Aachen FVA 9 Blaue Maus II
After concentration on powered flight, a new FVA glider, designed by Hans Sander and Karl Doetsch, was completed in 1933. They designed a slight thermal glider, where not only emphasis was placed on the lowest possible rate of descent, but also good speed performance and control engineering properties. At that time the thermals aviation was still in its infancy and theories to optimize distance flights were new.
The FVA-9 is thought by the Akaflieg Aachen as a pure thermal glider with aerotow, tested on a model in a wind tunnel at Aachen. The design and the experiments were carried out in the past winter months, the construction started at the end of April. It offered no special difficulties as a result of careful design work and drawing sufficient material.
The wing has a planked nose with diagonal plywood. The body ends in a torque tube. The elevator is self-supporting and rests on a structure that grows out of the fuselage. The fittings are bent from sheet steel and welded. The operation of the rudder is done with control cables, the ailerons with bumpers and control cables.
The surfaces were produced on a slipway vertical wing building. A special jig built for the hull. When planking the use of nail strip was avoided, instead retaining straps used.
The machine was completed in mid-July and tried during the Rhön competition.