25 years of flying for a living, and wrenching on my own for fun
Wood rote, aluminum corrodes, good maintenance helps all, bad vise versa
First plane I flew had wood wings, it still flying just fine
I wrenched for a living and was also a flight instructor for a few years. When you deal with many airplanes, not just one or two, you start seeing some shocking stuff. There is a LOT of bad maintenance out there.
I had an engine failure in a glider tug. The carburetor fell off. It was on a Gipsy Major in an Auster, and the carb is a downdraft affair that sits on top of the intake manifold alongside the engine. No lockwiring on the bolts, and they rattled out until the throttle linkage (actual linkage, not a cable) tipped it off the manifold, with one almost-out bolt holding it cocked, when I closed the throttle to descend back to the airport. Deadsticked it in. Same airplane broke a tailwheel bolt. Corrosion. The left forward MLG bolt lost its head, again due to corrosion. Bolt was backing out when I spotted it.
I had another engine failure in a Champ. The crankshaft broke, probably as a result of a long-ago propstrike. They used to just "dial" the crank flange and see if it was still pretty straight, and figured that was good enough. Now we know that cranks can twist and bend quite a bit during a propstrike, then spring back, but a crack has started that takes many more hours to bust the crank. Deadsticked that one in, too.
I quit flying the glider tug. Lousy maintenance by the club. The following year it quit on another pilot shortly after takeoff and was damaged in the forced landing. I bought it and started restoring it, and found that there was damage unrelated to the forced landing, damage incurred when a windstorm broke it free and banged it into a hangar a few years before, and more damage that happened when another windstorm flipped it onto its back. The aft spar in the right wing was cracked 3/4 of the way through the strut attach area. Wooden spar. That was from landing on its back. Five of the eight drag/antidrag wires were broken in the same wing, from whacking the wingtip into the hangar. And I had been flying the airplane with that broken spar and brace wires.
I ferried a 172. When we took it apart for inspection, we found 134 serious snags. Among them were missing nuts on the lower strut bolts under the floor. Horizontal stab spar broken all the way through. Cracks in many other places including fuselage bulkheads. The rudder was displaced forward, bending the hinges and spars. Backed into something. Patches in the aluminum skins made of galvanized sheet steel. (Seriously.) The hole in the belly for the ADF antenna cable looking like it had been cut with an axe. Many points where cracks could start. Every control system was far out of rig. That airplane could have come apart anytime. It was another classic case of an owner doing his own wrenching, with a friendly mechanic signing it off.
And it had just had an annual! Ignorance kills. I have encountered similar stupid stuff in other owner-maintained airplanes.
You should know now that old airplanes are not to be trusted without thorough, really thorough, inspections. Like I also said earlier, I have watched too many owners get financially hosed by the lethal defects that show up on the first inspection after purchase. Just because some airplane you know that has wooden wings is still flying, doesn't mean that they're
all OK. That's the mistake too many people make. There are pristine old airplanes and there are exactly the same models in the junkyard, trashed because they were beyond repair. The difference is in how seriously the owners take the maintenance.
When I restored my Jodel, the wooden airplane, I found mildew and rot under the fabric. Found broken glue joints. Found rot around rusted steel attach bolts. Like I said earlier, a wooden airframe, or any wooden component, has to be kept dry and has to be carefully monitored at annuals. I've had too many close calls to be a casual inspector. And I've seen WAY too much bad stuff to be fooled by nice paint and interior anymore.