Water Sensor
Fly Henry Threaded Water / Coolant Temperature Sensor
Engineered specifically for liquid-cooled Paramotors (PPG), Microlights, and Ultralight (ULL) aircraft, this threaded brass probe delivers real-time coolant temperature monitoring directly to your cockpit instrument. Available in M6, M8, or M10 thread pitches with a choice of 50 cm or 80 cm cable leads to match any cylinder head or inline radiator plumbing.
Choosing Your Sensor Configuration
Verify your cylinder head tap size or inline hose adapter diameter before ordering:
| Thread Size | Typical Location | Common Engine Applications |
|---|---|---|
| M6 × 1.0 | Cylinder head bleed port or compact inline sensor union | Vittorazi Moster 185 (Water-Cooled), Polini Thor 80/130, compact 2-strokes |
| M8 × 1.0 | Factory cylinder head sensor boss or aluminium hose T-piece | Polini Thor 190/200/250, Corsair Black Devil liquid-cooled conversions |
| M10 × 1.0 | Thermostat housing, pump housing, or heavy-duty cylinder head port | Rotax 582, Simonini Mini 2+ liquid-cooled, Hirth, and larger aircraft engines |
50 cm Cable Length
Tailored for close-coupled paramotor setups where the Fly Henry sensing module is mounted to the immediate motor backing plate, redrive frame, or upper harness spar. Keeps engine cabling tidy with no excess slack.
80 cm Cable Length
Engineered for aircraft with remote radiator layouts, trike frames, or tandem setups where the sensing unit is housed in a protected cockpit enclosure or forward bulkhead.
Engineering & Reliability Features
Built specifically to protect liquid-cooled aero engines from thermal stress:
Direct Fluid Immersion
The turned brass housing places the internal thermal sensor directly into the coolant stream, providing rapid temperature response times to detect pump failures or coolant loss before overheating can cause damage.
Fly Meter Native Integration
Pairs directly with the dedicated 0–125°C fluid input channel on the Fly Henry Fly Meter. Select the native Fly Henry profile in the setup menu for instant calibration with no manual resistance entry required.
Robust Sealing Shoulder
Machined with an integrated hexagonal body and sealing seat, allowing reliable torquing against copper, aluminium, or bonded crush washers to eliminate cooling system leaks under system pressure.
Oil & Fuel Resistant Lead
The outer protective sheath resists glycol coolants, synthetic 2-stroke oils, and aviation fuels, maintaining its flexibility and mechanical strength despite engine compartment vibration.
Technical Specifications
| Sensor Architecture | Threaded direct immersion liquid temperature probe |
| Available Thread Sizes | M6 × 1.0 • M8 × 1.0 • M10 × 1.0 metric threads |
| Available Harness Lengths | 50 cm (approx. 20″) & 80 cm (approx. 31.5″) |
| Measurement Range | 0°C to 125°C (32°F to 257°F) continuous |
| Housing Material | Solid turned brass with machined sealing shoulder |
| Instrument Compatibility | Fly Henry Fly Meter (Dedicated Fluid Channel) & universal EIS units |
| Target Aircraft | Liquid-cooled Paramotors (PPG), Microlights, Trikes, and Ultralights |
| Manufacturer / Brand | Fly Henry |
|---|---|
| Part Number / SKU | WTR506 |
| Fitment Type | Aviation Standard Fitment |
Technical Inquiry for Water Sensor
Confirm wiring loom compatibility, panel depths, or kit lead times with our engineering team.