Sandaysoft

I have mine mounted the top of a 20' aluminum flag pole. No guy wires, it sways, no harm data runs very close to airport 2 miles away. Of course in a windy storm above 30 mph, I take the flag down and the sensors ride it out.

Out of interest then - is it sitting on top of the ground or embedded in concrete, sitting in a stirrup embedded in concrete? And, from the photo, appears to also be stayed to a post roughly 2 metres high? IOW - the base *appears* to be rigidly fixed.

Also keep in mind that you are using a structure designed for this purpose - the pole previously discussed here are not designed for vertical mounting - they are intended for rigidly being fixed to a building to carry something inside them.

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Punctuation is the difference between 'Let's eat, grandma' and 'Let's eat grandma'

Serowe,

Sorry, but I am not being notified of replies to my posts.

The flag pole which is 20' (6.096 m) in height is in a PVC tube sunk in rock approximately 18" (45.72 cm). The pole can be removed for changing the batteries in the sensor station. At 2 and 5 feet up is a clamp which is tied into the fence behind it. The remaining 15' of pole is unsupported. I have a bent pipe at the top to adapt the pole to the sensor station pipe secured with two stainless steel hose clamps.

My post was in regard to other posts talking about resistance of round and square posts and the bending under stress. Last night this pole, with flag up, sustained 35 mile per hour gusts with out any problems. BTW pole is 2.25 inches in diameter and about .094 inches wall thickness, so it is not very heavy duty.

I am not saying that for some installations guy wire should be used, just not necessarily for 2 meter pipe.

BBQSteve

Thanksa for that - and I agree about 2 metre poles not requiring stabilising. 5 metre poles, which has been discussed here, are a completely different kettle of fish though.

Also - the difference between what you have, and others are contemplating - proper ground 'mounting' and diameter of the pipe itself.

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Punctuation is the difference between 'Let's eat, grandma' and 'Let's eat grandma'

I think I am going to just go with a thinner pole 2500mm long
http://www.aluminiumwarehouse.co.uk/Alu ... _info.html
attached to my current pole (which is about 3000mm long 40mm dia alu).

I will have it overlap by about 2000mm so it will only extend a further 500mm just to give me
a little bit more height, and avoid being instable.

The current main pole is attached to my shed via two mounting brackets
so hopefully this will be enought not to have swaying.

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Cumulus Real Time Data Grabber
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Wokingham Berkshire - weather station
http://www.wokinghamweather.co.uk

MRD Photography
http://www.mrdphotography.co.uk

Putting the additional weight on the existing pole - suggest you put at least another retaining bracket lower down - not knowing how much of the original pole you have that is currently bracketed, you should have at least the first 1 1/2 metres retained by brackets so another in between will certainly help.

Also - as your original pole is 40mm in diameter an the one you are adding only 25.4 (ie 1 inch) - you are going to have to use additional very secure brackets to join the two - otherwise you *will* start to see the new, smaller diameter pole, start to move (again this has come from experience where I had to attach a 1.5 metre wireless pole antenna to steel vertical pipes to gain height - they were 50 mm, the antenna 25 mm - and even in a very light breeze, no matter how we tied them together - meta; brackets, cable ties, tape, you name it, after a few hours the antenna was always startig to lean over from the vertical. The *only* way we could overcome this was to buy special mounting brackets designed for this purpose).

_________________
Punctuation is the difference between 'Let's eat, grandma' and 'Let's eat grandma'