Post by thread:Re: (OT) Air pressure sensor for HG vario (+ other

(From the original poster) > 2. For free-fall parachuting - you just passed 3,000' (2,000', whatever) > going too fast - BEEP! pull now! Too fast in the sense of 120MPH, rather than under a nice billowing canopy. These are used in addition to an 'analogue' alti, and common sense (blimey, the big green thing below me is getting awfully big). Skydivers also often use a barometrically operated device which senses rate of change of altitude, and triggers a small explosive charge, if necessary, to deploy the reserve at a given height. Many saves have been credited to these devices, (called 'Cypress') where skydivers become forgetful, or are knocked unconscious. I wouldn't jump without one. > 3. I have a friend into model rockets - how high do they get? I was thinking that, assuming we could find the 'remains' of the rocket, I could plug a cable in, press a button, and the onboard pic could send it's recorded info to an LCD. Real-time telemetry would seem like overkill! Please keep the ideas coming! John M