We are building a German designed ULF-1 micolift sailplane and have been doing weight comparisons between the metric size spruce indicated on the plans in whole mm and the nearest sizes available in inches here in the US. In most cases we must select sizes slightly larger in inches. This could produce a serious weight penalty for the finished aircraft. Does anyone know a source of metric sized spruce here in the US, or a company that will mill in mm??
Many thanks, Holliday Obrecht