What a sweet little project! Not that the project itself is little, just the plane, relatively speaking.

Looks like they probably wanted twin .25 2-stroke glows originally. 9" is about all the prop you can fit between the nacelle and the fuselage, right? That's going to be the limiting factor.

The question here is, will the Eflite Power25 be putting out enough usable power with an 8x6 Master Paintstick 3-blader, or do we need something hotter? I'm asking myself the same question with regards to my Hobby Hangar OV-10 that's been sitting idle for the last two years.

Nah, it's recommending an 11" prop.... We need something hotter, like an AXi 2820/8. They show a 9x7 prop on 3S LiPoly for a hotliner. An 8x6 3-blader should be a good fit.