Author Topic: Higher in the air  (Read 417 times)

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Offline Garagedude

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Higher in the air
« on: September 18, 2017, 09:55:57 PM »
My AW 900-IP is about 20 ft. in air. Will I gain much going higher? The trees and other houses are a good distance away from what I think is a long way?  Does the extra 13 ft. if I go higher make a difference? I'm going to get a pole from this company so its easier to work on by being telescopic? https://www.mgs4u.com/fiberglass-push-up-mast.htm
Any thoughts?
Thanks in advance,
Garagedude

Offline Garagedude

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Re: Higher in the air
« Reply #1 on: September 19, 2017, 05:04:45 PM »
Anyone? lol

Offline BeaverMeadow

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Re: Higher in the air
« Reply #2 on: September 19, 2017, 07:32:37 PM »
Would those extension poles be stiff enough to allow for accurate rainfall data or are you just mounting an anemometer that wouldn't be adversely affected by flex?

Offline Garagedude

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Re: Higher in the air
« Reply #3 on: September 19, 2017, 07:36:41 PM »
They are suppose to be stiff enough, hopefully

Offline CW2274

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Re: Higher in the air
« Reply #4 on: September 19, 2017, 07:53:11 PM »
They are suppose to be stiff enough, hopefully
Not to 'rain' on your parade, but to think you'll get accurate rain readings from a tipper that's 30+ ft. in the air, just ain't gonna happen. Even with guy-wires, the wind abruptly shaking the unit will cause false tips, let alone the wind literally blow the rain in, out, around the collector. Rain should be measured ~2-3 ft. AGL, certainly lower than what you propose. However, on the bright side, your anny will be loving it.
BTW, your temp/humidity will also be affected at that height.
Bottom line, the only thing that should be up there is your anemometer.
Davis Wireless VP2 SHT31 24hr 67CFM FARS
RW Tipper w/ CoCoRaHS

Offline DoctorKnow

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Re: Higher in the air
« Reply #5 on: September 19, 2017, 09:31:54 PM »
I second not recommending installing the array up there either, unless you are just interested in accurate wind data, because as CW2274 stated, the other data will be incorrect, and also servicing the system will be a pain.

Offline Garagedude

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Re: Higher in the air
« Reply #6 on: September 19, 2017, 11:33:14 PM »
Well,
 I cancelled my parade :-( guess I'll re-think this. So guess I could lower it then, LOL  Thanks guys for the honest but helpful knowledge.

Offline Bashy

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Re: Higher in the air
« Reply #7 on: September 20, 2017, 12:52:01 AM »
I am using a alloy telescopic mast 40mm top at about 10m up with steel guys x6,
i get no movement in wind, not even a shimmer when  a pigeon lands or takes off
Having said that, my bucket is not up there, i would never put it up there, too big
of an area for the wind to hit and in no way would i put an all in one up there.

I have just had a quick look at a video on your station, can you not separate the
sensors

ps, i read a paper with regrads to urban siting and this paper stated that there is
little difference to mounting the temp at 10m (see edit below),  5m compared
to the same results to an open area, therefore, if you are in a built up area then its
favorable to put the up there, more accurate than at the suggested height.

My temp is at 13ft and i see no difference between that (Davis) and the OS968 at
the suggested height at night time of which i was warned about.
Bear in mind that the suggested height of 2/3ft is for open ground, not ya backyard
Us backyarders have to make compromises here and there.

If you can, split it up, theres nothing to say you cannot mount the rain on the mast
lower down where there is no sway, but, i wouldnt go with fibreglass, they sway a
lot more than their steel or alloy counterparts.

EDIT

RE paragraph 3, I stand corrected its 5m not 10m, after many months of searching for
this paper again, i have finally found it

Paragraph 3.1  http://urban-climate.com/ITM04-Oke.pdf
« Last Edit: September 20, 2017, 01:11:40 AM by Bashy »
Kind regards
Bashy