Start here
A few places to begin, from the aircraft’s story to the people who fly it.
Aircraft and simulator background
The S.205-18/R is a four-seat, all-metal low-wing aircraft. Its Lycoming O-360 produces 180 hp and turns a two-bladed constant-speed propeller. Electrically retractable tricycle gear and manually selected flaps form the documented configuration.
SIAI-Marchetti S.205-18/R
nemethdesigns.com · Read more ↗Cables, trim and configuration controls
The manual describes a conventional wheel and pedals operating the primary surfaces through cables. The centre trim wheel controls the elevator tab by cable. Electrically retractable gear and four-position manual flaps are separate mechanisms.
SIAI-Marchetti S.205-18/R
nemethdesigns.com · Read more ↗The 18/R propulsion fit
The 18/R configuration uses a 180 hp O-360 and a two-bladed constant-speed propeller. The manual also identifies the autopilot controls.
SIAI-Marchetti S.205-18/R
nemethdesigns.com · Read more ↗Meet SIAI-Marchetti S.205-18/R
The S.205-18/R is a four-seat, all-metal low-wing aircraft. Its Lycoming O-360 produces 180 hp and turns a two-bladed constant-speed propeller. Electrically retractable tricycle gear and manually selected flaps form the documented configuration.
Nemeth's manual describes cable-operated primary controls and an elevator trim tab controlled from a centre wheel. The product's background identifies honeycomb panels in the wing skin as a feature of the design.
SIAI-Marchetti S.205-18/R
SIAI-Marchetti → · Explore the family →
SIAI-Marchetti S.205-18/R
nemethdesigns.com · SIAI-Marchetti S.205-18/R — product and aircraft reference ↗Aircraft type designators
No type designator selected for this reference.
History & design
The S.205 line
The developer's aircraft background dates the S.205's first flight to 1965 and describes civil and military use, particularly training. It identifies an all-metal low-wing airframe whose large honeycomb wing-skin panels reduce the need for conventional riveting.
nemethdesigns.com · SIAI-Marchetti S.205-18/R — product and aircraft reference ↗Product description, configuration and simulator editions
Systems & details
Cables, trim and configuration controls
The manual describes a conventional wheel and pedals operating the primary surfaces through cables. The centre trim wheel controls the elevator tab by cable. Electrically retractable gear and four-position manual flaps are separate mechanisms.
The 18/R propulsion fit
The 18/R configuration uses a 180 hp O-360 and a two-bladed constant-speed propeller. The manual also identifies the autopilot controls.
A four-seat touring and training layout
Nemeth’s S.205-18/R description combines a four-seat cabin with an all-metal low wing, an electrically retractable tricycle undercarriage and a 180 hp O-360. Its two-blade Hartzell is a constant-speed propeller. The developer emphasizes the large honeycomb wing-skin panels used to preserve the laminar profile with fewer rivets. Its published speed and range figures refer to this 18/R rendition; the family name alone is not enough to identify another S.205’s engine or equipment.
In your simulator
Systems, equipment and documentation for each developer’s aircraft.
MSFS 2020 · MSFS 2024Nemeth Designs SIAI-Marchetti S.205-18/R
Nemeth Designs · Released
Nemeth Designs SIAI-Marchetti S.205-18/R
Nemeth Designs · Released
Manuals & resources
Find your next read
Choose a topic for a short introduction and a link to the original source. Simulator references identify the developer and edition they cover.
Developer documentation
SIAI-Marchetti S.205-18/R — product and aircraft referenceSIAI-Marchetti S.205-18/R
Product description, configuration and simulator editions
nemethdesigns.com · Read the source ↗SIAI-Marchetti S.205-18/R — product and aircraft referenceSIAI-Marchetti S.205-18/R
Product description, configuration and simulator editions
nemethdesigns.com · Read the source ↗Developer manual
SIAI-Marchetti S.205-18/R — manualSIAI-Marchetti S.205-18/R
S.205-18/R manual; aircraft description and controls, PDF pp.2–4
nemethdesigns.com · Read the source ↗Read the original documentation from the people who created it. Manuals open on their publisher’s website.
Developer documentation
SIAI-Marchetti S.205-18/R — product and aircraft referencenemethdesigns.com · Product description, configuration and simulator editions SIAI-Marchetti S.205-18/R — product and aircraft referencenemethdesigns.com · Product description, configuration and simulator editionsDeveloper manual
SIAI-Marchetti S.205-18/R — manualnemethdesigns.com · S.205-18/R manual; aircraft description and controls, PDF pp.2–4Built-in force-feedback profiles
Read the documentary basis, editable starting settings and remaining questions for the aircraft you fly. Each explanation refers to the exact profile revision shown.
