> How much is the acceleration? 4G? 6G? This much could be > achieved in a Formula 1 car in the bending, so how would you > do that in there? I don't know anything about the micros in F1 cars but they do have their electrical problems. Whether any of those are due to crystals failing under G forces, possibly not The effect is probably negligible and unimportant in most apps but it's worth knowing about http://www.mwrf.com/Articles/Index.cfm?Ad=1&ArticleID=8990 Acceleration in a rocket might not affect the crystal too badly, even if timing was somewhat affected, but the decceleration when the rocket (or whatever the device is) lands might break it -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist