10mph wind deflection calculated incorrectly

olinaz · Rookie Member Joined: May 23, 2015 Posts: 2

When I compute the ballistics for loads the wind deflection (10mph) is calculated incorrectly. For example, for one load the wind def for 25 yards is -454.58, 100 yards is -438.90, 1000 yards is -250.80, and 1500 yards is -146.30. I have updated for the latest changes. It was working fine and then just started doing this. Any ideas?

DallanC · Site Admin Joined: Jan 18, 2005 Posts: 3571 Location: Utah

What variables are you using in your computation? What are the max range and range increment settings?

-DallanC

olinaz · Rookie Member Joined: May 23, 2015 Posts: 2

I am using 25 yard increments and 1500 yard max.

BowPhoto99 · Rookie Member Joined: Nov 19, 2010 Posts: 2

If it helps, I too am having the same wind deflection calculations: using a .264 Hornady AMAX, 500 yd range, 50 yd increments, MV velocity of 2650 fps, and at 50 yrds says -438.64 inches and at 500 yards is -346.83 inches for 10 mph crosswind.

This was working last fall so must be in a recent update since then?

Everything else is stellar though, working well.

MFP

BowPhoto99 · Rookie Member Joined: Nov 19, 2010 Posts: 2

Finally got to posting the table of data.

For my .264 shooting at MV 2660 fps, sight height 1.5, and out to 500 yards, I got deflections of : 100 yd = -485.81, 200 yd = -452.68, 300 yd = -439.54, 400 yd = -416.41 and 500 yd = -393.28.

Not only is the wind deflection getting smaller the farther out, but I'd be missing the target by a whole bunch!

Can anyone else replicate this?

DallanC · Site Admin Joined: Jan 18, 2005 Posts: 3571 Location: Utah

I finally found time to mess with this, I've found the problem and have a potential fix. I hope to push a new version up tomorrow with a few more fixes.

-DallanC

Elvis

YOU DA MAN
thank you for all the time and effort you put in DallanC

PaulS

Good job Dallan! I hope you get some contributors out of this. It's a great piece of software - it's just too bad it isn't portable to Linux. Wink