CLARK MASTS - PORTABLE MASTSClark Masts Air-operated logo
Australian Distributors: Portable Masts Australia Pty Ltd - Contact Details

A BRIEF GUIDE TO CLARK MASTS MAST MOUNTING OPTIONS

The following notes are intended to outline the principal ways of mounting a Clark Masts portable mast. For each method Clark Masts produces a full range of accessories and assisting ancillary equipment. Details on the range of these and other accessories which are available from Australian Distributor, Portable Masts Australia Pty Ltd, can be obtained by E-mailing Portable Masts Australia Pty Ltd.

Clark Masts Mounting Options - Tripod Supported Field Masts TRIPOD SUPPORTED CLARK MASTS 
FIELD MOUNTED PORTABLE MASTS


In this case stability is provided by the rigidly attached
legs and the weight of the leg/mast assembly. May be
used standing on hard surfaces without guys or
spikes. Can have top guys added if an antenna with a
large side area is to be supported and winds are
expected. For details on Tripods see the
Mast
Accessories
web page.
GUY SUPPORTED FIELD MOUNTED 
PORTABLE CLARK MASTS


Here the retracted portable mast is set up and supported in a
vertical position by guys fixed to the top of the base
tube and to ground pickets. Top guys can be attached
and secured to the pickets after extension. This
arrangement can only be used on ground into which
pickets can be driven. For details on Guys and
pickets see the
Mast Accessories web page.
Clark Masts Mounting Options - Guy Supported Field Masts
Clark Masts Mounting Options - In-vehicle Mounted Masts, with and without mast leveling SHORT RETRACTED VEHICLE OR SHELTER 
MOUNTED
CLARK MASTS PORTABLE MASTS

When the mast is less than 2.5 metres retracted, it may be
mounted vertically, inside (A) or outside (B) the vehicle.
In most case guys are needed only occasionally. Although
10 degrees of mast inclination should not be a problem,
the arrangement in B may be provided with
adjustable mountings which enable the mast to be set
vertical on sloping ground. For details on Adjustable
Mounts
E-Mail
Portable Masts Australia Pty Ltd
LONG RETRACTED VEHICLE OR SHELTER 
MOUNTED PORTABLE CLARK MASTS


When the retracted length of the mast is too long for
using the above system, the portable mast must be
transported horizontally and set vertical for extension.
Special easy to swing roof racks and trolleys are part
of the Clark Masts mounting accessories range. For
details on Roof Trolleys see the
Mast
Accessories web page.
Clark Masts Mounting Options - Roof Trolley Mounted Masts


CLARK MAST PORTABLE MAST GUYING INFORMATION
Guys may be simple wires or ropes connecting levels of a mast to ground attachment points. 
The use of guys on a Clark Masts portable mast can be twofold.

In the first case guys are an indispensable part of the portable mast structure. In the second case the Clark Mast portable 
mast itself is self supporting and the guys are there only to provide the mast with stability. Most Clark Masts telescopic portable 
masts are of the second type.

Guys can be constructed from a number of different materials. Steel cable is very effective but suffers from the 
disadvantage of being difficult to reel and handle. Stainless Steel is sometimes specified but can suffer the same 
damage in use as cheaper galvanised steel. Polyester (Terylene) has the advantage of being easy to reel and handle 
without damage, but has the disadvantage of high elasticity. Polymide (Kevlar) is straight fibred and much less elastic, 
but a little more difficult to knot and terminate. Debeglass is a non-conductive continuous filament
PVC sheathed guy wire that does not elongate and is lighter than steel for the same strength. Clark Masts,
through Australian Distributor Portable Masts Australia Pty Ltd, can supply all four types according
to application, steel being to special order and Debeglass normally being a stock item.

All of Clark Masts Terylene and Kevlar Guy Assemblies have their ends terminated with easy attachment snap hooks and 
ball tensioners. They also come with an attached, simple to use guy reel. A number of different Guy Pickets are
available to suit a range of ground types. E-mail
Portable Masts Australia Pty Ltd for details.

Guying can be at 120 or 90 degrees. The advantage of 120 degree guying is the three quarter weight of the guy 
assemblies and pickets, plus less pickets to drive into the ground. Disadvantage is that picket spacing accuracy is important. 
Guys at 90 degrees require one extra picket to be driven, but picket position is less critical. 

While Clark Masts QT portable masts are fitted with collars for 3 way guying at 120 degrees, all other standard Clark Masts portable 
mast guy collars allow for both 3 way guying at 120 degrees or 4 way guying at 90 degrees.
SHOWN AT RIGHT IS THE RELATIONSHIP BETWEEN
GUY TENSION AND THE HORIZONTAL STABILISING 
FORCE AT THE TOP OF THE MAST.

HANDY CLARK MAST PORTABLE 
MAST GUYING INFORMATION


Breaking Strength of Debeglass 4 mm dia. - 430 Kg
Breaking Strength of Debeglass 5 mm dia. - 620 Kg
Breaking Strength of Debeglass 6 mm dia. - 970 Kg

Breaking Strength of Terylene 5 mm dia. - 600 Kg
Breaking Strength of Steel Cable 2 mm dia. (6x7
construction) - 240 Kg
Breaking Strength of Steel Cable 3 mm dia. (6x19
construction) - 500 Kg
Breaking Strength of Kevlar 6 mm dia. - 1210 Kg, Weight
of Kevlar in Kg/100m - 3.08 Kg

Guys are necessary to stabilise a mast and increase its
resistance to side loads. Tensions used should be
minimum necessary to give stability in the winds likely
to be encountered. Excessive tensions only increase
downloads on the mast itself. The main tensions in the
guys will be automatically generated by the attempted
movement of the mast in the wind. Low modulus guys
(e.g. Terylene) can never stabilise as effectively as high
modulus guys (e.g. Debeglass, Kevlar or Steel) except in
excessive pre-tensioning. For details on Guying
Assemblies see the
Mast Accessories web page.

Clark Masts - Mast Guying Information
Recommended Guying Picket Radius for Clark Masts 
Phase 2 Masts
Clark Masts - Guy Picket Radius


CLARK MASTS HEADLOAD MOUNTING 
SPIGOT DETAILS
Clark Masts - Headload Mounting Spigot Details CLARK MASTS PORTABLE MAST 
HEADLOAD MOUNTING SPIGOT SIZES


All Clark Masts are fitted with the standard NATO mast
socket of either 24 mm or 40 mm nominal internal
diameter. The recommended spigot sizes to match
these sockets are shown opposite. These sockets
incorporate a quick clamp designed to hold the
headload securely when clamped, yet instantly
release when unclamped. For details on optional
Headload Mounting Adaptors incorporating
24 or 40 mm spigots see the
Mast Accessories
web page.

For details on Clark Masts full range of mast accessories contact Clark Masts Australian Distributor Portable Masts Australia Pty Ltd

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Phone: +61 402130692
Mob: 0402130692

For full Technical details and pricing E-mail Portable Masts Australia Pty Ltd

This page was last updated 14-01-2017


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