FlyJSim 732 TwinJet V4
FlyJSim 732 TwinJet V4: The fixed roll-feel mechanism and separate pitch artificial feel motivate distinct axis balance; an aerodynamic scale alone cannot describe total pitch/roll effort.
Aircraft and simulator scope
- FlyJSim 732 TwinJet V4 · FlyJSim · X-Plane 12 · Add-on starting point
The simulator model and controls
The first 737 flew in 1967. Boeing retained the six-abreast fuselage width familiar from its earlier jets while placing two engines under the wing. The aircraft subsequently developed through the Original, Classic, Next Generation and MAX generations.
This profile selects FlyJSim 732 TwinJet V4 for X-Plane 12.
How this profile feels
Spring resistance builds with the selected airspeed response. Directed aerodynamic loading is omitted.
Pitch-trim relief is off. Autopilot following is off.
Controls and trim
The 737's aileron feel uses a cam, roller and spring-centering unit with breakout and gradient that stays constant with airspeed. Pitch artificial feel differs, so the total pitch-to-roll effort balance can change with speed. PMDG's NG introduction also distinguishes electric-trim limits by model and flap state, and CWS from CMD. Those NG details are not automatically MAX, Classic or early-737 interface evidence.
The selected implementation
FlyJSim's 737-200 Advanced uses JT8D-15A, authentic/assisted SP77, CWS and optional UNS-1. Its Classic guidance is separate from NG/MAX interfaces.
Pitch and roll feel
The aircraft’s documented roll spring is speed-independent. This revision uses a shared profile airspeed response where enabled; it does not provide a separate measured pitch-versus-roll feel schedule.
About the values
The gains are normalized profile settings. They describe the chosen effect balance; hand force depends on the device and its output limits. IAS references are tuning values rather than operating limits. Physical acceptance of this revision remains pending.
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
InheritedThis profile selects FlyJSim 732 TwinJet V4 for X-Plane 12.
Flight controls
InheritedThe 737's aileron feel uses a cam, roller and spring-centering unit with breakout and gradient that stays constant with airspeed. Pitch artificial feel differs, so the total pitch-to-roll effort balance can change with speed. PMDG's NG introduction also distinguishes electric-trim limits by model and flap state, and CWS from CMD. Those NG details are not automatically MAX, Classic or early-737 interface evidence.
Trim
InheritedDocumented electric-trim limits vary with model and flap state; a selected trim response is a simplification and does not recreate every NG or MAX trim law. Pitch relief is off, with stored authority 0; roll authority is 0.
Autopilot and stability
InheritedAutopilot following is off; the configured spring and load retain the hardware feel.
Equipment
InheritedFlyJSim's 737-200 Advanced uses JT8D-15A, authentic/assisted SP77, CWS and optional UNS-1. Its Classic guidance is separate from NG/MAX interfaces.
Speeds and limits
InheritedThe indicated-speed references set the profile response scale; they are separate from aircraft operating limits.
Simulator integration
InheritedThe profile targets 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 value0.2 | What it controls and whyThe fixed roll-feel mechanism and separate pitch artificial feel motivate distinct axis balance; an aerodynamic scale alone cannot describe total pitch/roll effort. The baseline spring is 0.2. Low-speed spring blending is off. |
| 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 | What it controls and whyThe stored 0 aerodynamic-load gain is inactive under the zero hydraulic-load factor. |
| Force tuning speed/reference | Starting value240 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 value122 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 value0.78 | What it controls and whyRoll and pitch aerodynamic scales are 0.78 and 1, respectively. These stored weights do not create directed aerodynamic loading while that term is inactive. No custom spring-travel curve is enabled. |
| Elevator force scale | Starting value1 | What it controls and whyScales pitch aerodynamic loading; pitch spring travel and trim responses are separate settings. |
| Trim feel | Starting valueDisabled | What it controls and whyRetained for compatibility and group membership. Trim relief, rather than this flag, controls centre movement. |
| Trim relief | Starting valueDisabled | 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 46 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 value0.2 | What it controls and whyThe fixed roll-feel mechanism and separate pitch artificial feel motivate distinct axis balance; an aerodynamic scale alone cannot describe total pitch/roll effort. The baseline spring is 0.2. Low-speed spring blending is off. |
| Spring deadband | Starting value0.0 | What it controls and whySets travel around the centre before the baseline spring resists. Smaller values engage it sooner. |
| Starting centering force | Starting value0.08 | What it controls and whyAdds smoothly ramped resistance outside the centre deadband. Zero removes this preload. |
| Center Starting Force Transition | Starting value0.05 | What it controls and whySets the travel used to ramp in centre preload. Wider intervals make its onset more gradual. |
| Profile force gain | Starting value0 | What it controls and whyThe stored 0 aerodynamic-load gain is inactive under the zero hydraulic-load factor. |
| 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 valueDisabled | What it controls and whyAllows baseline spring strength to rise with indicated airspeed where the control law permits it. |
| QSpring Minimum Factor | Starting value0.55 | 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 value8 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 value122 kt | What it controls and whySets the IAS where the low-speed blend reaches baseline strength; high-speed stiffening also uses it. |
