In 1949 Penketh’s Heavy Anti Aircraft gun Battery was selected for Orange Yeoman Trials and also included 5 other gun sites in the Trials.
The gun sights included Crank [MY10] Altcar [MY66] Norley [MY39] Flint [MY45] Thurstaston [MY24] and Penketh [MY76].
Two pairs of lines were connected from each gun site to the Orange Yeoman Tactical Control Radar and Data Handling Centre at Newton Hollow, Newton near Frodsham, Cheshire.
The radar Head at Newton Hollow was of the Number 4 mark V11 Type which was known as Orange Yeoman, supplemented by a new number 11 Predictor with a detection range of 100,000 Yards and a height of 60,000 feet and the ability to give radar information directly to the gun sites, using an automatic data transmission system.
Using data from the radar, the predictor was able to calculate the target Trajectories and feed the information directly to the gun sites.
The Penketh heavy anti-aircraft gun battery is located on the north side of South lane the A5080 road at Penketh Warrington.
Legend
1 Surviving WW2 Emplacements X 3
2 Surviving Post WW2 Emplacements X 2
3 West & East Ammunition Magazines WW2 (2 Buildings)
4 WW2 Command Post
5 WW2 Generator Building
6 Post WW2 Command Post
7 Remains of GL Mark 2 Gun Laying Radar Hard Standings Post WW2
8 Remains of Camp Barracks
The WW2 Height & Predictor Instruments.
These instruments were located on the roof of the ww2 command post.
The height and range finder instrument consisted of two telescopes placed in a long – base tube.
The operators looked through the eyepieces and pinpointed the aircraft, noting the hight and range, and sent this information to the predictor crew.
The predictor instrument would calculate how far in front of the aircraft the shell should explode to knock the aircraft off course, taking account of the speed as well as the information received from the height and range finder.
The crew would look through the eyepieces and see a small image of the aircraft and turn dials to keep the image in place, and as soon as they were on target, the information would automatically be feed to the gun emplacements.
ATS girls using the predictor instrument

ATS girls using the height and range finder

Post WW2 3.7 INCH gun emplacement illustration.


East elevation of the WW2 semi-sunken
command post plotting room.
Basement entrance of the ground floor
flooded command plotting room
The WW2 east ammunition magazine, retained post WW2
The WW2 electrical generator building, retained post WW2
The WW2 west ammunition magazine, retained post WW2
WW2 Gun emplacement on the
northern end of the site.
This emplacement has been modified
with the addition of an engine room.
The electrical steel conduit can still
be seen on the right-hand wall.
The WW2 east ammunition magazine, retained post WW2.
The post WW2 command post
built during the site refit period.
The WW2 command post was disused when
the new command post became operational.
The post WW2 command post as you can see the
building is now being used as horse stables.
The post WW2 command post.
The remains of the post WW2 radar hard-standings.
The remains of the camp barracks buildings foundations
the WW2 water tower in the background.
The foundations of the champ barracks the building top left have no
connection with the site, it is an abandoned chicken farm.
Steps down to the WW2 command plotting rooms

New post WW2 gun emplacement to
the north of the site heavily overgrown
New post WW2 gun emplacement to the north of the site
New post WW2 gun emplacement to the north of the site
Gunning Placement Engine House
WW2 Emplacement which has been modified with the addition of an engine room on the right of the photo. This is on the East side of the site.
Post WW2 Gunning Placement on the Northern end of the site.
This emplacement is now heavily overgrown and was difficult to photo
West Ammunition Magazine Taken From The Roof of The Command Post
Inside 1 of the Rooms of The Ammunition Magazine
Post WW2 Emplacement at the Northern end of the site.
In the Foreground of the Photo and
to the right is the enclosure of the
height and range finder instrument.
And in the background is the West ammunition
3.7 INCH gun emplacement on the east of the
site photo taken on the roof of the engine room
The same emplacement, the world war 2
ammunition Lockers have been retained.
world war 2 emplacements had 6 lockers
and post world war emplacements had 4.
Same emplacement taken at a different angle.
Same emplacement looking east.
As you can see the WW2 emplacement has been
modified with the addition of a crew room in
the foreground to the left and an engine
room in the foreground right.
Same emplacement showing the holdfast metal
studs and trunking between the engine room and the gun.
The engine room was installed with an electric motor driving a hydraulic
pump to train the gun and the automatic loading mechanisms of the gun.
The roof of the ww2 semi-sunken plotting room
The WW2 command post in the foreground to the right was the
predictor and the square open area behind was for the height finder.
In the background can be seen the west ammunition
magazine and the electrical generator building.
These are the steps down to the WW2 semi-sunken plotting room.
Ground level room adjacent to the flooded plotting room































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