Hi,
I'm currently working on a project that will measure the G force model aircraft are put through...something similar to what you guys has already come up because by using accelerometers (rather than gyros) you can gain attitude and positional information...we would of used this to provide full stats on what the aircraft was doing (i believe its called inertial navigation).
I'm not going that far with this project due to time/funding constraints but its worth a thought.
Happy roboflying!!