The 1927 Advance 125 or Siemens Waco (ATC 26) sold for $5,300. About 30 were built, of which one was refitted 97hp Siemens SH-12 in 1928.
Engine: 125hp Ryan-Siemens SH-14
Wingspan: 30’7″
Length: 23’9″
Usefulload: 730 lb
Max speed: 112 mph
Cruise speed: 96 mph
Stall: 37 mph
Range: 350-400 mi
Seats: 3
All Aero 