Gap Filler Detail

1959 – National Archives of Canada


10-36-80/5 (A/CCE-2)

Ottawa, Ontario
23 October 1959

Headquarters,
United States Air Force,
ATTN: AFOCE,
Washington 25, DC

Reproducible Drawings and
Design Analysis of Gap Filler Towers

A number of Gap Filler towers are scheduled for construction as a part of the CADIN Programme in Canada. Eight to ten consultants will be site adapting the towers for 45 locations at approximately the same time.

The following prints have been obtained through our normal contacts with ADSID and GEEIA:

One (1) set prints of Erection and Shop Drawings for Tower AB467

One (1) set prints of Design Drawings for Tower AB554, ie extension for Tower AB509

MITRE, at the request of ADSID, is reported to be making transparencies of the Erection and Shop Drawings for Tower AB467.

In order to furnish the Consultants with a print of the towers to be used at each of the sites, we have an urgent requirement for transparencies of design drawings for Towers AB554 and AB509. It would also be most desirable to obtain a set of Technical Specifications for Towers AB467, AB554 and AB509.

Through experience in the past with towers erected in Canada, it has been found essential to have a complete copy of the design analysis of the structural, mechanical and electrical portions. The design analysis is used to determine whether or not revised or operational equipment can be placed on the tower at the same time the operational necessity for additional or changes in equipment is studied. The analysis is also desirable from a maintenance standpoint. The technical data contained in Enclosures 1 and 2 are on hand; however, this does not satisfy the requirement. The design analysis is required for Gap Filler Towers AB467, AB509 and AB554.

We will be most appreciative if the above information can be furnished at your earliest convenience.

The proprietory right on the information will be respected by the Department of National Defence.

Encl 2

(JW Griffith) G/C
for CAS.


Extract from RADC-TN-58-136
ASTIA Document No AD-148734
dated May 1958

Page 39-40

TOWER AB-509/FPS-14 (Temperate)

Detailed Description

Height: 28 1/2 feet from base of tower to antenna pedestal

Height extension: Tower height may be increased to 50, 75 or 100 feet by use of a temperate extension tower.

Base dimensions: 16 feet square

Top platform dimensions: 20 feet square

Enclosure dimensions: 12 ft x 12 ft x 9 ft, with 3-foot high windows beginning about 4 feet from the floor and extending around the enclosure.

Foundations: Installed on concrete foundations or an Extension Tower AB-16A/CPS

Special Equipment: No hoists

Design Loading

Wind loading: 75 knots with antenna upright, 87 knots with antenna folded.

Antenna Weight: 8000 lb

Equipment weight: 7000 lb on lower platform

Tower weight: 33,600 lb

Live load: 50,000 lbs on top platform, 18,000 lb on lower platform

Base Reactions

Maximum moment: 438,400 lb-ft at 75-knot wind (shear = 14,900 lb)

Maximum shear: 17,320 lb at 87-knot wind (moment - 423,200 lb)

Maximum Leg Loads

Thrust: 35,650 lb

Uplift: 9,400 lb

Supplier

Dresser Ideco Company, Columbus, Ohio

Procurement Data

DCP No 2 to Contract AF30(635)-6727

TOWER AB-554/FPS (Extension)

Detailed Description

Height: 75 feet, 50 feet or 25 feet

Base Dimensions: 20 ft 6 in, 19 ft 0 in, or 17 ft 6 in square respectively

Top Dimensions: 16 feet square for all heights

Special Equipment: Furnished with stairway to top

Design Loading

Identical to that of AB-16A/CPS

Supplier

Blaw-Knox Company, Blaw-Know Equipment Division, Pittsburgh, Pa

Procurement Data

Specification MIL-T-4964