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Old Dec 12, 2012, 07:20 AM
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United States, NM, Albuquerque
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Quote:
Originally Posted by Tmfury View Post
Yea Marco ,
Ill get there bout 10
See ya
Tom
I will be there with my living dead B2

M
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Old Dec 12, 2012, 06:15 PM
up from the skies
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United States, CO, Fort Garland
Joined Jul 2011
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Put an altimeter in Matt's cx2 and consistantly got 235'
In pry 1-3 mph lt morning breeze
Tom
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Old Dec 12, 2012, 11:25 PM
C-c-c-custom!
United States, NM, Albuquerque
Joined Nov 2011
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I'm not at all sold on the ABSOLUTE accuracy of the altimeter, but because our fuselages are the same (Tom w/ CX3, me CX2) the RELATIVE accuracy is of some importance.

I've been firmly convinced the venturi effects upon the fuselage openings at launch speed as well as the non-linearity of the altitude vs. absolute pressure relationship (abs pressure what we actually measure) lead to improper absolute altitude response, especially when starting at ABQ altitude.

An approximation of the altitude as a function of pressure response is:

alt[ft] = 145366.45*(1 - (pressure[mbar]/1013.25)^0.190284)

Tom, I'll give you an adapter to go in-line our Deans micros so we can do side-by-side. Relative accuracy will by rather high and something we can trust - the 235' is largely untrustworthy given the launch velocities and our starting altitude. But that fu**er was goin' pretty high!



-Matt
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Old Dec 13, 2012, 07:13 AM
Thermal, where art thou?
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Quote:
Originally Posted by closedloop View Post
I'm not at all sold on the ABSOLUTE accuracy of the altimeter .. I've been firmly convinced the venturi effects upon the fuselage openings at launch speed as well as the non-linearity of the altitude vs. absolute pressure relationship (abs pressure what we actually measure) lead to improper absolute altitude response, especially when starting at ABQ altitude. -Matt
Launching a DLG can create a large negative pressure spike inside the fuse, resulting in an artificially high altitude blip with a How-High or similar max alt recorder. Get a recording altimeter, i.e. RAM3, level off after peaking, and travel horizontally. Examine that trace and estimate your launch height. Even then, you can be off 10 ft. It doesn't matter how high the plane climbs, it's at which altitude you start horizontal flight. And what really matters is that you're throwing higher than anyone else around!

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Old Dec 13, 2012, 07:36 AM
usaf3kteam
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Quote:
Originally Posted by Tmfury View Post
Put an altimeter in Matt's cx2 and consistantly got 235'
In pry 1-3 mph lt morning breeze
Tom
What elevation are you flying at?
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Old Dec 13, 2012, 08:16 AM
C-c-c-custom!
United States, NM, Albuquerque
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~5K (we are cheaters )
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Old Dec 13, 2012, 09:21 AM
the icbm of pilots
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albuquerque, NM
Joined Mar 2007
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5280 at balloon park
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Old Dec 13, 2012, 09:28 AM
up from the skies
Tmfury's Avatar
United States, CO, Fort Garland
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I know nobody trust the altimeter numbers , I just posted what it said.
I'd guess the launchs were in the 170-190' range
Tom
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Old Dec 13, 2012, 09:54 AM
Thermal, where art thou?
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Quote:
Originally Posted by Tmfury View Post
I know nobody trust the altimeter numbers , I just posted what it said.
I'd guess the launchs were in the 170-190' range
Tom
Tom,

don't you New Mexicans fly balloons all the time? At least that's what your Tourism Board is telling me. Have a buddy hover at 200 ft. and launch towards him. He could even dangle a 50 ft. yardstick. Another buddy could film it all from another balloon.

New DLG event - have a quad heli hover over the field at 200 ft., gyro and GPS stabilized, and launch toward it. First one to touch wins.

Hope to see you in February - what's your backup plane?

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Old Dec 13, 2012, 09:57 AM
C-c-c-custom!
United States, NM, Albuquerque
Joined Nov 2011
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Damn it, we've done made a controversy. Tom is launching great, and we are right up there with each other. Having a blast. The launch height doesn't even matter, we had a great time. And Tom gets schooled

I'm sure we'll both be there in February to show you pesky AZians how the gliders are supposed to be flown. One of these days...we'll figure it out....hopefully before Feb.
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Last edited by closedloop; Dec 13, 2012 at 10:08 AM. Reason: Bavarian Charles
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Old Dec 13, 2012, 05:22 PM
the icbm of pilots
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albuquerque, NM
Joined Mar 2007
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Jeff and I will be there
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Old Dec 13, 2012, 05:37 PM
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United States, NM, Albuquerque
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Skyler,

are you gonna be at the shop tomorrow? Bring the damaged Polaris. I can stop by and pick it up
Marco
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Old Dec 13, 2012, 09:05 PM
hass-alfed and bass-ackwards
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United States, AZ, Chandler
Joined Jun 2008
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Looks like the weather is gonna be kinda crappy all weekend, so I won't be coming to NM.
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Old Dec 13, 2012, 09:11 PM
up from the skies
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United States, CO, Fort Garland
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Well shoot
Catch ya next time bro
Tom
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Old Dec 13, 2012, 10:22 PM
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To all you New Mexicans (you know who you are!):

Are we on for the 28th? And where?

The Dona Ana Crowd wants to know.

Yours, Greg
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