Thanks to Erik Hofman and David Megginson for putting the original model
and two sets of patches into cvs.
This was my first attempt at adding a "model" to fgfs and I learned a
lot by browsing other aircraft, especially the pa28-161 and the dh2.
Some things that are done in this model that may be of interest to other
AC modelers are:
1. The nasal model for the electrical system makes the various
electrical devices only operate if the master switch or any sub bus
switch are both on by checking for voltage. Thus the frequencies don't
light on the radios until both the master switch and the avionics master
switch are closed. Also, the "gear locked" lights don't light until the
master is on. Also the starter won't engage without voltage. I also
tried to model the various loads so the battery drain is more real.
Again, if the battery is drained, no adequate voltage on the bus and
thus no electrical devices work.
2. I created a radio stack model that allowed me to place the 2d radios
from the c172p in a 3d panel as one .ac and .xml model. This was mostly
a time saver as I wanted to get it in the air with dual nav radios and
an adf and dme.
3. I added nav (out of range) flags, TO and From flags to the 3d VOR
model. Also added a heading bug to the 3d HI so the generic auto pilot
is easier to use. Also the altimeter setting is included in the 3d
altimeter. Hot spots were added for most all switches.
This AC is modeled after the AC I co-own and in most ways it flies very
much like the actual AC. I would like any feedback or suggestions on
how to improve the model. Use the help file for the AC (top menu help >
aircraft help) to get it started.
Some questions:
1. There is a white sliver at the top of the right rear window that
does not show up in ac3d. Any help in removing this would be appreciated.
2. At manifold pressures below 20 in hg, the AC has much too much power
compared to the real AC. I normally use 16 in of manifold pressure in
procedure turns and then with the gear down and 15 deg. of flaps, the
descent and airspeed fall in place at the outer marker. I can't even
carry 10 in MP in the model in an approach.
3. A likely related issues is that with the prop all the way "forward",
the RPM stays high at 85 mph and no throttle as I flare out. In the
real AC, the engine cannot keep the prop at high RPM in this situation.
This makes taxiing require a lot of braking or you can pull the prop
back, again not real. Any suggestions form others using yasim with a
constant speed prop.
4. The cruise speeds are very nearly correct if I lean at altitude to
the proper fuel flow. If I leave the mixture rich, the speeds at
altitude are too high. The egt does not help here.
Any suggestions, or comments much appreciated.
regards,
Dave P.
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