No Jenki, not a split lock washer, these are belleville washers. Nested stack increases the pressure available, inverted stack increases the range of operation. Nested and inverted increase both. They are not designed to be tightened down flat. Do an internet search on them. https://www.mcmaster.com/belleville-disc-springs P.S. I missed that others had already answered... had an image added too but it didn't make it.
In the first post you state .006 - .007" deep but your picture indicates .069" - that's a major difference and a number of responses are not valid if that is indeed the case. Hard to tell from the pics on my computer.
I understand the reason is due to the rake(?) angle. More material and more complicated bending necessary to make it. Looking at it closely, as in thinking how one would go about fabricating it, I can see that.
Welcome to the group! If you're talking tail dragger, take a closer look at the configurations of the Kitfox 5 gear vs. Avid Mark IV. You'll see that the KF gear uses the extra mounts more forward located, coming straight down. Avid gear is angled forward to get the wheels far enough ahead. Some fuselage mods might be necessary to use the KF gear if that's the case, although here's a pic that appears someone using KF mounted a bit further forward than Avid style mounts ( I don't know what kind of plane it's on). Added 2nd pic that I recall may have been a cub variant, but similar idea. I'll make another post with some more mount ideas. I'm faced with making mounts for my 2nd hand MkIV Avid gear as well.
John, When occasions arise that the battery has drained a bit, how many amperes is it initially charging at and how long before it is under 10 amperes? I'm concerned about earlier Jabiru charging limitations. Which model EarthX are you running? Guessing your Jab has the newer charging system.
How flexible are you (able to bend over, lift legs up, etc. comfortably) and what size feet? The answers to these questions are significant. There are some folks bigger than you that are fine and some smaller that are not.