On Fri, 2003-10-24 at 16:33, Michael Wallis wrote:
> Well ... the way to make 5 engines work is the original POGO
> configuration with one central engine (that just has an on/off relay)
> and 4 outer engines that have throttle control. This allows you to
> maintain a reasonable thrust level even when using differential
> throttling to control your flight.
The required throttle differentials for control in reasonable wind
speeds are so low that I really don't see how this is a serious concern.
> And the failure modes are much
> nicer too:
>
> - center fails
> - land on 4 outers
If you have a controllable remote dump or just get lucky.
> - an outer fails
> - turn off the opposite outer and land on 3 engines
That is such an obvious crock that I can't believe anyone in ERPS ever
thought it workable.
> That ability to keep a reasonable thrust level even in an engine out
> situation has a lot of merit.
In the general case, yes. In the specific case of POGO, it's not worth
a whole lot. It's very hard to imagine a failure scenario that affects
only one of the POGO's engines -- most of the loss of thrust scenarios
will kill all of the engines.
-p
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