Product Description

The Kestrel 4250 Racing Weather Tracker has been designed for those on the motor racing track, providing a portable weather monitoring station.

The Kestrel 4250 enables racers and pit crews to instantly assess the environmental conditions on the track and to tune their machines accordingly.

The Kestrel 4250 gives critical measurements of air density, relative air density (RAD), station pressure, moisture content (humidity ratio) and density altitude to racers. With this accurate weather data, racers are able to make those last minute dial-in or tuning decisions.

The atmospheric pressure, temperature and humidity all affect the density of the air. On a hot day, at high altitude or on a moist day, the air is less dense. A reduction in air density reduces the amount of oxygen available for combustion and therefore reduces the engine horsepower and torque possible. For tweaking the fuel/air mixture, the air density is the most important consideration.

Kestrel 4250 measures

• Wind speed
• Temperature
• Relative Humidity
• Moisture content / humidity ratio / water grains
• Dew Point
• Station pressure
• Barometric pressure
• Air density
• Relative air density (RAD)
• Density altitude
• Wind Chill
• Heat index
• Wet bulb temperature
• Altitude
• Time & Date

Choice of measurement units

• kt, m/s, km/h, mph, ft/min, Beaufort
• ºC, ºF
• %
• mbar, inHg, hPa, psi
• m, ft
• kg/m3, lb/ft3
• g/kg, gpp

Accuracy

• Speed ±3% of reading or ±0.1m/s
• Temperature ±1ºC
• Relative humidity ±3%
• Dew point ±2ºC
• Pressure ±1.5mbar
• Density altitude ±75m
• Air density ±2%
• Moisture content (water grains) ±10%
• Altitude ±15m

Operational Range

• Speed 0.6 to 60 m/s
• Temperature -45 to +125ºC
• Relative humidity 0 to 100%
• Pressure 10 to 1100mbar

Specification Range

• Speed 0.6 to 40 m/s
• Temperature -29 to +70ºC
• Relative humidity 5 to 95%
• Pressure 750 to 1100mbar

Available options:

• Bluetooth model

Kestrel 4250 features: What makes a Kestrel Unique?

• Multifunction instrument
• Graphical displays
• Data capture up to 3600 readings
• Minimum/maximum/average values
• User defined screens
• Language selection
• Small robust design
• High accuracy
• High precision axle and low-friction Zytel® bearings
• Fast response temperature sensor
• User replaceable impeller
• Easy to read back-lit display
• Hard cover protects impeller
• Runs from 2 AAA batteries
• Data upload (with optional PC interface or integrated Bluetooth wireless technology)
• Available in safety orange
• 5 year warranty

Typical applications

• Motor racing weather monitoring for race car tune-up
• Jet engine tuning
• Drag racing

Additional Information