Engines of this type powered the original series 90 Monocoupes designed by Don Luscombe and built by the Mono Aircraft Corp.  Monocoupe 90s were manufactured from 1930-40 with various engines, but the Lambert engines were only used on the Monocoupe.  When Monocoupe production ceased so did the Lambert engine.

Engine NameLambert Model R-266
Manufactured byLambert Aircraft
Serial #3185
Cylinder ConfigurationRadial
Number of Cylinders5