> Tracy Crook wrote:
>
> >
> >  
> >
> >     The FBW RX-8 throttle body controller design is done and the
> >     inevitable 'feature creep' has begun.
> >      
> >     It occurred to me that since the throttle controller has
> access to
> >     all the EC2 data that it could do a number of things.  The
> two I
> >     have adopted so far are manifold pressure hold and RPM hold.
>
> >     They hold the respective parameter constant at the value it
> was at
> >     when the function was engaged.  Obviously the MP hold can only
> >     work up to the ambient or turbo boost pressure available.  They
> >     are disengaged by either hitting the cancel button or
> sensing that
> >     the pilot is frantically trying to regain control by moving the
> >     power lever.
> >      
> >     Any other ideas for this widget before I freeze the design?
> >      
> >     Tracy Crook
> >      
> >     How about Prop sync ;-)
> >      
> >     Monty
> >      
> >      
> >     My prop is always in sync!
> >      
> >     But seriously, build a plane that needs it and you'll get
> it!  : )
> >      
> >     Tracy
> >
> What is prop sync?  Having two props with crossing arcs, turning
> in
> opposite directions and timed so they don't collide?
>

Ernest, its used mainly in multi-engine a/c. I have one in the 414 I fly and its supposed to simplify the sync of the RPM's of the two motors.. it don't work worth a darn but.. then I've never seen one that does...  I don't know if anyone is building a twin on here, but as Tracy says.. you'd have to build a plane that needs it first..  all the singles in the world don't..  

Now he doesn't know that I've actually design'd a twin I'd like to build w/ rotaries.. but thats a discussion for another day  :-).

Jarrett Johnson
>