RE: super skybolt engine size
OK, people, take a look at the two pictures above. The one in post #15 by 150flyer shows the Skybolt ARF. The one in post #16 by joesabido shows a very different Skybolt.
The "different" Skybolt has polished metal gear that looks to be quite a bit longer than the Great Planes Skybolt ARF's gear. That 2nd Skybolt also has bent wire cabane struts that are soldered together, and the interplane struts do not have the ARF's screw connections.
We're obviously talking about two different airplanes when the topic is ground clearance.