Nice catch on a superb set of scales, Matt.

Good idea about the epoxy ratios! I hadn't thought of that before because I never had scales that could do it. Figured that estimating the size of the blobs was how everybody does it. Even if the resin and hardener densities are slightly different, it's still going to be very close to perfect in the small amounts we mix.

Concerning the Xoar e-props for the SAP-180 hybrid prop mod, I got two 18x12s in the mail yesterday, as well as a couple of APCs. One of the Xoars weighs 49.7g and the other 45.2g, with the APC 18.1x12 at 124.4g and the 17x12W at 132.1g. Clearly, the modified props (even if they weigh 60g) are going to make a significant difference in rotating mass.

If there isn't anything similar commercially available by the time the weather warms up and I can work out on the deck, I'll have the materials assembled to make them.