Small recorders

F-35 shown obsolete on previous posts

   Accidents involving small private planes are investigated but they do not have flight recorders like commercial aircraft.  This makes the work of the accident investigators much more difficult.
    A simple improvement would be to have a recorder about the size of a pack of playing cards attached to the plane's dashboard.  It would have an ambient microphone to record conversation and general aircraft noises and three axis motion and rotation measurements/
   It should cost only a few hundred dollars if built into s new plane and maybe a few thousand dollars to retrofit existing aircraft.  It can be built much more simply than commercial aircraft recorders because the enery of ground collision is much less.  The total fuel heating from fire would also be less and frequently small planes crash without burning.  It could have a lithium battery to record after engine failure.  The cost would be low because it would have no connections to the aircraft controls.  This limits the amount of information gathered, but it would atill be a major improvement for accident investigators over currently having nothing.