[aprssig] TransAtlantic Balloon on 28 MHz (signal)
rudy at ve3bdr.com
Thu Feb 23 16:36:39 CST 2012
I did not see the decimal point. Now it makes sense.
From: Bob Bruninga
Sent: Thursday, February 23, 2012 5:34 PM
To: 'TAPR APRS Mailing List'
Subject: Re: [aprssig] TransAtlantic Balloon on 28 MHz (signal)
>> ...Air-to-Helium (10-to-1) and
>> air-to-H2 (10-to.5) so the difference in lifting capacity is
>> only 0.5 out of 10 or about 5%. Now it makes sense.
> This hurts my brain. It sure looks like 10:1 vs 20:1...
> Time to revisit buoyancy class.
Yep, that's why I posted it. All my life I never understood it till now...
It’s the displaced air side of the equation that matters. Nine units vs 9.5
units is only about 5% Better.
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