| Force tuning speed/reference | Starting value240 kt | What it controls and whySets the IAS reference for aerodynamic loading. It is an estimate, not published cruise TAS or a flight limit. |
| Airspeed spring stiffening gain | Starting value1.0 | What it controls and whyThe high-speed spring-stiffening gain is 1. It strengthens the permitted spring response above 122 KIAS, with the squared-speed ratio capped at 7.8. |
| Airspeed spring stiffening limit | Starting value7.8 | What it controls and whyLimits the squared airspeed ratio used for high-speed spring stiffening; it is not a device-force cap. |
| Aileron force scale | Starting value0.78 | What it controls and whyRoll and pitch aerodynamic scales are 0.78 and 1, respectively. These stored weights do not create directed aerodynamic loading while that term is inactive. No custom spring-travel curve is enabled. |
| Elevator force scale | Starting value1 | What it controls and whyScales pitch aerodynamic loading; pitch spring travel and trim responses are separate settings. |
| Output force limit | Starting value0.55 | What it controls and whyCaps directed-force output. Native spring effects and device limits remain separate. |
| Trim feel | Starting valueDisabled | What it controls and whyRetained for compatibility and group membership. Trim relief, rather than this flag, controls centre movement. |
| Trim relief | Starting valueDisabled | What it controls and whyAllows trim relief with supported control law and valid telemetry. Axis authorities set its amount. |
| Elevator Authority | Starting value0 | What it controls and whyDocumented electric-trim limits vary with model and flap state; a selected trim response is a simplification and does not recreate every NG or MAX trim law. Pitch relief is off, with stored authority 0; 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. |
| 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 valueDisabled | 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 valueDisabled | 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 | 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 | What it controls and whySets flap buffet at the configured position and speed gates. Flap movement texture is separate. |
| Maximum flap index | Starting value8 | 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 valueEnabled | What it controls and whyPermits shaker at supported warning conditions; the switch does not establish aircraft equipment. |
| Stick shaker amplitude | Starting value0.9 | 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 value0.32 | What it controls and whySets gear-bump texture during ground motion, separate from touchdown impact. |
| Gain | Starting value0.9 | 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 value0.06 | 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. |
| Gain | Starting value0.12 | What it controls and whySets texture from observed flap movement; a command without movement does not establish the cue. |
| Gain | Starting value0.12 | What it controls and whySets texture from observed gear movement, separate from aerodynamic and touchdown effects. |
Limits and open questions
- FlyJSim 732 TwinJet V4; xplane12. Previously observed titles and implementation identifiers are retained; installed matching remains deferred.
- Powered conventional yoke with nominal artificial feel. Residual aerodynamic load, manual reversion and blowdown need qualified system state; no invented failure force.
- Stabilizer trim does not directly command yoke centre. No NG/MAX trim mapping copied into the Classic.
- Authentic SP77 TURB mode and no automatic level-off differ from assisted mode; CWS and annunciation do not establish servo targets. No Zibo or PMDG signal reuse. AP servo-follow and neutral hold remain disabled; engagement indicators are not force-demand signals.
- Twin JT8D jets, retractable wheels, high-lift devices. UNS1 navigation retrofit and assisted AP option do not change nominal spring.
- 240 KIAS is an estimated feel reference, not cruise TAS or a certified limit. No invented Mach, VNE or weight scheduling.
- Read-only native telemetry for aircraft motion and accessory positions. Custom switches, display animations and mode lamps are not calibrated servo targets. No unverified LVars/datarefs or simulator writes.
- Spring 0.2 at the feel floor; lateral scale 0.78; trim authorities 0/0; per-axis output cap 0.55. Editable engineering estimates, not measured hand forces. No body-rate torque, surface following or fabricated hydraulic-failure loads.
- New physical and installed-product checks deferred by owner. Existing separately recorded acceptance retains its original device, simulator, add-on and version limits. Source review does not broaden custom telemetry acceptance.
- Only actual accessory position changes drive movement texture; static drag and command-triggered kicks are disabled. Select and save an aircraft default when telemetry lacks a discriminating developer/configuration identity.
- 2026-10-01, Boeing artificial feel (docs/poh/b737800-feel-spec.md, docs/research/05-transport-airliner-fbw.md, PMDG 737 introduction 0.00.30): spring 0.2 at the feel-pressure floor up to 122 kt, rising with dynamic pressure above it (737 feel pressure 180 to 1,400 psi, cap 7.8) and reaching the device's full spring at about 273 kt; a 0.08 centre starting force with no spring deadband for the 5-8 lbf breakout, so a released column returns to neutral (PMDG reverted CMD to CWS with the stick resting 1.4-1.7 % off centre inside a 0.01 deadband); no directed aerodynamic load, trim relief or G spring (the feel computer takes airspeed and stabilizer position, and trim moves the stabilizer, not the column neutral); stick shaker 0.90; autopilot follow at full authority where a qualified reference exists. Roll firms with airspeed as pitch does, while the real roll feel is a constant spring cam. The stabilizer-position feel term, Elevator Feel Shift and forces calibrated in pounds are not modelled.
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.