Well, the purists will shout me down, but I'll offer that they do make a side-by-side Sonerai. - VW powered - Side-by-side seating - Stall speed: A bit slower than a Sonerai - Cruise speed: A bit slower than Sonerai (I see about 130 MPH in mine--VW 2180 power) - Wing span: 22 feet (Sonerai II Stretch: 18' 8" feet) So, all the folks that wanted a few more feet of span--here it is. - Wing Area: 98 sq ft (Sonerai II Stretch: 84 sq ft) All the folks that wanted a sightly slower stall speed--here's how they did it with no sophisticated high-lift tricks - Wing Loading at factory MTOW: 11.22 lbs/sft (Sonerai II-S: 13.7 lbs/sft) The comparison is a bit tongue-in-cheek. The Sonerai-II S has a lighter empty weight (about 100 lbs less even for a light Sonex) and performs like it when flown solo. The planes are quite different (especially the construction). The Sonerai II-S also has more useful load than a Sonex that uses the factory recommended 1100 lbs MTOW (for VW powered planes). But if you want a plane that is economical to operate, fun to fling about the sky solo, and which can be pressed into service for traveling with two aboard--side-by-side, you could do much worse than a Sonex. But build light.