Catalogue programme-20261011-v3 · 2 profile choices
Nemeth Designs SIAI-Marchetti S.205-18/R
Nemeth Designs · Free and Pro · Revision 1 · Partial review
MSFS 2020 · MSFS 2024
An Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
SIAI-Marchetti S.205-18/R
Free and Pro · Revision 1 · Partial review
MSFS 2020 · MSFS 2024 · X-Plane 12
An Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
SIAI-Marchetti S.205-18/R
An Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
Aircraft and simulator scope
- SIAI-Marchetti S.205-18/R · MSFS 2020 · Variant starting point
- SIAI-Marchetti S.205-18/R · MSFS 2024 · Variant starting point
- SIAI-Marchetti S.205-18/R · X-Plane 12 · Variant starting point
Universal named airframe/configuration; intended MSFS2020/MSFS2024/XP12 starting point, not add-on or edition acceptance. · Physical facts and prior documentary review are reused from their archived dated sources; new market availability is not inferred.
The simulator model and controls
An Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
How this profile feels
Spring resistance builds with the selected airspeed response. A separate aerodynamic term adds speed-dependent control load.
Valid trim provides the configured pressure relief. Autopilot following is off.
Aircraft and configuration
O-360 180 hp engine, two-blade constant-speed propeller, electric retractable gear and four manually selected flap positions.
Archived aircraft manual: conventional wheel/pedals operating surfaces by cable. Electric retractable gear is not hydraulic flight-control boost.
Cables, trim and configuration controls
The manual describes a conventional wheel and pedals operating the primary surfaces through cables. The centre trim wheel controls the elevator tab by cable. Electrically retractable gear and four-position manual flaps are separate mechanisms.
The 18/R propulsion fit
The 18/R configuration uses a 180 hp O-360 and a two-bladed constant-speed propeller. The manual also identifies the autopilot controls.
About the values
Strengths are normalized hardware-feel settings. They set the effect balance; hand force depends on the device and its limits. The IAS reference is a tuning value.
What the documentation establishes
SIAI-Marchetti S.205-18/R: O-360 180 hp engine, two-blade constant-speed propeller, electric retractable gear and four manually selected flap positions.
SIAI-Marchetti S.205-18/R: Archived aircraft manual: conventional wheel/pedals operating surfaces by cable. Electric retractable gear is not hydraulic flight-control boost.
Documentary review and sources
These decisions describe the documentary basis and remaining gaps for this revision. Aircraft documentation and a starting setting describe different kinds of evidence.
Aircraft and variant
ReviewedAn Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
Flight controls
InheritedAn Italian four-seat touring aircraft with retractable gear and a 180 hp Lycoming.
Trim
InheritedThe manual describes a conventional wheel and pedals operating the primary surfaces through cables. Pitch authority 0.3 provides load relief and permitted centre movement; roll authority is 0.
Autopilot and stability
ReviewedAutopilot following is off; the configured spring and load retain the hardware feel.
Equipment
InheritedO-360 180 hp engine, two-blade constant-speed propeller, electric retractable gear and four manually selected flap positions.
Speeds and limits
InheritedThe indicated-speed references set the profile response scale; they are separate from aircraft operating limits.
Simulator integration
ReviewedThe profile targets msfs2020, msfs2024, xplane12. Add-on-specific controls use only the supported references configured by this profile.
Force-feedback settings
InheritedThe settings define the profile’s effect balance. Device output limits affect physical hand force.
