Twister Banner Brackets

The Twister Banner Brackets have been designed with flexibility to reduce loading on lampposts by up to 88%.

This system allows your banner to withstand large wind loadings and helps protect banners from twisting and tearing.

Due to the fantastic design you can fit these brackets to lampposts, walls and fencing.

This system complies with British Standards EN 40 & EU Standards EN 40.

Constructed from 2 pieces of gravity cast aluminium, and unique spring loaded arm system.

Each system consists of 1 pair of twister brackets to take a banner up to 800mm x 3000mm

This system has been fully wind tested please see below for the results.

Test results

Lamppost twister brackets were developed for reducing wind loading on lamppost caused by the installation of banners.

Testing carried on a single lamppost column with
1 Banners - 76cms x 203cms approx total 1.54sq.m.
2 sets of Lamppost Twister Brackets
Fixings

Methods and Apparatus used
• Distance travelled was recorded on two string pot sensors mounted on the test rig and were calibrated by wrapping the wire around two known diameters and calculating the circumference
• Wind speed was provided by our test facility.
Test Procedure
all tests were conducted with specialist equipment for measuring wind loading vs deflection. The test was carried out with double banners on a lamppost column.
• Record Static Conditions
• Start wind tunnel and record base wind speed, force on banner pole, and deflection. Wind speeds were held for two minutes while increasing wind speed at 10mph increments.

Loading Results
Lamppost Twister Bracket max loading of 63.42kgs @ 50mph

Results
Linearity of the load cell is 0.57kgs max up to 63.42kgs.
Load reduction starts occurring between 25 and 40mph.
Wind force overcame the spring force of the system at the above speed, the lamppost Twister bracket changed direction of the banner according to the direction of wind. The banner rotated to degree that at 70mph some which started in a perpendicular position to the wind direction, billowed and turned such that over 70mph the middle of the banners were actually partially hidden behind the pole. This rotation was very significant in reducing the exposed area to the wind velocity and limiting the force to the pole.

Calculated Reduction in Area
Calculated using A = F / 1/2pCdu2, where reduction in area % was calculated at 90mph or 144.84kmph.

Reduction in Loading Area 87.98%

In tests this equals to 0.4 square meter. Wind loading for 1off banners on 1 lamppost
Please note single banner installations needed to be adjusted down accordingly.