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Meaning that a propeller hit with a .30 round would go into millions of pieces ?
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That's not the case. I read an account about Sholto Douglas (of later WWII Battle of Britain fame) flying Sopwith 1 1/2 Strutters in ground attack missions in the battle of Vimy Ridge in 1917. It mentions that sometimes the interrupter gear would fail and they would fire the Vickers MG anyway, resulting in pierced and chipped propellers in returning aircraft
Apparently due to propeller construction method, that seems to have been done in all cases the laminated way, (instead of being carved out of a solid block of wood), the occasional bullet would just punch a neat hole through the propeller without compromising structural integrity.
It must have been a calculated risk and not as foolhardy as it seems, since many pilots did it and came back to base to tell the tale.
In the case of those Bristols of the RNAS, the Lewis gun must have been wing mounted and (possibly) at an slight angle to clear barely the prop disc, its advantages justifying the occasional stray bullet hitting the prop
It seems that a propeller had more to fear from hitting a rock (or the ground) in the airfield than from bullets. A bullet would simply punch a neat hole through the layered strips of wood, a impact against a rock or the ground might cause longitudinal cracks, that's my understanding from reading a couple accident reports. Maybe that was in some British propellers you see them with metal guards riveted over the tips and leading edges, but that's just my theory. I hope somebody can confirm this.
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Hope this helps.