RE: Sig Citabria
Troy,
I have 2 Mag 52's and 1 Mag 70, all 4 strokes. At present, only 1 52 is in a plane, specifically the GP Cherokee 40. It has very little run time on it as the plane was recently built and flown. Having said that, the engine is running very well and seems to be a good match for the Cherokee and IMO will be a good fit for the Citabria. Although, if you are into serious airbatic maneuvers, the 70 might be a better choice.
One other minor change I made in building was replacing the stock tail wheel with the Sullivan.
I think you'll find the "Something Extra" to be a much easier build. It's a modern design and laser cut, whereas the Citabria is somewhat dated. It is definitely a builder's kit, but it's a good flyer and well worth the effort. We'll see this spring.
DaveB