Starting settings and their rationale
These configured values are starting estimates. The explanations describe what each setting controls; physical validation appears separately below.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Spring strength | Starting value0.74 | What it controls and whyThe manual describes a conventional wheel and pedals operating the primary surfaces through cables. The baseline spring is 0.74. Its low-speed blend reaches baseline strength at 60 KIAS. |
| Master force gain | Starting value0.85 | What it controls and whyScales overall profile strength while preserving effect balance, subject to device and output limits. |
| Profile force gain | Starting value0.8 | What it controls and whyThe aerodynamic-load gain is 0.8 with an indicated-speed reference of 120 KIAS. This supplies speed-dependent loading alongside the spring. |
| Force tuning speed/reference | Starting value120 kt | What it controls and whySets the IAS reference for aerodynamic loading. It is an estimate, not published cruise TAS or a flight limit. |
| Spring response reference speed | Starting value60.0 kt | What it controls and whySets the IAS where the low-speed blend reaches baseline strength; high-speed stiffening also uses it. |
| Aileron force scale | Starting value0.72 | What it controls and whyRoll and pitch aerodynamic scales are 0.72 and 1, respectively. They set the aerodynamic axis balance. No custom spring-travel curve is enabled. |
| Elevator force scale | Starting value1.0 | What it controls and whyScales pitch aerodynamic loading; pitch spring travel and trim responses are separate settings. |
| Trim feel | Starting valueEnabled | What it controls and whyRetained for compatibility and group membership. Trim relief, rather than this flag, controls centre movement. |
| Trim relief | Starting valueEnabled | What it controls and whyAllows trim relief with supported control law and valid telemetry. Axis authorities set its amount. |
| Autopilot follow | Starting valueDisabled | What it controls and whyAutopilot following is off; the configured spring and load retain the hardware feel. |
| Autopilot neutral hold | Starting valueDisabled | What it controls and whyPermits centering hold during a supported AP state, separate from following a moving target. |
| Output force limit | Starting value0.55 | What it controls and whyCaps directed-force output. Native spring effects and device limits remain separate. |
All 44 starting settings and their rationale
The settings define the profile’s effect balance. Device output limits affect physical hand force.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Spring strength | Starting value0.74 | What it controls and whyThe manual describes a conventional wheel and pedals operating the primary surfaces through cables. The baseline spring is 0.74. Its low-speed blend reaches baseline strength at 60 KIAS. |
| Profile force gain | Starting value0.8 | What it controls and whyThe aerodynamic-load gain is 0.8 with an indicated-speed reference of 120 KIAS. This supplies speed-dependent loading alongside the spring. |
| Elevator force scale | Starting value1.0 | What it controls and whyScales pitch aerodynamic loading; pitch spring travel and trim responses are separate settings. |
| Aileron force scale | Starting value0.72 | What it controls and whyRoll and pitch aerodynamic scales are 0.72 and 1, respectively. They set the aerodynamic axis balance. No custom spring-travel curve is enabled. |
| Output force limit | Starting value0.55 | What it controls and whyCaps directed-force output. Native spring effects and device limits remain separate. |
SIAI-Marchetti S.205-18/R: Cable-controlled elevator trim tab/centre wheel documented; pitch relief estimate, no roll trim inferred. Estimated pitch/roll trim authorities 0.3/0; exact add-on sign, travel, units and build-specific neutral remain unqualified. Rudder trim never substitutes for roll trim.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Elevator Authority | Starting value0.3 | What it controls and whyThe manual describes a conventional wheel and pedals operating the primary surfaces through cables. Pitch authority 0.3 provides load relief and permitted centre movement; roll authority is 0. |
| Aileron Authority | Starting value0 | What it controls and whyScales supported roll-trim relief and permitted centre movement. Zero removes roll response. |
SIAI-Marchetti S.205-18/R: 120 KIAS is the retained estimated tuning reference. It is not published cruise TAS, VNE, a new flight limit or a measured force threshold. Source-specific operating quantities remain attached to their original configuration and conditions.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Force tuning speed/reference | Starting value120 kt | What it controls and whySets the IAS reference for aerodynamic loading. It is an estimate, not published cruise TAS or a flight limit. |
Flap and gear texture require observed mechanism movement; position selection does not establish actuator-force calibration.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Gain | Starting value0.12 | What it controls and whyFlap and gear texture require observed mechanism movement; position selection does not establish actuator-force calibration. |
| Gain | Starting value0.025 | What it controls and whyFlap and gear texture require observed mechanism movement; position selection does not establish actuator-force calibration. |
Exact configured values with software explanations. Force magnitudes remain editable estimates; disabled features retain inactive values.
