tunnel tests

Vern

Vern

Morethan1waytoskinacat
Have recently read that there are multiple people through out the country that have their own or access to tunnels.

I have a question and/or suggestion.
There are varying opinions on the actual/factual effects of wind on the bullet.

Has anyone tried testing by creating artificial wind in the tunnel. Specifically cross wind?
Possibly using a fan(s) (more on the fan issue in a moment) at the muzzle, mid way, and 75-80 area?
What is the actual/factual affect with wind only at one each of these areas and then maybe all combined.

Now for the fan issue. I recently had my fans set up in a 10,000 sqft shop. I was trying to test them and make changes and balance them.

I had some big regular floor fans and when I turned them on and put flags in front of them they acted pretty much like they do at our range. Head on for a while then they would some times whip back and forth and every once in a while go in opposite directions and even 90 degrees to the fans.....

THEN I took a couple of squirrel cage fans that are in air conditioners and put the flags in front of them... they stayed dead on the whole times and the tails stayed consistent the whole time. This leads me to believe that the standard circular fan blades create an air flow that is more like the natural elements.

NOW before you say there was something wrong with the flags when I took them to the match that weekend I watched them in relationship to the other flags on the range and there was no diff in general actions.

What testing has been done or is there anyone interested in testing this?
I am sure we would all like some actual/factual information not just the 100 different opinions that have been argued over and over.
 
but

wouldn't the created drafts bouce of the walls and swirl and........
 
Yes they probably would but depends on the tunnel and other conditions.
It might still give a better clue closer to actual than our guesses

Or better yet put a couple of wind flags at the fan point maybe even some down the tunnel and watch them.
Heck they cant lie anymore in that tunnel than they do out on the field:confused:
 
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there's no magical thing thats gunna do it for ya.Just shoot more.the guy that shot magic at the warehouse was not an out door guy. from what I read??
 
"I had some big regular floor fans and when I turned them on and put flags in front of them they acted pretty much like they do at our range."

How were you able to get your fans to change wind velocity and direction every 10 to 12 seconds?

I know that Genes tunnel isn't wide enough to put a fan in.
 
There are fans in the tunnels, but they move air downrange.

Kinda' hard to get a crosswind going inna' tunnel :p:p

I mean, thinkaliddle!!

Purdy soon you'll be dreaming about mounting a fan on your sailboat..........


LOL


al
 
John Kielly said:
al,

http://www.youtube.com/watch?v=NNbNNSDljGI

John
Click to expand...

DUDE! It's deja vu all over again!

I remember this stuff from the 70's (Popular Science, Popular Mechanics, Scientific American)

There was a wind turbine design (back when turbine meant TURBINE not windmill blades) that kinda looked like a soup can box kite that freakin' SWALLOWED a bone man...

(now lest ye non-reading bourgeouisie (that's bushwahh for you hippies) think ill of my description..... "with the bone in her teeth" goes back hunnerts and hunnerts of years)

Kielly, being of more genteel descent, knows well of which I speak ;)

al
 
Mckinnie, I am not looking for anything magical. Simply looking for information to gain a greater understanding. It has nothing to do with warehouses but knowledge.
Just like anything else facts change things.

Ted that was what amazed me the flags reacted the same as everyone elses on the range yet with what seemed to be a consistent wind they acted erratic just like they did on the range. It has something to do with the way the fan creates the wind just as I pointed out the squirrel cage made every thing stable.

No Al the reason I posted was I dont have the information on size of everyones tunnels out there or what they may have tried.
AS was noted in a recent thread what was thought about ballistics and wind for decades and was even proven so to say in theory with mathematics turned out to be wrong and was dis proven.

Theories are just that theories until they have actual hard fact to back them up. Ask scientists about black holes there are a fair range of different theories/opinions about them.
Theories are like opinions and opinions are like the bodily orifice on the back side of your body. Everyone has one and some people are one.

All I am looking for is to see if anyone has actually tried any physical experiments.

For a long time I didnt grasp the observation of watch the whole field of flags because I could see flags 2 rows over doing something different than mine and in watching mine they never did do what was happening 2 rows over.
One day in watching my flags on an 11-1 clock fairly stiff wind, the far flags changed I expected the next in the row to change but it took 5-10 secs and then so one. I learned something many already knew wind even blowing hard does not necessarily cover the same distance as is perceived.
 
John,
Thats very ingenious. At first glance it looks like nothing more than a regular dry land windmill principal only instead of operating a pump it turns a prop.
Still ingenious.
 
Vern,
The air from an axial (floor) fan comes out with large helical swirls in it, which can make your flags unsteady. Centrifugal (squirrel cage) fans have straighter flow. Wind tunnels, like for testing car and plane models, use flow straighteners if the fan is at the inlet of the tunnel, but more often have the fan at the outlet of the tunnel so that the flow is sucked in straight through the test section. If you get serious about testing flags, you could build your own wind tunnel: http://www.sciencebuddies.org/science-fair-projects/wind-tunnel-toc.shtml
 
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