On Thu, 1 Aug 2002, Michael Wallis wrote:
> > I wonder if you are thinking of the early engine cutoff of the second
> > Ariane 5 flight...
>
> No, he's thinking of the first Pegasus XL flight that was designed
> completely in CFD CAD (ie no testing) and had a roll issue on first
> flight.
It wasn't a roll problem, that I recall, and in any case the fix wasn't a
hardware change. The aerodynamic model used to design the autopilot
software was simply wrong, due to faulty assumptions and inadequate
verification (no wind-tunnel tests).
Henry Spencer
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