Well, it may not be the right fix, but as with the Aermacchi 339B, changing the rotation property for each of the three Ryan Navion cards from "instrumentation/heading-indicator/indicated heading-deg" to
"orientation/heading-magnetic-degree" made each rotate.
The instruments were in Ryan-Navion>Models>Interior>Panel>Instruments>
They are identified as Hi, KI252A, and KR-87 ADF>ki227-01.
Strictly from a user standpoint, this seems to restore functionality of card; however, the radio navigation functions still don't work (regardless of whether card rotation has been changed or not.).
Kind Regards
P.S. WoodSTokk mentioned the low engine RPM. The current property "engines/engine/rpm=2082.35" is low, which explains the FG Ryan Navion's only attaining 2000 at full throttle and its poor rate of climb.
P.P.S. Just noticed in Ryan Navion-yasim that whereas under <propeller.. take-off-rpm="2600"
and take-off-power="280"; In <piston-engine compression...engine-power="205". Fishy.
Looks like "205" could have been a typo where "285" was intended. Will check it out.
Aah. Might be wrong fix; but it worked-now get 2400rpm on deck with full throttle, and around 2350 on climb out with full throttle-much better.
Navion is an excellent, well developed model; and I really enjoy flying it.