Keep in mind that all the instruments we used for those
velocity measurements have some interesting limitations at
this point. The pressure altimeter is known not to work so
well in the transsonic region. The z-axis IMU hasn't yet
been calibrated terribly effectively. The GPS is quite
inaccurate
Hi all,
One slightly dispassionate observer out here thinks that transonic is
feasible for this one, but probably not supersonic.
mach 1 is 335 m/s measured at sea level at 59 deg. F. The speed goes
down as as elevation, altitude, humidity and air temperatures increase.
(Lower air density.)
I guess my thought is that sound, at least as heard from our respective
locations, isn't a good indicator. I had a good feel for the sound delay
from the kids' rockets, and I heard the engine sound and then the two
"booms". I think I have a pretty good feel for when in flight the sound
occured, a
Given your experience, the youth of TM's software and
hardware, and the prediction of supersonic flight by the
simulator, I'm willing to believe we may well have been
supersonic or at least transsonic on Saturday. However, it
will be really hard to tell, I think. We might be able to
cal some stuf
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
On Mon, 2009-06-01 at 17:06 -0700, Andrew Greenberg wrote:
> That was the motor chuffing, we think. Keith, can you give us the column
> names and units for your gnumeric file? I'd like to post it as cvs.
he colums in the spreadsheet are:
A: time (seconds)
B: height above ground (m from baro sens
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 wh
That was the motor chuffing, we think. Keith, can you give us the column
names and units for your gnumeric file? I'd like to post it as cvs.
Thanks,
Andrew
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 sep
