Wind flags

[RLHBUSL]

Jerry,

Now that your giving away your hardware design, what will you be charging for a license to use your software? See you at the range sometime soon!

Ryan

 

[Jerry H]

That hardware design is prior art thus it is free for all. My designs are: sensor $150, cable assembly $175, optional ADC with software $250. The ADC and software are not neccessary for using the system. They provide a graphic view rather than a numeric display along with some other features and require the use of a netbook.

 

[j3x44]

Thanks to everyone for their input on the windflags.

 

[Fergus Bailey]

Barry Edgley in Australia makes the same flags for a quite a bit less money. I love em. Just had to make up extension poles for the LR stuff.

Just to set the record straight. Barry makes the Elliott/BRT flags under agreement for Stuart. Barry also makes a flag of his own design which does not have the 2 bearings of the BRT flag, and is therefore cheaper. You cannot buy the BRT flag that Seb is talking about for “quite a bit less money” from Barry.

 

[Stuart Elliott]

Fergus is correct. Our BRT windflags are manufactured for us by Barry. He has always made him own design as well ,which is a bit different. Has a different shape and no bearings.
He now also make a Wind Probe which we will be selling.

Our agent for the USA for the BRT Flags is Butch Lambert (Shadetree Engineering and Accuracy). Anywhere else in the world people can contact us.

Just for interest we have sold over 2,500 BRT windflags around the world in the last 5 or 6 years to some 20 countries

Stuart Elliott

 

[mks]

You could create a system to learn to read your legal flags without wasting barrel life and ammo. Here is a screen shot of the software and a sensor.

Interesting idea, but I wonder how IBS would interpret the legality of the electronic reader.

Could you describe how the software screen works? Is the black dot with red dots an image of the weighted flag position? Is the green crosshair where the software is telling you to aim to hit center bull? Very cool, thanks for sharing.

Keith

 

[mks]

One of the repeating themes in wind flag discussions is the question of where the wind has the most influence on a bullet's flight. The reason that I bring this up is that in order for Jerry's electronic flags to give reliable results, he had to solve this problem, and assign a number to the influence that each flag would have on the total reading.

The weighting for each flag can be worked out from equations in McCoy. Is that how you did it, Jerry?

 

[Jerry H]

You can not use this during actual competition in the IBS bag gun classes. The cross hair shows where to hold to hit center, if the rifle is zeroed for no wind. The red dot shows where the wind will place the bullet if aiming at center. The black dot is a marker for a chosen condition. The weighting was selected by trial and error and is set at the individual sensors. What are Mccoys equations? I'll test them to see if they actually work.

 

[Lawrence W.]

The weighting for each flag can be worked out from equations in McCoy. Is that how you did it, Jerry?

Jerry.

The McCoy system can be viewed at: http://bisonballistics.com/articles/modern-exterior-ballistics-by-robert-mccoy . It appears to be a ballistics program that that gives you bullet push to the nearest .100" and is similar to the Norma ballistics program at: http://www.norma.cc/javapage_US2.asp?Lang=2

MKS

Jerry is being very modest here, as the weighting relationship between the sensors is the holy grail of the entire system. Get the numbers wrong and the system is useless! I developed a spreadsheet that analyzed the wind push at every yard between 0 and 200 to the .001" and used those numbers as a starting point for weighting before fine tuning in the field. Jerry has been field testing numerical weighting for years and in the end we came out to within a few thousands of a millivolt of each other for our weightings.

 

[therifler]

fellas , maybe someday we'll evolve to the point where we just send our rifles off to a shoot . the guns can compete while we stay at home .when the gun comes back we find which gun won . T.R.

 

[chappo555]

Fergus is correct. Our BRT windflags are manufactured for us by Barry. He has always made him own design as well ,which is a bit different. Has a different shape and no bearings.
He now also make a Wind Probe which we will be selling.

Our agent for the USA for the BRT Flags is Butch Lambert (Shadetree Engineering and Accuracy). Anywhere else in the world people can contact us.

Just for interest we have sold over 2,500 BRT windflags around the world in the last 5 or 6 years to some 20 countries

Stuart Elliott

Sorry Stuart. No disrespect intended. Only used the mark 1 eyeball comparing my Edgley flags to a BRT two lanes over at Majura.

 

[mks]

You can not use this during actual competition in the IBS bag gun classes. The cross hair shows where to hold to hit center, if the rifle is zeroed for no wind. The red dot shows where the wind will place the bullet if aiming at center. The black dot is a marker for a chosen condition. The weighting was selected by trial and error and is set at the individual sensors. What are Mccoys equations? I'll test them to see if they actually work.

Jerry,
McCoy's equation 7.30 is the one you need. Example 7.2 works out the crosswind weighting for the M2 30 cal bullet, which is shown in Table 7.2 and Figure 7.3.
It will be interesting to see how well the calculations agree with your empirically derived weights.

Cheers,
Keith

 

[Wilbur]

Hello: Can anyone give me advise on choosing the most accurate wind flags,does any of them have scale to read wind speed.

All wind flags have "scales" to read wind speed - some are just more obvious than others. The flags with simple "tails" could be considered analog and the flags with numbered scales could be considered digital. We find ouselves looking for a pattern with the analog flags and specific values with the digital flags. Either is adequate given a good rifle, some sighter shots, and a bit of intelligence.

 

[Pete Wass]

BRT Flags:

One of the lads in the group of folks I shot with this past winter has a set of BRT flags. In my opinion, they were the easiest flags on the field to read I have seen so far. He uses a Probe Like device to show him velocity and he shoots very well over them. He is one of the top shooters in the country so they ain't hurting him any.

I have 3 seperte sets of flags and am building another. I probably should sell all of those I have and buy a set of the BRT's but I just love finding them Windmills .