This paper studied the manufacture of the FRP rudder skin.The permeability test and resin gel test of glass fiber fabric were carried out;the filling process of composite rudder surface was simulated by PAM-RTM software.The central point injection,central line injection,single side injection and multi-thread relay injection were discussed,the simulation results show that,the multi-thread relay injection scheme can satisfy the requirement of filling the mold in the resin using time,and achieve 100％filling rate.The prototype of composite rudder was fabricated by multi-thread relay injection.The actual filling time was about 10％different from the theoretical calculation.
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