WXforum.net

Miscellaneous Debris => Weather sensors, design, analysis, discussion, home brew => Tech Corner => Anemometers => Topic started by: Old Tele man on September 01, 2017, 06:56:19 PM

Title: A Pitot-tube windspeed...maybe?
Post by: Old Tele man on September 01, 2017, 06:56:19 PM
Anybody seen this before?

(http://www.eagletreesystems.com/image/cache/data/air-micro-v3%20(1)-280x280.jpg)

• Manual: http://www.eagletreesystems.com/Manuals/airspeed-v3.pdf (http://www.eagletreesystems.com/Manuals/airspeed-v3.pdf)

Another device: https://developer.sensirion.com/applications/directional-wind-meter-using-sdp3x/ (https://developer.sensirion.com/applications/directional-wind-meter-using-sdp3x/)
Title: Re: A Pitot-tube windspeed...maybe?
Post by: CW2274 on September 01, 2017, 07:12:24 PM
Measures airspeed from  9 MPH to 350 MPH (15KPH to 563KPH)
If you need this where you live, I don't want to be there.....Oh wait, I do.... :-P
Title: Re: A Pitot-tube windspeed...maybe?
Post by: Old Tele man on September 01, 2017, 07:19:08 PM
Measures airspeed from  9 MPH to 350 MPH (15KPH to 563KPH)
If you need this where you live, I don't want to be there.....Oh wait, I do.... :-P
Guilty...by proximity!
Title: Re: A Pitot-tube windspeed...maybe?
Post by: vreihen on September 01, 2017, 08:27:39 PM
This picture was the first thing that came to mind:

(http://www.sportys.com/media/catalog/product/6/6/6633_002_1.jpg)

If pilots are covering pitot tubes between flights to keep dirt/bugs out, how suitable are they for use in a 24/7 weather station which we all know are magnets for both...and also birds?

Probably passable in a handheld portable wind meter, though.....
Title: Re: A Pitot-tube windspeed...maybe?
Post by: Old Tele man on September 01, 2017, 08:43:47 PM
I was thinking more about a "combined" wind VANE (direction) and ANEMOMETER (velocity)...basically an 'aircraft pitot tube wind vane'.

And, the reason pilots always cover/protect the pitot tube is because their LIFE depends upon it working 100% all the time, so it's protected until in actual use, ie: flight time.
Title: Re: A Pitot-tube windspeed...maybe?
Post by: CW2274 on September 01, 2017, 09:11:42 PM
And, the reason pilots always cover/protect the pitot tube is because their LIFE depends upon it working 100% all the time, so it's protected until in actual use, ie: flight time.
I was flying with my dad when I was 10ish and the pitot wasn't working upon landing. I didn't get it then, but the trouble in my dad's face was not good, landing was over power lines on a short grass runway...all I remember is the stall warning horn constantly blasting, til he put it down. That was fun... :shock:
Title: Re: A Pitot-tube windspeed...maybe?
Post by: vreihen on September 02, 2017, 09:44:25 AM
There was a fatal crash on takeoff from our local small airport several years ago.  Accident investigators found the "remove before flight" ribbon and pitot tube cover still in place.  #-o

Just speculating that the reason why pitot tubes are not commonly used in fixed-location weather stations is because they are vulnerable to being obstructed by environmental elements like bugs, dirt, water/ice, etc.....
Title: Re: A Pitot-tube windspeed...maybe?
Post by: Old Tele man on September 02, 2017, 12:37:50 PM
There was a fatal crash on takeoff from our local small airport several years ago.  Accident investigators found the "remove before flight" ribbon and pitot tube cover still in place.  #-o

Just speculating that the reason why pitot tubes are not commonly used in fixed-location weather stations is because they are vulnerable to being obstructed by environmental elements like bugs, dirt, water/ice, etc.....
Pitot "icing" was the cause of the B2 bomber crash at Anderson AFB on Guam.
Title: Re: A Pitot-tube windspeed...maybe?
Post by: Old Tele man on September 05, 2017, 07:01:59 PM
Just received this info from Dwyer Instruments in response to my question about using a pitot-tube for "home" weather measurement:

http://www.dwyer-inst.com/PDF_files/2017/INTL/Mark_II_WSI.i.pdf (http://www.dwyer-inst.com/PDF_files/2017/INTL/Mark_II_WSI.i.pdf)
Title: Re: A Pitot-tube windspeed...maybe?
Post by: CW2274 on September 05, 2017, 07:33:15 PM
Just received this info from Dwyer Instruments in response to my question about using a pitot-tube for "home" weather measurement:

http://www.dwyer-inst.com/PDF_files/2017/INTL/Mark_II_WSI.i.pdf (http://www.dwyer-inst.com/PDF_files/2017/INTL/Mark_II_WSI.i.pdf)
Wow, does this remind me of being a kid again! I wanted one of these bad in the early 70's. Shocked they're still making this.
Thanks for the flashback!