Re: Contra-rotating props in YASim

On Friday 10 December 2004 22:22, Andy Ross wrote:
> Lee Elliott wrote:
> > Will there be any benefit in specifying both props in each
> > contra pair?  Will it even work effectively?
>
> Yes, it will work.  Under normal circumstances, the aircraft
> will be symmetric due to the multiple engines anyway, so you
> won't notice a difference.  But engine-out performance will be
> different between a (missing) single prop on one side and the
> loss of a contrarotating pair.
>
> > If I do include both sets of props in each pair I think I'll
> > have to specify a separate turbine engine for each one and
> > if this is so, can I simply 'halve' each engine i.e. halve
> > the power etc?
>
> Yes.  Although then the two engines will have differing state
> -- it would be possible to "stop" one and not the other, which
> is nonsensical.
>
> Maybe the simplest way to handle this in code would be to add
> a new boolean to a propeller, called "contra-pair" or whatnot,
> which indicates to YASim that the propeller is a
> couter-rotating pair.  The moment of inertia would still be
> used to compute rotational acceleration, but would be ignored
> as a component of the internal gyro vector of the aircraft. 
> This would be very easy.
>
> Andy


Dear Santa,

I've tried to be really good all year so what I would like for 
Xmas is a little change to YASim.  Apparently it would be very 
easy to do...

:)

LeeE

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