[balloon-makers] iffy lift calculations?

Paul Vincent Craven paul at cravenfamily.com
Sun Apr 1 19:37:40 CDT 2001


Finally got a chance to look at it. Not to bad!

> -----Original Message-----
> From: balloon-makers-owner at mail.deering.org
> [mailto:balloon-makers-owner at mail.deering.org]On Behalf Of Tom Deering
> Sent: Friday, March 30, 2001 11:38 AM
> To: balloon-makers at deering.org
> Subject: Re: [balloon-makers] iffy lift calculations?
> 
> 
> 
> 
> >Your total system weight of 150 pounds indicates that you are looking at
> >FAR Part 103.
> 
> Yes, I am shooting for ultralight, but it was accidental that I hit 
> exactly 150 lbs.  That's just the weight the spreadsheet spit out for 
> that size envelope.  It calculates everything except the fuel, based 
> on the envelope size.  I sized the envelope to maximize the 45" 
> fabric, not to FAR 104.  I just put a new version up at 
> http://www.deering.org/balloon
> 
> (Interesting FAR 103 stuff snipped)
> 
> >To answer your other question, how much lift beyond equilibrium do you
> >need, ten percent will give you your maximum rate of climb or close to
> >it.  A little extra volume goes a long way for the extra weight of
> >fabric.
> 
> So ten percent of 350 is 35 lbs. I have almost twice that.  I should 
> be okay, then?
> 
> Hoo boy.  We're getting close.
> 
> Whee!
> 
> Tom
> 
> ---
> tmd at deering.org    http://www.deering.org
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