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I don't have any statistical information on Time Between Failures, but if you look at it from an engineering view point, the fuselage wooden members would all be in compression and wood can take compression loads pretty well. There is also the same bracing in the wings and one can find that same technique in homebuilt aircraft. Another thing to consider is WWI aircraft were not expected to have any longevity. They probably were build simple, quick & light just to get as many out there, and stressing performance while trading durability.
Jan
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