Rocket computer

What kind of electronics are small enough to fit into a small hobby model rocket vehicle? Long and skinny, to fit in those rocket tubes.

• Altus Metrum has open hardware and software designs for high powered model rocketry avionics solutions, such as the TeleMetrum altimeter with integrated telemetry link.
• "Taniwha Flight Computer" by Paul Campbell: "the DAC is no longer easily available - we need to lay out a new board for a more modern part"
• "Small Altimeter for Model Rockets" by Herve Cousin
• rocket timer (found via rocket timer) (uses TC4422 "9 A mosfet driver" to power the igniter; but first uses the PIC16F84 to delay the right time ... what are the *other* connectors on the board for?)
• "A miniature 2 meter beacon for rocketry and balloons" by KB0VVQ; "beacon"; "... The tricky bit is running the PIC off the same oscillator. ..."
• "Beeping" Tracking Transmitter Kit
• directional antenna for inexpensive pocket radios

DavidCary is designing a "small rocket computer" that can fit inside an off-the-shelf small model rocket, rather than requiring a "high powered model rocket". One that is as narrow as a 13 mm "mini engine", narrower than a 14 mm AA battery, much less a 18 mm "standard engine".

ideas:

• accelerometer to log the accelerations during flight.
• pressure sensor to measure barometric altitude
• beeper to help find it
• ...
• What other electronics would be useful to put into a small hobby model rocket?
• ...

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