Building The Istruts

Today we started building the I Struts. But before we get to that I have a few pictures of the fuel tank in the frame.

Fuel Tank in the Frame

Fuel Tank in the Frame

We laid out the I strut diagram on the table and welded in some round tube pieces that held the I Strut tubes in place for welding. We then Bent the lower square tubing to the upper and lower wing profiles. These are the pieces of the I Struts that bolt to the wing spars.

I Strut Location

Streamlined Tubing in the I Strut Jig, Lower Tubes Bent

Here is a pic after we welded the Streamlined tubing to the 3/4 inch square tubes. The I Struts keep the wingtips apart and form the rectangular box, along with the wings, of the biplane which is very strong.

Lower Square Tube Welded to Streamlined Tubes

Next we welded in the 3/4 inch tube braces.

Starting to Fit the Support Braces

Braces Welded Up

3 Braces Welded

Next, because the Streamlined tubing is wider than the 3/4s of an inch brace tubes, we needed to heat and flatten that area of the streamlined tubing to 3/4s of an inch. Below Dave is heating the area and the last picture he is using the slap hammer to flatten that area.

Applying Heat to Flatten Streamlined Tube to 3/4

Using The Slap Hammer to to Flatten Streamlined Tube to 3/4


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