Most of the way through the mechanical build

I probably put ~12 hours into building so far. I work slowly, agonizing over every bit of the instructions. Here’s a run down of what I’ve done.

Tail assembly

The instruction start you off with the tail assembly. Right off the bat, they want you to somehow apply CA glue to the outside of the bearing without getting any inside the bearing. I hate doing that! Very paranoid that I’m going to destroy the bearing and have to wait a week until I get another one. Luckily it seemed to be okay.

My tiny work station (a glass TV table with an Align work towel over it) got real busy real fast.

The pieces were so tiny that I started using a standard-sized staple to apply thread locker! Unfortunately this caused me to not apply enough… I needed to go back and re-apply more.

During the assembly I was impressed by the quality of all the parts and how well they fit together. Certainly better than the Horizon Hobby/Blade products I’m used to. However, there were three parts (out of many) that seemed a bit substandard in either execution or design.

  • One end of the tail pitch slider seemed to be chewed up somehow, as if they crimping process or whatever they do isn’t gentle enough on the delicate metal and plastic.
  • The 3d-printed front tail boom insert (designed to prevent the boom from crushing) looked extremely unfinished. I needed to use a hobby knife to trim away the excess before it would fit. Others have stated this as well, so it’s not just me.
  • The tail belt tensioner bushing that’s near the tail fin isn’t centered relative to the belt. Now, this tensioner isn’t symmetric, and if I were to turn it around 180 degrees (left to right in the pic), it would become more centered, and some of the geometry of the supporting posts would make more sense. But the instructions very clearly state to put it this way, so whatever.

I should mention that I don’t expect any of the issues I mentioned to actually affect how the OXY 2 will fly.

The tail assembly overall took a long time. But I’m quite satisfied with the end result. Looks great!

Main frame assembly

Compared to the tail, the main frame assembly was a piece of cake. Not too much to report here, other than it’s convenient to know what electronics you’ll be using.

  • If you wait to add the motor later, you’ll have to do a tiny bit of disassembly to get the motor mount out. Not too much, but some.
  • The OXY 2 supports two sized of motors. Which one you choose will affect where the lower bearing block gets attached to the frame. Choose wrong, and you’ll have to do a fair bit of disassembly.

If you don’t know your choices, it’s not too big of a deal. Anyway, here are some photos of the main frame assembly.

Assessing and improving

I should mention that around this time I wasn’t happy with some friction I felt in the tail pitch slider as it slid along the tail shaft. After troubleshooting, the issue seemed to be some type of rough spot on the tail shaft. I disassembled, wiped it down (I had previously put a ton of grease on it to try to fix the problem), then reassembled it. For some reason that fixed the issue, so I’m happy now.

This was also the time that I noticed how little thread locker I was using. I went back and re-tightened all bolts.

Head assembly

The head assembly went smoothly. There are relatively few parts, so that helps.

I had two minor issues during this phase:
(1) I din’t realize initially that the thrust bearings that get seated into the main grips needed to be pushed down farther than I had initially. Took some muscle to do that! I would not want to try to get them out.
(2) I found it very scary and difficult to thread lock the two bolts onto the ends of the spindle (feathering) shaft. Too easy to accidentally get some on the thrust bearings. I believe mine is okay. Whew.

Next steps: Start installing electronics

The instructions require me to install the ESC next. This involves some soldering and deciding what battery connector I eventually want.

As I said above, I’ve probably put in 12 hours of work so far. Even though the helicopter mechanics are well over half done, the electronics installations are going to take quite a long time.

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