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Cessna 182S

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Revision as of 00:38, 5 August 2012 by Tent405 (Talk | contribs) (A very badly needed cleanup for issues that are no longer problems due to ongoing development. Issues should be tracked in the issue tracker, not on the wiki page.)

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Cessna 182
Cessna 182.jpg
Type Civilian aircraft
Author(s) Stuart Buchanan
FDM JSBSim
--aircraft= c182
Status Early production
 FDM Stars-3.png
 Systems Stars-3.png
 Cockpit Stars-2.png
 Model Stars-4.png

The Cessna 182 Skylane is an American four-seat, single-engine, light airplane, built by Cessna of Wichita, Kansas.

Development status/Issues/Todo

Outside

Cockpit instruments can be seen through the aileron
This is presumably not aircraft-specific; see the Z-buffer burn-through item on the project-wide Bugs page.
aircraft has no shadow
The model has no landing light (See below)
This detracts only slightly from the realism of the landing, because at touchdown attitude, the pitch attitude is so high that the landing light is pointing way up in the air; therefore almost anything that could possibly be lit up by the landing light is blocked from view by the cowling. A privately-owned aircraft is not even required to have a landing light, even when being operated at night. Landing with burned-out landing lights is no big deal ... assuming the runway-edge lights are working. The so-called landing light is mostly just a taxi light. The only part of the landing where the landing light is really useful is for reading the big painted number on the runway, to confirm that you aren't landing on the wrong runway.

Cockpit

No outside-air-temperature gauge.
There are empty spots for extra gauges, should be easy.
The 2D cockpit instruments are visible through the 3D yoke.
This is another example of "burn through".
Can't hear sound when pressing the switches and levers in the cockpit.
No rudder trim control or indicator.

General

The model doesn't implement cowl flaps.
This affects the realism, especially if you are using the model for "transition training" into complex aircraft. Cowl flaps are part of the workload that makes the thing complex. Also they underline the point that the checklist that works for one aircraft doesn't necessarily work for them all.
Oil pressure problems.
In the model, after flying for a while, the oil pressure falls below the bottom of the green. Not by a lot, but definitely outside the green range, and therefore outside the normal range. Is this perhaps because somebody forgot to open the cowl flaps? This detracts from the realism; most pilots would be very unhappy flying an aircraft with out-of-normal oil pressure.
Unrealistic adverse yaw.
In cruise, the model has much more adverse yaw than a real Skylane. The real thing has differential aileron deflection which the designers have lovingly tuned so that you can cruise with your feet on the floor (not on the pedals). At low airspeeds, of course, the real aircraft still has plenty of adverse yaw.
Unrealistic damping, or lack thereof.
Compared to the real aircraft, the model seems to have not enough yaw-wise damping and not enough roll-wise damping. (Taken together these imply not enough damping of the Dutch roll mode, but this is a corollary, not a separate issue.) Roughly speaking, this creates the impression that the model is harder to handle than the real aircraft.
Engine sound in cockpit does not differ from outside engine sound.
Bad "reset" behavior.
Aircraft is sometimes flipped when pressing the reset button.
Aircraft has the wrong elevation (approximately 20 meter above the runway) after pressing the reset key
Flaps/power/trim interaction.
The C182 model does not realistically capture the flap/power/trim interaction. In the model, extending the flaps seems to cause a nose-down pitching moment, which is the wrong direction. And the power-dependence of the effect is not realistically modelled. In a real C182 / C172 / C152 / C150, the flap/trim interaction can be described as follows:
  • Changing the flap setting has little effect when the engine is at idle.
  • Changing the power setting has little effect when the flaps are in the retracted position.
  • However, there is a multiplicative effect: Adding power causes a nose-up pitching moment when flaps are in an extended position. Or, to say the same thing, extending the flaps causes a nose-up pitching moment. The effect is in proportion to the amount of power being developed *times* the amount of flap deflection.
Unrealistic brake noise.