>> His key point was not the 3 axes, 2 axes would usually be OK as you
>> say, but the fact that the vector sum of gravity will be 1g 
>> regardless
>> of vehicle orientation. Anything above or below 1g MUST be from 
>> other
>> sources.

> I thought that at first, but you can have other forces and still 
> have a
> 1g vector.  As an extreme example, add a 2g vector in the opposite
> direction.

That example isn't included in my solution space.
I said above or below 1g :-).

I suppose that some acceleration sources could exceed 2g, but this is 
liable to be for extremely short periods. For example, a "judder bar" 
may well do interesting things. And it seems unlikely that any really 
major ones would be horizontal. Except maybe collisions, at which 
point the system has failed to do its job and may be retired while the 
paperwork is completed.


        RM

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