> Melchior FRANZ wrote
> Sent: 04 August 2004 19:22
> Cc: Maik Justus
> Subject: [Flightgear-devel] Re: yasim + bo105 + vrp + @#%$#@ == argh!
> * Vivian Meazza -- Wednesday 04 August 2004 19:15:
> > Yes, see what you mean, but I think we went through all this with 
> > fixed wing aircraft. But once fully airborne, it's perfect. 
> Weird. Is 
> > it trying to rotate about a skid?
> No, same when airborne, just harder to see. You better use 
> the "constant-azimuth" view (6?), then try to hover a few 
> meters above the ground, then turn. 
I think all views are fine, although view 2 is a bit disconcerting or even a
bit disorientating. This seems to be a view-based issue. I'm convinced that
the aircraft is rotating appoximately around it's cofg. 
> > Perhaps not enough tail rotor authority in the hover 
> though? I can't 
> > get more than about 30 degs out-of-wind.
> Tail rotor authority seems OK (I talked about it with a real 
> helicopter pilot). But even if it weren't, it wouldn't 
> explain the rotation around the nose. Seems very much like a 
> rotor bug in YASim. Maybe none of the rotor forces act on the 
> CG, but all on the origin. This would make the 3d model look 
> like behaving OK when it was (wrongly) placed with the CG at 
> origin, but not when correctly positioned with the nose on 
> the origin. (Hmm, or not??) 

It's nearly 30 years since I last flew one. 

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