Honeycomb Sierra TPM Setup Guide: GA Engine Controls, Mounting and MSFS Profiles

The Honeycomb Sierra TPM Module is built for general-aviation engine management: throttle, propeller and mixture are placed in the familiar black, blue and red vernier layout, with trim, parking brake, flaps and landing-gear control integrated into the same unit. It is not a generic six-lever airliner quadrant. That distinction makes the Sierra especially relevant for piston aircraft such as the Cessna 172 and Piper-style trainers, where small mixture and propeller adjustments are part of almost every flight.

This guide explains what the Sierra controls, how to position and connect it, how to map it in Microsoft Flight Simulator or X-Plane, and when it makes more sense than expanding a Honeycomb Bravo setup.

What the Honeycomb Sierra TPM Module includes

The three push-pull vernier axes control throttle, propeller RPM and mixture. Honeycomb uses lockable metal verniers: the throttle can be fixed with the shaft screw, while the propeller and mixture knobs support fine adjustment by rotating the knob. That is useful during cruise, leaning and approach, where a short push-pull axis can otherwise make precise changes difficult.

The panel also provides a high-resolution trim wheel, a parking-brake control, a flap lever and a landing-gear lever with LED status indicators. Honeycomb lists USB-C to USB-A connectivity, PC and Mac support, and compatibility with Microsoft Flight Simulator, X-Plane 11/12 and Prepar3D. A USB cable and mounting solution are included.

Who should choose Sierra?

Best fit: piston general aviation

Choose Sierra if you mainly fly single-engine or light twin piston aircraft and want the engine controls to match the cockpit workflow. It is particularly logical for training-oriented sessions, VFR touring and IFR practice in aircraft where mixture and propeller settings matter.

Less suitable: airliner-only flying

If you only fly Airbus or Boeing jets, a multi-lever throttle quadrant with detents, reversers and dedicated speed-brake/flap handles is usually a closer match. Sierra can still be mapped, but its vernier layout is purpose-built for general aviation rather than jet power management.

Pairing with a yoke

The Sierra is a standalone USB peripheral, so it does not require a Honeycomb yoke. For a compact matched desktop setup, the Honeycomb Alpha Flight Controls Lite adds pitch and roll control plus an integrated switch panel. The two devices should be treated as separate USB controllers and mapped separately in the simulator.

Desk and cockpit placement

1. Put the primary axis under your dominant hand

Mount the Sierra where your forearm can remain supported and your wrist stays neutral. Right-handed pilots commonly place it to the right of the yoke, but left-side installation can make sense for aircraft or training layouts that use a left-hand power control. The important point is repeatability: you should reach the throttle without looking away from the screen.

2. Leave room for the full control travel

Before tightening the mount, push and pull all three verniers through their full range and operate the flap and gear levers. Check that no knob hits the monitor stand, desk edge or keyboard. The module measures approximately 298 mm wide, 303 mm deep and 123 mm high, so plan more than just the visible front-panel footprint.

3. Keep the panel stable

Fine vernier adjustment only feels precise when the enclosure stays still. Use the supplied mounting solution on a solid desk or a rigid flight-sim plate. Avoid placing it on a loose shelf or soft mat that moves when the throttle is pushed forward.

USB and software setup

1. Install the module firmly before connecting it. This prevents the USB cable from being used as a handle while you adjust the mount.
2. Connect the supplied USB-C cable to the Sierra and the USB-A end directly to the PC or Mac for the first configuration. Add a powered hub only if you need more ports and it is stable under load.
3. Open the operating-system controller panel and verify that all three axes travel smoothly from minimum to maximum.
4. In the simulator, create a dedicated Sierra profile rather than editing a generic throttle profile. Map throttle, propeller and mixture to their matching axes.
5. Map trim, parking brake, flaps and landing gear. Install Honeycomb’s landing-gear LED driver where required and use the published aircraft profiles as a starting point.
6. Save profiles by aircraft type. A fixed-pitch trainer should not share an identical profile with a complex retractable-gear aircraft.

Calibration tips for realistic GA control

Start with a linear response and no dead zone unless the simulator shows jitter at rest. Move each axis slowly and confirm that the on-screen value reaches both endpoints. If idle power is difficult to set, add only the smallest dead zone needed. Large dead zones make the first part of the throttle travel feel unresponsive.

For the mixture axis, verify both “full rich” and “idle cut-off.” For the propeller axis, check that the simulator recognizes the complete RPM range. When an aircraft uses a fixed-pitch propeller, leave the blue control unmapped or create a separate profile rather than assigning it to an unrelated function.

Use the trim wheel for gradual changes. If the simulated trim moves too quickly, adjust the simulator’s input sensitivity or repeat rate instead of rotating the physical wheel in abrupt steps.

Practical profile examples

Cessna 172-style profile

• Black vernier: throttle axis.
• Blue vernier: propeller axis only on constant-speed-propeller variants; otherwise leave unused.
• Red vernier: mixture axis with full-rich and cut-off endpoints checked.
• Gear lever: leave unassigned on fixed-gear variants.
• Flap lever and trim wheel: assign and test through the full range.

Complex single or light twin

Use all three verniers, map the gear lever and confirm the LED driver reports the correct gear state. For twins, check whether the aircraft expects combined or separate engine axes. Sierra presents one throttle, propeller and mixture control, so it is best for aircraft that accept combined engine management.

Common mistakes

• Using one universal profile for every aircraft.
• Mapping the same function twice on the Sierra and another controller, causing conflicting inputs.
• Installing the module too close to the monitor, limiting vernier travel.
• Assuming the gear LEDs work without the required driver or supported profile.
• Using an unpowered USB hub already loaded with displays, webcams and other high-demand devices.

FAQ

Does the Honeycomb Sierra TPM work without an Alpha yoke?

Yes. It is a standalone USB controller. A yoke or joystick is still required for pitch and roll, but it does not need to be from Honeycomb.

Is Sierra compatible with Microsoft Flight Simulator 2024?

Honeycomb lists Microsoft Flight Simulator 2024 and 2020 support, along with X-Plane 11/12 and Prepar3D. Aircraft-specific mapping can still be necessary.

Can Sierra control a twin-engine aircraft?

It can control combined throttle, propeller and mixture axes. Aircraft that require six independently controlled engine axes are better matched to a multi-lever quadrant.

Does it work on Xbox or PlayStation?

The current Sierra is listed for PC and Mac. Do not buy it on the assumption of console compatibility.

Final recommendation

The Sierra is the focused choice for pilots who spend most of their time in piston general aviation and want fine engine-management control in a compact panel. Mount it solidly, create aircraft-specific profiles and verify the gear LED driver before the first serious flight. View the Honeycomb Sierra TPM Module and the compatible Alpha Flight Controls Lite at Sim Race Webshop.

Technical and image reference: Honeycomb Aeronautical official Sierra TPM page. Specifications and availability were checked on 5 October 2026.