Introduction to U4H

The U4H eScore target is a next generation electronic target based on acoustic sensors. It works with supersonic ammunition, but will detect projectiles even as they go subsonic.  It is designed to be used for 200-600 m/yds shooting ranges, particularly suited for long range shooting.

Full target line intallation is described in this video.

Features of the U4H target

• All sensors and electronics in the bottom of the target - to be easily protected.
• Closed chamber acoustic detection system, unaffected by weather conditions.
• Several different target faces available.
• Guide pin design allows swift change of target face, without need for subsequent zero point alignement.

Technical specifications and dimensions

A	1822 mm
B	1826 mm
C	559 mm
D	305 mm
E	80 mm
F	40 mm
G	95 mm
H	164 mm

Below are target leg dimmensions, referenced by the lower part of the service panel:

Exploded view and parts list

Below is an exploded view of the components used for the H3H eScore target.

Note1: This guide pin will cause challenges to install X-rubber at one side of the target. The other guide pin is recommended.

Note2: This target face is used in combination with following printed taget faces (attached with velcro):

Target rubbers

The target is fitted with a target rubber skin (both at the front of the target frame and at the back) and a X-rubber to obtain a soundproof measuring chamber in between. The target rubber skin at front of the target is fitted with a Ø60cm (Ø24'') hole in the centre section, to reduce wear affecting scoring accuracy.

To keep a sound proof measuring chamber, and ease maintenance, the target is fitted with a X-rubber. The X-rubber is hung at four fixation pins as illustrated, and the rubber sheet of the X-rubber should always touch and cover the hole in the target rubber skin. 

When the rear target rubber skin get coin-sized holes by wear, the rear target rubbes skin should also get prepared with a Ø60cm (Ø24'') cut-out. Keep in mind that the target rubber skin is stretched when mounted to the target, and that the cut-out will be larger than a guide mark. We suggest Ø58cm (Ø23'') guide mark.

Worn X-rubbers should always be put at the back of the target (touching rear target rubber skin) to cover holes in the rear target rubber skin - when new X-rubbers are put at the front of the target. The quality of the X-rubber and target rubber skin, particularly in front of the target, are of major concern in maintaining scoring accuracy.  

Disassembly

See exploded view figure above.

Target assembly must be disassembled when doing maintenance. Top cover is attached to target with Velcro, and is simply pulled up to be picked off. Other parts can be picked off after unscrewing guide pin nuts.

U4H target maintenance

U-Target inspection

 

Repair ricochet damages to target rubber skin

In the event of projectiles passing through the target as they are tilted or otherwise deformed, they may generate large holes in the target rubber skins. 

If the large holes occur in the X-rubber, scoring issues are prevented by exchanging it.

If the large holes occur at the main target rubber skin, outside the X-rubber, the holes need to be patched. This is done by spray glue and a piece of adhesive tape, or fast curing super glue and a piece of rubber.

 

 

 

Inspecting the target rubber skin

The target rubber skin need to be replaced in these events:

1.	Excess wear (large number of shot holes) at target rubber skin will affect scoring accuracy. This is especially important at the edge of the cut-out of the target rubber skin. This phenomena is particularly bad when the rubber sheet doesn't hold together, and coin sized parts start dangling.
2.	As the target rubber skin is aging, its tensile strength will degrade. The target measuring chamber (between the target rubber skins) may eventually implode if the target is subjected to wind. Implosions can be temporarily be fixed by detaching, stretching and reattaching the target rubber skin.
3.	As the target rubber skin is aging, it will eventually start to crack. Cracks may become holes and compromise the sound proof measuring chamber.

 

 

Cleaning sensos

Rubber particles and debris will fall to the bottom of the target. Some will pile at the sensors. 

It is recommended to clean the sensors at 3000 shots intervals, or before competitions. Cleaning is done with a soft brush, brushing off particles at the sensor heads. 

Warning!

Do not use excess forse when brushing, thus dislocating the sensors.

 

Target service panel at the bottom of the target need to be opened to access the sensors (sensor bar). To open the service panel, FX target face and (lower) temperature shield first need to be removed from target. Also two rubber straps at the hatch need to be taken off. Please remember to put them back after cleaning.

 

 

 

Inspecting the target face

Target faces are worn by penetrating projectiles. They should be replaced if they provide a poor target profile for the shooter. Fixation nuts (at front of the target) must be taken off before replacing target face - if they are not attached with velcro (see parts list). 

 

 

 

Inspecting the target service panel

The lower part of the target has a service panel that can be opened to access the target electronics and the lower sensors. Opening and closing is done by operting the white rubber straps at the bottom of the target. 

Inspect the physical integrity of the service panel and its hinges/straps, and check that it's possible to close completely. There should be no cracks that sound can  “leak” through when the service panel is closed. Always keep the service panel closed and strapped, expect when servicing or inspecting the internals of the target.

 

 

 

Target repairs

Repairs

Target I/O cables, at the bottom of the target, can easily be replaced when the front target service panel is opened. The I/O cables have connectors at both ends, one for connection to the scoring system, and one for connection to the target electronics inside the target. 

I/O cables are lead through a track in the target frame, and put in a loop just inside the target frame. They are attached to the taget frame with duct tape, cable ties and cable clips. Make sure that the cable loop doesn't touch the nearby sensor.

 

 

Protecting the U4H Target

How to protect the target from stray bullets and ricochets

Protecting the targets

The targets have the most critical, or all, electronic components located at the bottom of the target - behind the service panel. To minimize maintenance cost and maintain the target durability it is recommended to protect this section of the target by use of a knee wall or protective plates. Target stands with protective plates are available on request.

Please refer to this YouTube video for recommendations on how to install the targets.

 

Protection from ricochets and shrapnel

Some shooting ranges have backstop that create shrapnel when bullets hit bullet catchers. This should be avoided since cables may be cut or short circuited by shrapnel or bullet jackets. To minimize the effects careful placement of the wiring between targets, antennas, batteries etc. must be done. If steel bullet catcher is used, make sure to cover it with rubber material or other absorbent material to minimize ricochets and shrapnel exiting the bullet catcher.