Terrence, are you talking about the "Oklahoma Twister" which looked a lot like the Bigiron or the "Super Twister" which was an Elliptical wing design?-- either way, neither of those two was as good as the Bigiron.---- Now the "Phantasy" was another thing!1 It was far superior to thwe Bigiron, but for me, too hard to build.
As engines became larger and more powerful, I simply enlarged the Bigiron to take care of the added weight and still called them the Bigirons--- even when I changed from twin booms to a "box boom" fuselage .
A couple of years back, I took the "percolator down off the wall and with a ST G-21/35, put is a couple of 100+ MPH flights.
Bigiron