I tried looking at the drag equation and seeing if I could show the balloon's speed should be constant. But I kept coming up with a speed that was not...
We know ascent rate is -not- constant. See http://showcase.netins.net/web/wallio/ASCENT.html for my chaotic discussion circa 2002. It appears rising and...
Ralph Wallio, W0RPK
W0RPK@...
Apr 1, 2006 9:38 pm
2187
Hi Paul, Yeah, just doing the W = D = Cd x Ae x v^2 x d doesn't result in constant ascent rate, even letting Ae rise as 2/3 root of d. That's what prompted us...
Mike Manes
manes@...
Apr 1, 2006 11:44 pm
2188
Hi Ralph, Well, yes, there are vertical components to air currents. This was pointed out to us with abundant clarity by Dr. Cec Girz of NOAA: "Who sez the...
Mike Manes
manes@...
Apr 2, 2006 12:20 am
2189
Ok, then what causes the extreme variability in ascent rate during most flights and months(?) Note that in the June01 graphic that there were three...
Ralph Wallio, W0RPK
W0RPK@...
Apr 2, 2006 12:32 am
2190
David J. Hoffman - KE4FGW message sent from my Palm "Travis J. Maclay" <tjmaclay@...> wrote: ... y!...
Since air density drops with increasing altitude, the indicated air speed of the balloon decreases. That may influence Cd. I guess it's time to figure what...
This was just a proposal from about a year ago I doubt very much a high def version of it exists... sorry about that. To my knowledge there is no official logo...
... Zack, I can recreate a clone of that image given just a little time to learn how to drive Corel Draw software I just picked up a few days ago. That will...
Hi Ralph, Took some time to study your web page on ascent rate data from 2001 and 2002. I looked for flights that launched nearly simultaneously from the same...
Mike Manes
manes@...
Apr 3, 2006 3:17 am
2198
My brother Jeff Brown N8UEJ is a graphic artist for a TV station in Dayton, OH...he did the logo for me: _http://www.wb8elk.com_ (http://www.wb8elk.com) and...
wb8elk@...
Apr 3, 2006 3:49 am
2199
I have the raw data from dozens of Ozonesonde flights taken a week apart....the Vaisala pressure sensor used is more consistent than what you'd see for GPS...
wb8elk@...
Apr 3, 2006 3:59 am
2200
Do you mean this one? Paul ... I'm putting together a short blurb to announce GPSL 2006, but would like some logo/graphic to go with it. Zack Yahoo! Groups...
David Hoffman - KE4FGW ---------------------------- Original Message ... From: "Mike Coffey" Date: Mon, April 3, 2006 4:14 pm To: "UTARC general chat list" ......
... Paul, That's a much higher resolution version of what was previously uploaded. It should be plenty good for magazine reproduction. For the record, the...
Hi Bill, Hey, do you have specs and a source for the Vaisala baro sensor? We could use a few more really good ones for payloads and the altitude chamber. Our...
Mike Manes
manes@...
Apr 4, 2006 4:29 am
2204
I had an idea last night. I'd like to develop a barometric climb indicator. Is there a simple way to sample the voltage from a pressure sensor and hold it in...
... Paul, I'm not sure if it would be possible to do both "simple" AND reliable (under the very low temperatures that might be encountered) using linear...
Hi All... Been quietly watching this YahooGroup for a number of years now. Yesterday I saw an interesting device that might be good for some "air time", and...
It sounds like the video camera I picked up last year at GPSL after seeing HABITATS. Paul ... Hi All... Been quietly watching this YahooGroup for a number of...
Looks like a smaller form factor than the Aiptek 4-in-1/5-in-1 cameras, but around the same price (this one is $120, might be cheaper elsewhere). HABITAT has...
Hi Paul, Here's another unabashedly non-high-tech way to get a barometric pressure rate-of-change indication: Use a very sensitive DIFFERENTIAL pressure...
Mike Manes
manes@...
Apr 6, 2006 5:26 am
2211
Within the hour Taylor University will launch our BalloonSat 25 (or at least some number close to 25). This launch is in cooporation with Taylor's advanced...
I'm now taking volunteers and requests for sessions at the 2006 GPSL in Hutchinson. If you are interested in presenting, please include the following in your...
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