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I have tried to build one of the old thermistor types with low succss. By chance at a local electronics store I cam across a co called Extech and their instruments. Two look interesting, Part 451158 Min-Thermo-Anemometerplus humidity and part # RH520 Hum-Temp Chart Recorder. I am not knowleable about the subject to know if they will work and they are pricey! Any ideas anyone?
If not this way anyone have a new old type plan?FAI Model Supply has a pretty decent thermistor thermal detector for $23.00. I’ve used mine for several years with pretty good sucess. Temperture read out is in tens of a degree.
EdIts important to have a fast sampling system. If it only resets every 60 secs it won’t help.
A thermistor hooked to an Ohm meter will work.
I use the one from FAI supply.Dan & Ed,
Tks for the follow up. Will check on the sample rates but the FAI idea looks good, will purcase one.
Cheers.Peter Birch (RIP) made a great Thermal Detector that we used at the WFFC in France with impressive results. It was wind-up clockwork powered for the drum chart with 2 pens with lines showing ups and downs in temperature as well as wind velocity. You could see the whole history on the paper for about 1/2 hour back.
Had batteries to power 2 servos to move the pens.
I’ve lost posession of this great machine.
What is there on the market that can do this? Electronic or otherwise.thermals,
Dick Bertrand
Guatemala@Dick Bertrand wrote:
Peter Birch (RIP) made a great Thermal Detector that we used at the WFFC in France with impressive results. It was wind-up clockwork powered for the drum chart with 2 pens with lines showing ups and downs in temperature as well as wind velocity. You could see the whole history on the paper for about 1/2 hour back.
Had batteries to power 2 servos to move the pens.
I’ve lost posession of this great machine.
What is there on the market that can do this? Electronic or otherwise.thermals,
Dick Bertrand
Guatemalayes they are/were avaiable but,,,,,
why not get hold of the 2011 BMFA free flight forum report and with that you can build your own .
I did an artical in there about the one i made,it has paper roll chart,pens to record temp and windspeed and the sensors are placed up wind with a radio link.
You DO NOT need electronic Knowledge to build this.Thanks,
How can I get a copy?
Also where are they sold (if they are)
Thermals,
Dick Bertrand
GuatemalaYou can get a copy from martindilly@compuserve.com
It should cost you 14.00 British pounds including airmail.
Pim Ruyter of tracker fame has made them (his design) but when I asked him about buying one,a couple of years ago he said he was no longer making them.It was then that i thought about doing my own.
Leonid Fuzeyev has also made a very good one in the past, not sure if he still does. I have no contact details for him but no doubt someone has !!!!
If you do go ahead with my version in the forum i can help if you wish,I have made improvments since publication.It now has selective sensitivity.
By the way,why do you need one,are there free flight competitions in Guatemala
Cheers PeteWould you have a copy you could send me email? That would save bucks. It’s just your article I want.
A good friend, Julio Quevedo is repairing the one that Peter Birch made that worked so well.
I think I’ll go that route.
We have no flying of FF in Guatemala right now. Can’t find an all-weather flying field.
However, I’m going to the Nats to fly and the WFFC FAI champs in France in 2013.
The advantage of residing in a small country is you’re always on the TEAM!!!Thermals,
Dick Bertrand in Guatemala
Well, Julio Quevedo did a nice job on putting the electronics in shape on Peter Birch’s
machine and I have it back now.
I need the 4 cup thing that goes around to measure wind speed and the temperature sensor also.
Where can I get these things?
Truth is, the whole project is over my head.
What I really want is an ELECTRONIC DATA LOGGER that does these things.
READY TO GO.
I’ve looked on the internet with no results yet.
Can anyone help on this?
Thanks
See you down wind!
Dick Bertrand in GuatemalaFound this old thread.
Is there any more info or updates on other thermal chart recorders? Photos?
I made up my own in 1988. Unfortunately, my electronic assembly skills were not great, and over time it went bad, poor solder joints. Eventually it just quit working, in 2002. I tried to make a new control box, but ran into a brick wall.
I’d really like to get it going again. Keeping the same paper drive and servo driven pens, but with a new control box.
Here’s a link to info on the one I made, and some pics from that web page:
http://georgesrockets.com/GRP/Articles/thermal_recorder/thermal_recorder.htm
– George Gassaway
Thanks George,
Thats a good packet of valuable information.
The two guys who designed the detector we used in Thouars in 1987 WFFC were Peter Birch (RIP) and Julio Quevedo from here in Guatemala.
Julio has now re-designed it with an electric motor driving the previous clockwork drum for the graph paper and some new electronics.
I haven’t used it yet, but I hope it’s simple and not complicated.
I plan to take it to the Nats in Muncie 2014 and will gladly give you feedback on how we do with it.
Where are you located?Thermals,
Dick Bertrand in Guatemala, but soon back to the US for retirement and renewingold friendships.
Dick is that the same unit you had at Reno in 1984 or one close to it.
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