also more recently built the longerons back another bay to where the rear float mounts should the plane be setup for seaplane use.
Here is a general shot of the forward lower fuselage prior to the most recent work session,
followed with a master cylinder hung in place as well as showing the lower engine mount pivot.
This shot is where the vertical tube in front of the doors will eventually go.
The non pivoting engine mounting points utilize a 3/8 bolt through a sleeve, the sleeve is located to the fuselage over the mount points.
Hard to get a good shot of small tubing with this cluttered background. At this time the lower longerons are in 3 subsections that have slip joints allowing the moving and jigging on the weld table.
The aft section has most of it's brace tubes in place.
Off to the starboard side of the rear section is the cabin top structure as well as automotive wire harnesses that get used in the custom driveline swaps I do.
The front section of this structure is where the 3 sections separate such that I can not install diagonal bracing yet.