David Megginson wrote:
> On 22/02/06, Andy Ross <[EMAIL PROTECTED]> wrote:
>
>
>>But the variable speed code will always seek to the specified RPM, and
>>the current model gives it enough wiggle room to push the torque as
>>far down as it wants, essentially. You could try setting a
>>different/tunable "floor" to the pitch value (see the clamping in
>>Propeller::modPitch()), but getting that value right is going to take
>>a lot of experimentation.
>
>
> Since I don't have the time or expertise to do the right thing, I've
> added a work-around.
>
> The values in mod pitch are (loose) representations of the physical
> stops in a constant speed propeller. For many of the models, the
> fine-pitch stop allows too small a pitch, thus allowing the propeller
> to spin too fast at low power settings.
>
> I've just checked in some patches to allow aircraft designers to
> change these values at runtime, using the attributes "fine-stop" and
> "coarse-stop" to fine-tune the propeller. Currently, these default to
> the previously hard-coded values of 0.25 and 4.00, so current flight
> models won't be affected.
>
> When I set "fine-stop" to 1.0, for example, the Comanche (pa24-250)
> idles at a much more realistic RPM, and approach RPM also looks more
> credible -- I haven't checked in that change until Dave Perry reviews
> it, though (I'll send him the patch in a private e-mail).
>
> The user-visible (i.e. aircraft designer-visible) changes are
> documented in $FG_ROOT/Docs/README.yasim. Anyone maintaining a YASim
> flight model with (a) constant-speed propeller(s) should consider
> playing with these values a bit.
>
>
> All the best,
>
>
> David
>
> --
> http://www.megginson.com/
>
>
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Anybody else getting this?
Making all in YASim
make[3]: Entering directory `/usr/local/src/FlightGear/source/src/FDM/YASim'
if ccache g++ -DHAVE_CONFIG_H -I. -I. -I../../../src/Include -I../../..
-I../../../src -I/usr/local/include -I/usr/X11R6/include -Wall -O2
-funroll-loops -march=athlon -g -I/usr/local -D_REENTRANT -MT YASim.o
-MD -MP -MF ".deps/YASim.Tpo" -c -o YASim.o YASim.cxx; \
then mv -f ".deps/YASim.Tpo" ".deps/YASim.Po"; else rm -f
".deps/YASim.Tpo"; exit 1; fi
YASim.cxx:1: error: expected unqualified-id before '<<' token
/usr/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0.3/i486-linux-gnu/bits/c++config.h:68:
error: '__gnu_debug_def' is not a namespace-name
/usr/lib/gcc/i486-linux-gnu/4.0.3/../../../../include/c++/4.0.3/i486-linux-gnu/bits/c++config.h:68:
error: expected namespace-name before ';' token
BodyEnvironment.hpp:75: warning: 'class yasim::BodyEnvironment' has
virtual functions but non-virtual destructor
Engine.hpp:16: warning: 'class yasim::Engine' has virtual functions but
non-virtual destructor
PistonEngine.hpp:8: warning: 'class yasim::PistonEngine' has virtual
functions but non-virtual destructor
make[3]: *** [YASim.o] Error 1
make[3]: Leaving directory `/usr/local/src/FlightGear/source/src/FDM/YASim'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/local/src/FlightGear/source/src/FDM'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/local/src/FlightGear/source/src'
make: *** [all-recursive] Error 1
Josh
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