Re: 2 Vs 4 engines - CFM56 Engineering Dept Costs

Date:         31 Mar 2000 22:25:41 
From:         Ron Parsons <>
References:   1 2 3 4 5
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In article <airliners.2000.114@ohare.Chicago.COM>, Richard Cochran
<> wrote:

>As the probability of loss-of-thrust gets smaller and smaller, those
>squares and cubes get very very tiny, and it's hard to keep the
>uncontained failure probability low enough to pay off.  For any given
>set of failure probabilities, there is an optimum number of engines,
>and adding more engines hurts safety.

In light planes, people have gone on and on for years trying to explain
why the fatal accidents from twins are higher than those for singles. I
suspect they don't wish to look at your math.