A very interesting post

Here is a very interested post about the advatages of using copper alloys fro boat propellors that recieved no response on MPB. What a shame that no one took the time to engage this obviously insightful modeler on the subject.

""Comparing to steel material, copper alloys boat propeller own its advantages which are as follow:1.With a low chemical reactivity and are not easy oxidation (especially nickel-copper alloy, which colloquially referred to white copper and it is unstainable for decades and as shining as before.)2.Cupric ion belongs to heavy metal ion and with certain toxicological effect. In seawater, algae and Shell-fish can not survive, so it is easy to clear up.3.With good machinability. In the same cutting condition, the surface accuracy which copper alloys can achieve is 2 lever higher than steel material, no*work hardening*is found, low loss to cutting tool and is easy to process. The surface accuracy always decides the noise amplitude.4.The mobility of copper alloys liquid is good, with good affinity to cool gas, it has few foundry defect like slag inclusion, with no loosen, pyrocondensation, with air holes and undercasting. Moreover, it is easy to achieve the good mechanical*tissue and complicated shape."

~agrosinic from china MPB forum~