Repair method for lengthening turbine blades

A method for producing a support form arrangement for lengthening a turbine blade, comprising the following steps:

• (a) arranging a flexible sheet metal strip with at least an overlapping portion thereof against an upper blade contour of an upper end portion of said turbine blade;
• (b) pressing said sheet metal strip against said blade contour using an upper lamellar diaphragm;
• (c) sealing a lower lamellar diaphragm in a closely contour-fitting manner against a lower blade contour of a lower portion of said turbine blade, so as to form a closed space between said upper and lower lamellar diaphragms;
• and
• (d) injecting a synthetic material into said closed space so as to press said overlapping portion of said sheet metal strip against said upper blade contour and to enclose and surround a portion of said blade between said upper and lower diaphragms with said synthetic material.