The invention relates to a method of manufacturing a large-sized, thin-walled object of fiber reinforced synthetic resin using inner and outer mold parts which bound a cavity for forming the aforementioned thin-walled object, in which a reduced pressure is created in the cavity by means of at least one vent in one of the two mold parts, which vent communicates with a vacuum source, and then flowing a hardening synthetic resin into the cavity via one or more openings in at least one of the two mold parts.
Such a method is known from applicant's Dutch patent specification 178,761 and the corresponding U.S. patent specification 4,359,437.
The disadvantage of this method is that in addition to a form-retaining inner mold part, a flexible, form-retaining outer mold part is also required. This means that, for forming large objects of different dimensions, different mold parts are required.
The invention overcomes the aforementioned disadvantage.