Extreme Weather Meters .com — Kestrel 4500NV with Horus Atrag Ballistics

Kestrel 4500NV with Horus Atrag Ballistics

Kestrel Pocket Weather Meters and Horus Vision have partnered to provide a powerful shooting tool that combines the critical environmental data and targeting software solutions required for precision shooting -- all in one four-ounce pocket-sized unit. Previously, shooters would need to obtain environmental data from a Kestrel meter and then input that data into a PDA loaded with Horus ATrag ballistics software. Now, the Kestrel Ballistics Weather Tracker with Horus ATrag Software contains all of the necessary data and solutions in one device to minimize user workload and distraction. Plus, the Kestrel meter is IP67 waterproof and MIL-STD-810F rugged, allowing users to avoid the expense and weight of a ruggedized PDA.

The new unit allows users to load and customize multiple guns and rounds from the extensive proprietary Horus database. Simple, intuitive screens allow the user to create up to six targets customized for location, distance, direction, declination and winds. The Kestrel meter's highly accurate measuring and averaging of wind and digital compass for target bearing and wind direction assists in defining the target winds. Once these parameters are set, the Kestrel meter takes over - tracking the current met data and automatically updating the firing solution using Horus ATrag advanced proprietary algorithms and taking Coriolis and spin drift into account. No additional user input is required.

Specifications:

	Feature	Abbreviation	Units	Minimum	Maximum
Target	Active Targets	N/A	A through E	1	5
	Target Range	TR	yards	25	4000
	Target Range	TR	meters	23	3658
	Wind Direction	WD	o'clock	1	12
	Wind Direction	WD	degrees	0	360
	Wind Speed	WS1 or WS2	mph	0	50
			m/s	0	22
			km/h	0	80
			fps	0	73
			knots	0	43
	Direction of Fire	DoF	degrees	0	360
	Direction of Fire	DoF	o'clock	1	12
	Inclination Angle	Ideg	degrees	0	60
	Inclination Cosine	Icos	no units	1.000	0.500
	Target Speed	TS	mph	0	50
			m/s	0	22
			km/h	0	80
			fps	0	73
			knots	0	43
	Target Direction of Movement	TD	Left to Right OR Right to Left
Gun	Name Characters	N/A	0 through 9; A-Z; a-z; -+/.:&* and space
	Muzzle Velocity	MV	fps	300	4500
	Muzzle Velocity	MV	m/s	91	1372
	Ballistic Coefficient	BC	no units	0.100	2.000
	Bullet Weight	BW	grains	10	1500
	Bullet Weight	BW	grams	0.6	97.2
	Bullet Diameter	BD	inches	0.10	1.00
	Bullet Diameter	BD	mm	2.54	25.40
	Zero Range	ZR	yards	25	1000
	Zero Range	ZR	meters	23	914
	Bore Height	BH	inches	0.10	5.00
	Bore Height	BH	cm	0.25	12.70
	Rifling Twist	RT	inches/revolution	1.00	36.00
	Rifling Twist	RT	cm/revolution	2.54	91.44
	Twist Direction	RTd	Left OR Right
	Rifling	Click	/mil	1	10
			/tmoa	1	10
			/smoa*	1	10
Environment	Latitude	Lat	degrees	90S	90N
	Temperature	Temp	fahrenheit	-50	140
	Temperature	Temp	celsius	-46	60
	Station Pressure	SP	inHg	12.00	32.00
			mb	406.4	1083.6
			hPa	406.4	1083.6
			psi	5.89	15.72
	Relative Humidity	RH	%	1	100
	Density Altitude (computed)	Dalt	ft	-10732	32767
	Density Altitude (computed)	Dalt	meters	-3271	9987
	Coriolis	Coriol	Yes OR No

*smoa removed from code higher than v2042

About the 4500

For years our customers have been asking for wind direction along with wind speed. The Kestrel 4500 does just that with its built in digital compass. But it doesn’t stop there. It also calculates crosswind and headwind/tailwind with reference to a user-set target heading, and stores the information along with all the other environmental readings in its 1400 data point memory.

Pair the 4500 Wind Meter with the Kestrel Vane Mount and you have a data-logging weather station that sets up in seconds and rotates in the slightest of breezes. Did we mention that the whole kit is the ultimate in portability? It packs down into a 2 x 6 inch pouch and weighs under 8 ounces.

Military personnel and pilots flying in darkness are often concerned with preserving their night vision. Due to overwhelming demand from our military customers, the Kestrel NV line was added in 2005.

The Kestrel 4500NV is available with an Olive Drab case or a Desert Tan case. The unit has a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Additionally, NV backlights are also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations. This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.

It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night vision. Even a short burst of white, yellow, green or blue light “bleaches out” the rod cell photoreceptors in the eye and causes night blindness until the entire adaptation process can take place again. Light in the red spectrum does not cause this “bleaching out”, preventing night blindness and night vision fatigue.