The IAM had concluded a contract with the Federal Aircraft Factory which developed a deltawinged jetfighter at the time for the Swiss army, to solve this problem.
	It lead to a system of 106 linear equations. At the end of the common article by Hestenes and Stiefel it is mentioned as the largest problem solved by the cg-method so far and that the computations had been realized on the Zuse computer at ETHZ (with a sufficiently accurate answer obtained in 90 iterations). This machine had only a mechanical memory for 64 numbers with 6 digits so the corresponding matrix and vectors had to be stored externally by punching holes in old movie films. These had to be mounted on and removed from the reading units as the computation advanced so there was a constant interaction between man and machine.