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I’m trying to understand what drives the maximum firewall forward weight. Since the Engine is cantilevered, I am assuming that one component is simply the stress on the engine mount. If this is the case, then an airframe max g could be derated. Another factor is elevator control authority. This...

I was reading through the Zenith construction standards and there was a mention of the need to remove all cutting marks as they may be stress risers. That makes sense to me. I wouldn't consider extrusion surfaces to be smooth. They often have lines that show the direction of extrusion. Do these...

I've been told that not properly deburring can lead to decreased fatigue life in a bolt hole. I'm trying to go through the mental exercise of how burrs affect the fatigue life on a joint. Haven't found a good explanation yet on the internet. I understand how a crack that is cyclically loaded may...

Hello All, I've got an An3 bolt with an nylock nut that I was attempting to tighten on some metal parts. For some reason, I couldn't achieve the appropriate tension. When I tried to remove, I noticed the nut would spin, but not descend down the thread. Yes, I held the bolt stationary. I'm...

Looking to purchase some prebent 0.032" and 0.025" 6061 Aluminum C channel. It seems like it would be a common thing, but can't seem to find a source. I tried Aircraft spruce, Wicks, but no luck. Thanks!

Hello All, I'm the proud owner of a new Sonex. Unfortunately, there are some issues with the previous owner's work. In a few instances, he redrilled holes next to others and near edges, seriously compromising the structural integrity of the piece (in this case, horizontal stabilizer spar)...

Hi All, I'm looking to build a truss structure from fiberglass tubes. I haven't seen a lot on how to join pieces together. Most of the stuff I have seen is about extending a tube using an insert. In Solidworks, one can miter a joint to make them fit well together. My current thoughts is to do...

We've started putting together a RV-12 kit, which has match drill holes that we drill to final size. When we assemble pieces together, we sometime note slight misalignments that doesn't hinder a cleco going in, but prevents a pop rivet from fitting in the hole. We've been taking a drill bit and...