Sunday, June 2, 2019

A bent eyebolt from load testing.

I found another bent bolt from the load test:

This is the right wing's leading edge outer strut attachment eyebolt.  The eyebolt is loaded on a weird angle, rather than a traditional tension direction, which definitely explains why its head is bent over.  Yes, the symmetric left wing has the same bent bolt.  It has been almost two years since the load test and I'm just now finding this.

Excellent that the bolt bent, instead of a brittle failure.  This means it is possible to inspect for over-loading conditions.  My plan is to replace this eyebolt with the next size up, because seeing it bent over that much is frankly terrifying.

I'm something of a fair weather builder when it comes to Goat.  The garage isn't the most pleasant work location in the sweltering summer humidity in Washington, DC, and it can get quite cold here for extended periods of time too.  That leaves a window of opportunity during the spring and fall.  It just so happens to be tolerably nice outside right now ... and I'm trying to mentally find a hobby outside of work projects right now too.

The leading edge shells are going on smoothly.  This shot was the next five with a few left to go.  The missing hole closest to the camera needs that bent eyebolt replaced.

At the wing root, since I switched from the cable-braced wing design to the strut-braced design, the upper angle bracket that mounts the root airfoil can be trimmed back a bit.  The sharpie line is where I ended up cutting that bracket, with associated radiused corners to round it out.  The edge will eventually get taped before covering anyway.
 

That's really all there is to update.  Only took two years...  One bolt at a time though!

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