estebanana -> RE: Crack in new student Navarro blanca (Dec. 1 2020 3:36:33)
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Cracking in extreme weather changes is going to happen whether the guitar is in the case or not in the case. If you are down at 30% RH yep they can crack even if they are built at 40% RH. It takes about 10 or 15 minutes for the wood in the guitar to go from one extreme to the other, and across the grain spruce tops can expand and contract up to a 1/4"! Cypress backs expand a contract a bit less. Guitars crossing from Spain to North America on airplanes also experience radical temperature and RH changes. The luggage stowage bays get drier than the cabin, and the cabin pressure and air is drier then normal. Aircraft are really dry, the baggage compartment is temperature controlled, but not like the cabin. At 30,000 feet over Greenland the baggage compartment can get low RH. I've heard flying over Newfoundland is the worst for guitars. Tell the pilot to go off the beacon and reroute to a lower latitude, actually flying the plane without autopilot might stimulate them..... crack, wipe it, don't smoke it....
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