| Setting | Starting value | What it controls and why |
|---|---|---|
| Spring deadband | Starting value0.045 | What it controls and whySets travel around the centre before the baseline spring resists. Smaller values engage it sooner. |
| Master force gain | Starting value0.85 | What it controls and whyScales overall profile strength while preserving effect balance, subject to device and output limits. |
| QBlend Enabled | Starting valueEnabled | What it controls and whyAllows baseline spring strength to rise with indicated airspeed where the control law permits it. |
| QSpring Minimum Factor | Starting value0.5 | What it controls and whySets low-speed spring strength as a fraction of baseline when blending is enabled. One keeps full strength. |
| QSpring Start Knots | Starting value16.8 kt | What it controls and whySets the IAS where the low-speed spring blend starts rising. This is a feel threshold, not a flight limit. |
| Spring response reference speed | Starting value60.0 kt | What it controls and whySets the IAS where the low-speed blend reaches baseline strength; high-speed stiffening also uses it. |
| Airspeed spring stiffening gain | Starting value0.15 | What it controls and whyThe high-speed spring-stiffening gain is 0.15. It strengthens the permitted spring response above 60 KIAS, with the squared-speed ratio capped at 5. |
| Airspeed spring stiffening limit | Starting value5 | What it controls and whyLimits the squared airspeed ratio used for high-speed spring stiffening; it is not a device-force cap. |
| Trim feel | Starting valueEnabled | What it controls and whyRetained for compatibility and group membership. Trim relief, rather than this flag, controls centre movement. |
| Trim relief | Starting valueEnabled | What it controls and whyAllows trim relief with supported control law and valid telemetry. Axis authorities set its amount. |
| Force Trim Enabled | Starting valueDisabled | What it controls and whyEnables local force trim, separate from aircraft-owned trim and add-on integration qualification. |
| GLoad Enabled | Starting valueEnabled | What it controls and whyAllows load-factor changes to modify permitted spring laws. Passive fly-by-wire feel can suppress it. |
| Rate Damping Enabled | Starting valueEnabled | What it controls and whyEnables rate damping with the configured coefficients and control law. |
| Autopilot follow | Starting valueDisabled | What it controls and whyAutopilot following is off; the configured spring and load retain the hardware feel. |
| Autopilot follow authority | Starting value0.1 | What it controls and whySets admitted AP-follow gain, not a percentage of travel. Runtime ownership and input limits still apply. |
| Autopilot neutral hold | Starting valueDisabled | What it controls and whyPermits centering hold during a supported AP state, separate from following a moving target. |
| Autopilot neutral hold strength | Starting value0.6 | What it controls and whySets admitted AP neutral-hold strength; inactive while neutral hold is disabled. |
| Enabled | Starting valueEnabled | What it controls and whyEnables aerodynamic cues; each still needs nonzero strength and its simulator conditions. |
| Gain | Starting value0.35 | What it controls and whySets stall-buffet strength. Zero removes the cue without changing simulator stalls or warnings. |
| Gain | Starting value0 | What it controls and whySets high-Mach buffet strength; onset and full-strength thresholds are separate. |
| Gain | Starting value0.14 | What it controls and whySets flap buffet at the configured position and speed gates. Flap movement texture is separate. |
| Maximum flap index | Starting value3 | What it controls and whySets the final flap index for detent normalization. UP plus three detents uses maximum index3. |
| Minimum flap index | Starting value2 | What it controls and whySets the first flap detent that admits buffet; this is a handle index, not degrees. |
| Gain | Starting value0 | What it controls and whySets gear aerodynamic buffet; movement and ground-contact cues are separate. |
| Shaker Enabled | Starting valueDisabled | What it controls and whyPermits shaker at supported warning conditions; the switch does not establish aircraft equipment. |
| Stick shaker amplitude | Starting value0.5 | What it controls and whySets triggered shaker strength; inactive while the shaker feature is disabled. |
| Enabled | Starting valueEnabled | What it controls and whyEnables ground effects; each still needs its own strength and contact or motion telemetry. |
| Gain | Starting value0.4 | What it controls and whySets rolling texture strength, modified by speed, surface and undercarriage configuration. |
| Gain | Starting value0.25 | What it controls and whySets gear-bump texture during ground motion, separate from touchdown impact. |
| Gain | Starting value0.65 | What it controls and whySets landing-impact strength; landing telemetry and response shape determine the pulse. |
| Gain | Starting value0 | What it controls and whySets reverse-thrust vibration with valid reverser and engine conditions. Zero removes the cue. |
| Enabled | Starting valueEnabled | What it controls and whyEnables engine cues with nonzero settings and valid running-engine telemetry. |
| Gain | Starting value0.12 | What it controls and whySets estimated engine vibration using configured telemetry and response, not measured cockpit vibration. |
| Enabled | Starting valueEnabled | What it controls and whyEnables accessory cues with configured strengths and observed accessory movement. |
Limits and open questions
- SIAI-Marchetti S.205-18/R is a universal starting point; exact add-on matching, edition operation and physical hand-force calibration remain unqualified.
- Autopilot movement and unknown custom trim, failure or force-input signals are disabled. Confirm the selected equipment fit and trim direction for the implementation in use.
- Force magnitudes and speed tuning are editable inherited estimates. Owner physical and installed-aircraft acceptance remain pending.
Physical validation
No physical force validation is recorded in this public catalogue for this revision. Documentary review and software checks do not establish how a particular device feels.
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