My Vertigo II is a 60 size pattern plane. The fg fuse has hardwood beams glued in as for a side-mount two-stroke, and not a lot of room for improvising. Trying to set up a four-stroke throttle linkage, for instance, or putting an engine mount on the firewall, looks like more trouble than it's worth. So I will be thinking of a two-stroke of the .72-.75 displacement range. Or I might go classic and put an HB61 in there. I have three of them, one is old stock new in box, and I will probably never have a more appropriate plane to put it in.

I don't know the Farnworth Elroy Cure Air. I presume it's a cousin of the Curare. I would think a Saito 100 ought to go well with a 60 size pattern model, but that's just on general principles. I do like my Saitos. If you don't already own it and are going to buy, I'd be more inclined to buy a YS (91 or 110 if you crave power). With the integral fuel pump and tank installed at CG you have consistent pitch trim throughout the whole flight. With my non-pumped models, if I fly too long, I know it's time to land when the model starts getting squirrely; I have to really concentrate to get it down in one piece.