Thread Tools
Old Dec 12, 2012, 08:20 AM
VirTus is online now
Find More Posts by VirTus
Registered User
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
Sign up now
to remove ads between posts
Old Dec 12, 2012, 07:15 PM
Tmfury is offline
Find More Posts by Tmfury
up from the skies
Tmfury's Avatar
Put an altimeter in Matt's cx2 and consistantly got 235'
In pry 1-3 mph lt morning breeze
Tom
Old Dec 13, 2012, 12:25 AM
closedloop is offline
Find More Posts by closedloop
Fiddy Killa Voltz
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
Old Dec 13, 2012, 08:13 AM
BavarianCharles is online now
Find More Posts by BavarianCharles
Follow me to sink!
BavarianCharles's Avatar
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!

RCG Plus Member
Old Dec 13, 2012, 08:36 AM
rcgeorge is online now
Find More Posts by rcgeorge
usaf3kteam
rcgeorge's Avatar
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?
Old Dec 13, 2012, 09:16 AM
closedloop is offline
Find More Posts by closedloop
Fiddy Killa Voltz
~5K (we are cheaters )
Old Dec 13, 2012, 10:21 AM
skylerraver is offline
Find More Posts by skylerraver
the icbm of pilots
skylerraver's Avatar
5280 at balloon park
Old Dec 13, 2012, 10:28 AM
Tmfury is offline
Find More Posts by Tmfury
up from the skies
Tmfury's Avatar
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
Old Dec 13, 2012, 10:54 AM
BavarianCharles is online now
Find More Posts by BavarianCharles
Follow me to sink!
BavarianCharles's Avatar
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?

RCG Plus Member
Old Dec 13, 2012, 10:57 AM
closedloop is offline
Find More Posts by closedloop
Fiddy Killa Voltz
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.
Last edited by closedloop; Dec 13, 2012 at 11:08 AM. Reason: Bavarian Charles
Old Dec 13, 2012, 06:22 PM
skylerraver is offline
Find More Posts by skylerraver
the icbm of pilots
skylerraver's Avatar
Jeff and I will be there
Old Dec 13, 2012, 06:37 PM
VirTus is online now
Find More Posts by VirTus
Registered User
Skyler,

are you gonna be at the shop tomorrow? Bring the damaged Polaris. I can stop by and pick it up
Marco
Old Dec 13, 2012, 10:05 PM
carlsoti is offline
Find More Posts by carlsoti
hass-alfed and bass-ackwards
carlsoti's Avatar
Looks like the weather is gonna be kinda crappy all weekend, so I won't be coming to NM.
Old Dec 13, 2012, 10:11 PM
Tmfury is offline
Find More Posts by Tmfury
up from the skies
Tmfury's Avatar
Well shoot
Catch ya next time bro
Tom
Old Dec 13, 2012, 11:22 PM
glidermang is online now
Find More Posts by glidermang
Registered User
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


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Utah DLG happenings... like.2.fly Hand Launch 26433 Yesterday 08:26 PM
Discussion Colorado DLG Happenings... djensen Hand Launch 10666 Dec 02, 2016 09:01 AM
Discussion Idaho DLG Happenings LostVisual Hand Launch 316 May 26, 2014 09:02 AM
Discussion Los Angeles / Orange Co. DLG Happenings MattN Hand Launch 27 Dec 10, 2010 07:57 PM
Discussion Inland Empire- CA DLG Happenings jcats Hand Launch 13 Dec 02, 2010 02:51 PM