Ya know--it would probably fly fine with a .46 engine.

I just have no experience running glow engines at lower altitude. I'm not sure where your at. I've never flown below 5000' elevation and glow engines need to be upgraded about 20% or 25% in power if you want decent power.

Worse thing--your not happy with the 46. You can always dremel out the mounting rails a bit and then mount a little wider engine in the plane. There's probably a 50 or maybe a 60 size engine with almost the same footprint as your 46FX.

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The Sig Fazor is a lot of fun to fly. It would be very well powered with the 46FX. It's easy to build. Same basic building principal. Balsa fuse with a lite ply doubler and stick built tail surfaces. It's a little cheaper to buy the kit too.

If you want a REALLY nice profile biplane--look at Ohio Models Boxxer bipe. It's more of a 3D plane, but you don't have to dial in all the throws.