Clark Masts - TYPE 73 - Military Field Mounted Portable Mast Series

For over 40 years Clark Masts Type 73 field mounted portable masts have been the communications backbone of many armies. The main features, such as the aluminium alloy mast sections, the winch system which controls the guys during erection, the 3-legged erection gear and the mast lifting hoist which made the first Type 73 portable mast unique, are still there today. Whilst the basic system has not changed, there have been many detail improvements. However, with each improvement the matter of interchangeability has not been neglected.

Clark Masts Type 73 is a field mounted portable mast system which operators rapidly understand and can erect with confidence, even in very adverse weather conditions. Type 73 portable masts are available as field deployable kits with extended heights of 10, 13, 16, 18, 21, 30 metres and vertical headload capabilities from 50 to 75 Kg having a horizontal component from 70 to 150 Kg.

CLARK MASTS 73 SERIES PORTABLE MAST BRIEF SPECIFICATION

Mast Section
Heat-treated light alloy to BS14171, 6082TF. Specially drawn and machined. Anodised to DEF STAN 03-25. Sections can be dyed green, gold or desert sand.

Aluminium Alloys
Castings in LM6 alloy to BS 1490, gravity diecast.

Steel
Where surface hardness is required, medium carbon steel to EN8D, HF induction hardened. Elsewhere EN 1a.

Finishes
Zinc plating and passivating to DEF STAN 03-20. Paint finishes to Military Green or other colours on demand.

Bag Materials
Nylon decontaminable cloth to UK/SC3501 with approved straps and buckles. Stiffening is by means of low density polyethylene removable plates inside the bag.

Guy Cable
Standard 6/9 galvanised steel to BS 3530. Stainless or nylon covered to ISO 2232 or Kevlar on demand.

Clark Masts Type 73 Portable Mast being deployed

Clark Masts Standard Type 73 Kit Components (Example here shows 10 Metre P/N 18130 mast)	Item	Part #	Title	Qty per Kit
	1	18201	Mast Guide Box	1
	2	10772	Step Assembly	4
	3	18020	Leg Assembly	3
	4	18114	Foot Assembly	3
	5	7600	Hoist	1
	6	13973	Hoist Support Bar	1
	7	5246	Lifting Block	1
	8	5426	Bubble Level	1
	9	5373	Foot Adjustment Brace	1
	10	18021	Guy Winch Kit (Leg Mounted)	1
	11	18037	Picket	3
	12	18039	Picket Clamp	3
	13	18034	Picket Driving Cap	1
	14	18033	Picket Extractor	1
	15	6409	Leg Spike	1
	16	18022	Guy Collar Set	1
	17	5231	Mast Section	7
	18	14522	Mast Section Carrier (3 Section)	1
	19	14523	Mast Section Carrier (4 Section)	1
	20	18150	Guy Radius Line	1
	21	18025	Winch Bag	1
	22	18026	Hoist Bag	1
	23	18027	Equipment Bag	1
	24	18031	Accessory Bag	1
	25	18035	Leg Bag	1
	26	18028	Picket Bag	1
	27	B12173	Hammer	1
	The number of mast sections, mast section carriers, pickets, guy collars, spikes etc varies according to the actual height of the Type 73 portable mast to be erected. The part numbers shown in the table above include all items needed for a 10 metre field mast kit, Part Number 18130
A Packed Clark Masts Type 73 Field Mounted Portable Mast Kit ready for transporting

BRIEF DESCRIPTION OF HOW THE CLARK MASTS TYPE 73 FIELD MOUNTED PORTABLE MAST SYSTEM WORKS

1. Three adjustable legs are attached to a central guide tube.

2. Tube sections are fed into the central guide tube and one by one lifted using a special hoist, thus building up the mast.

3. Guys are attached at levels determined by the maximum mast height and are held in controlled tension by the mechanical winch unit.

4. After erection the mast may be rotated through 360 degrees.

5. Retraction is the above procedure reversed.

Clark Masts Type 73 mast kits are now supplied with a picket equally suited for hard or soft ground. Also supplied is a device for easy picket extraction.

CLARK MASTS TYPE 73 FIELD MOUNTED
PORTABLE MAST KIT FEATURES

1. Pan climatic

2. Maximum component weight is generally less than 20 kilograms

3. Capability: 8 to 30 metres, headload up to 75 kilograms

4. Erection example 20 metres: three persons with typical antenna, 45 minutes

Clark Masts TYPE 73
Field Mounted Portable Mast Kit Optional Accessories

Performance of a 20 Metre Type 73 Portable Mast, P/N 18134
Number of operators required	1 per 10 metres of height
Time to erect with 2 operators	40 Minutes
Time to lower & store mast	30 Minutes
Maximum Vertical Headload	60 Kg
Maximum Horizontal Headload	100 Kg

Quick Jump Index to various Clark Mast Military mast Series
Type 73 Series	Type 73S Series	Series 90	DAF Field Mast Series	Air Supply Equipment
SCAM Series	Type PU	Surveyor Series	XT Series	WT Series
804 Heavy Duty Trailer Mounted Series	FT RM Tripod Masts	TekMast Series	Clark Teklite Portable Lighting Range	Commercial Masts Contents Page

Type 73 MECHANICALLY EXTENDED