Metropolitan - Vickers Electrical Co. Ltd Engineering Report No. D.102. Report by F.R. Harris and W. Vernon of the Gas Turbine Engineering Department on Windage Tests on a 3 Stage Turbine. The report compares measured windage losses in a G2 turbine (with vortex flow blading), with those predicted by various known formulae; investigates the casing temperatures reached under test conditions. Engineering Report No. D.102. by F.R. Harris and W. Vernon of the Gas Turbine Engineering on Windage Tests on a 3 Stage Turbine.