Originally Posted by
Dave S
Rene,
Just a few thoughts
2X seems to be the industry standard for edge distance, also reflected in FAA documents, usually with respect to rivets. I think that can be agreed on, although there are some lesser amounts that have been used as you indicated.
One point to consider is the over-reach does not affect the lower tab, just the upper tab.
Another consideration is that normally where three edges (through a 180 degree arc) are considered, there is little reason to have any of the three edges wider than the least of the three - like the sides compared to the end of the tab - the closest edge is the weakest link anyway. If the sides are less than 2X, simply radiusing the tab to agree might be an answer.
Others with a more extensive engineering background and kitfox experience might be able to provide a stress analysis and determine if the part would perform ok with a little addittional material removed, beyond the 2X factor.
Any doubts, I would call up Kitfox, I have always found they are the experts on design and tolerances of the aircraft.