Well that's just it; I was at the road-station two miles away and I never heard the engine sound. All I heard were two cracks about ?15? seconds after launch. Would I have heard a chuff sound if I never heard the engine sound? Just curious.

Glenn

I wrote:



That was the motor chuffing, we think.

Yeah, I don't think it's possible to hear a sonic boom if you can already hear the engine (though the chuff sound was impressive). My understanding is that a sonic 'boom' comes from the fact that you hear no sound, then all of the sound at once when the shock arrives at your location.



Glenn LeBrasseur wrote:
Is the speed measurement a little off? I am sure I heard a sonic boom.
In fact I thought I heard two cracks seperated by about 1/2 second?

Glenn

Glenn LeBrasseur,  KJ7SU
gle...@twaves.org



Quoting Keith Packard <kei...@keithp.com>:

Here's the data I captured from the on-board telemetrum data log.

The graph is a bit messy as it has so many lines.

Here's some numbers too:

Max height above ground: 3864m (baro)
Max speed:                308m/s (baro) 286m/s (accel)
Max accel:                120m/s² (accel)
Time to apogee:            28.2s

--
keith.pack...@intel.com




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