On Fri, 2003-10-24 at 15:21, David Weinshenker wrote:
> Pierce Nichols wrote:
> > I think it's only a problem for arrangements with small numbers of
> > engines. If you have more engines, you should be able to be clever about
> > it. I don't know what the magic number is, but I have hunches. One thing
> > that came out of my reasoning that is interesting is that the problem
> > goes away if the engines are on the same plane as the Cg.
>
> Well, it _almost_ goes away for engines in the CG plane...
It goes all the way away -- take a look at the math. BTB, I made an
error -- the cross-coupling term is zsin(a), not rzsin(a).
> I think
> there would still be a slight lateral force, but not the yaw/pitch
> torque that would occur with base-mounted engines.
I don't see how -- please explain.
> (A ring of 8 engines, with 2 oppositely-canted units at
> each "corner", would allow roll control to be much more
> independent of yaw-pitch operations.)
I'm working on the math right now. I can't exactly do that kind of
symbolic vector algebra in my head :). I think it's probably in the
right ballpark. The minimum number has to be divisible by four, at any
rate.
-p
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