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OK, i get that the balloons are sampling pressure at various altitueds. How is the altitude of the balloon when the pressure is sampled determined?GPS or radio location. The other NCR Ken works for the company that makes those now,…   Read more»

OK, i get that the balloons are sampling pressure at various altitueds. How is the altitude of the balloon when the pressure is sampled determined?

I just took a quick look at today’s balloon sounding data for Denver and Grand Junction, and the 5 points I looked throughout the air column at had between 0 and 1.4% difference.Temperature, dew point, and wind direction vary more…   Read more»

How can you reconcile that data from over 100 miles away is accurate? Last week the Denver metro area got snow and at my house in Fort Collins we didn’t get any. Do you mean to tell me that I…   Read more»

We could go on for a while on this topic, but it should probably be moved to its own thread.In the meantime, my position is that it’s possible to use a test chamber to evaluate how accurately an altimeter measures…   Read more»

Agreed – on my 17k flight for example, my two baro altimeters (not the same model though) were 1200 feet off of each other (one read 17,002, one read 15,800). The GPS on board (Garmin Astro) showed 17250 feet as…   Read more»

Word is TRA records committee will not be accepting any altitude records over 25K without GPS including the full raw stream data capture. Baro or Accel derieved altitudes will not be accepted.WarrenThat’s true now (though I think the cutoff is…   Read more»

I agree with you Adrian. I’m waiting for them to come up with certification standards for altimeters – when they do, I’m putting money down that yours returns more accurate altitudes.Warren

Word is TRA records committee will not be accepting any altitude records over 25K without GPS including the full raw stream data capture. Baro or Accel derieved altitudes will not be accepted.WarrenThat’s true now (though I think the cutoff is…   Read more»

Word is TRA records committee will not be accepting any altitude records over 25K without GPS including the full raw stream data capture. Baro or Accel derieved altitudes will not be accepted.Warren

What about GPS altitude for the higher ones?

TRA or NAR approved contest altimeter

This could take along time…Tony

Yes, it would be an interesting contest where we might all learn something from others attempts – via the web postings and/or forums. A limited buy-in keeps it in the interest of all, and if CTI were interested in supporting…   Read more»

NOW we’re talkin’! That’d be a fun contest…

Highest altitude, one shot, 6 grain 75mm CTI motor.$1 to enter and the winner takes the pot. Can be flown anywhere in the US in 2010. Must have photos of the construction / design / flight posted on the net…   Read more»

Sweet deal! Thanks! I’m starting the design process on my L3 now – its based on a Mongoose 98 minimum diameter and would prefer to fly it on the M3400 over the M2505 if possible… could you send me the…   Read more»

Any chance we can get a higher waiver for MHM ’10? …. say 50k? I’m designing the Mongoose 98 for my L3 but also for the 98 6GXL – and since we had a successful staging on our recent trip…   Read more»

To run a good contest, raise the entry and we’ll probably need some sort of recovery rules and/or time limits from lift off to flight line return. Gee, now I need to build another rocket.

It looks like we have our new contest – the USSS – Uber Single Shot Sweepstakes.Highest altitude, one shot, 6 grain 75mm CTI motor.$1 to enter and the winner takes the pot. Can be flown anywhere in the US in…   Read more»

I to am very interested in the ‘bang for the buck’ that 75mm gives you in terms of altitude. I also love the long burns. I guess what I’m saying is that if CTI had a moon burner, or big…   Read more»