INFO: Trad Archery for Bowhunters



Author Topic: Wind deflection on arrows  (Read 2235 times)

Offline FLHunter

  • Trad Bowhunter
  • **
  • Posts: 52
Re: Wind deflection on arrows
« Reply #40 on: January 30, 2006, 02:53:00 PM »
I didn't get that kinda drift out of a 4 mph direct X-wind about 5.87 ft/sec.  A 15 mph X-wind is 22ft per/sec drift.

JC-  Think of it this way.  If two airplanes of different sizes were traveling south to north on a heading of north and it had a 15 mph direct crosswind from the east. The each aircraft without crabbing into the wind for course correction would be 15 miles west of course in a hours time.  If one were slower than the other it would be further off course over a given distance than the other, but both would be 15 miles off course at the end of an hour.

Were talking about an arrow moving freely within the air mass, but without any outside correction.  The difference between the surface areas on an arrow is there, and drag is certainly a coefficient variable, but with the short air time that an arrow has its really not significant. Except for extended flight periods which is not the case.
Aim Hard!

Offline henpeckedmuch

  • Trad Bowhunter
  • **
  • Posts: 21
Re: Wind deflection on arrows
« Reply #41 on: January 30, 2006, 03:07:00 PM »
FL Hunter, I'm so glad someone else tried to explaned this to everyone.I've heard this junk for years. I just tell them to take a rifle with a  high powered scope and stand in 10-15mp wind blowing crosswise and try to aim at a target at 100yd.They will soon see the reason it is hard to shoot in the wind. It isn't how far the wind blows the bullet around.It's how far the wind blows you around. The wind does move the arrow some but come-on traditional equiptment at 15-25yd. not very much.

Offline JC

  • Moderator
  • Trad Bowhunter
  • ***
  • Posts: 4466
Re: Wind deflection on arrows
« Reply #42 on: January 30, 2006, 03:13:00 PM »
Ahh....so it's there, just because the flight time it's insignificant. That makes more sense. I would think the difference would be at least a few inches at 15-20mph....that would be significant to me...but I'd have to do the calc to be sure it would be that much. You think it's less than a few inches?

It doesn't make sense that both planes would be exactly 15 miles off course...the lateral surface area would effect the amount of force the crosswind applied to each plane...wouldn't it?
"Being there was good enough..." Charlie Lamb reflecting on a hunt
TGMM Brotherhood of the Bow

Offline FLHunter

  • Trad Bowhunter
  • **
  • Posts: 52
Re: Wind deflection on arrows
« Reply #43 on: January 30, 2006, 03:41:00 PM »
JC,

Fifteen miles is fifteen miles the aircraft cross section has nothing to do with it.

If I were in a row boat in a river no wind conditions, no power, with a 15mph current how far down river would I be in an hour?

If I were in a riverboat in a river in no wind conditions, no power, with a 15mph current how far down river would I be in an hour?

The principle is the same with an airplane.  It can also be described in terms of tailwind or headwind.  

If we are going 200mph and we have a 50mph tailwind whats our ground speed and how far would we travel in an hour?  Remember we are in an airmass when you answer!  

Now change that to a headwind we have an airspeed of 300mph with a 100mph headwind whats our groundspeed?  We would travel how far in an hour?  

Samething as the example of a 15mph direct crosswind. Your going to be off course 15 miles if not corrected.

JC, my calculations are that with a trad bow shooting at the 180fps in a 15mph X-wind shooting at a 20yd target the drift would be about 7.33inches in the .333 seconds it takes to get to target.  With the 4mph crosswind the drift would be about 2" at the same distance same bow setup.
Aim Hard!

Offline O.L. Adcock

  • Trad Bowhunter
  • **
  • Posts: 824
Re: Wind deflection on arrows
« Reply #44 on: January 30, 2006, 07:40:00 PM »
Lets do it this way JC, once the arrow stabilizes, the arrow doesn't know the wind is blowing no matter how hard or from what direction, it stabilizes into the "relative" wind and to it, nothing has changed as far as the arrow is concerned. It has to us cause our feet are on the ground stationary. If we were drifting as the arrow is, we wouldn't see any kicks or bobbles cause we'd always be behind the arrow just as if there was zero wind. It is significant if for no other reason it causes the arrow to hit at an angle which is bad news for penertation....O.L.
---Six NAA/FITA National and World flight records.----

Offline Aaron Proffitt

  • Trad Bowhunter
  • **
  • Posts: 76
Re: Wind deflection on arrows
« Reply #45 on: January 30, 2006, 07:53:00 PM »
But,just so I am absolutly clear ...
If your shooting in an area where the wind on the arrow isn't constant(gusty,objects,buildings)the arrow will fly eratically due the fact that the force against isn't constant.Ergo, it never has a chance to correct ?
  JUST MAKING SURE !!   :)
"First thing we do,let's kill all the lawyers".
Shakespeare Henry VI, Part 2

Does an agnostic,dyslexic,insomniac lie awake at night wondering if there really is a Dog ?

Offline FLHunter

  • Trad Bowhunter
  • **
  • Posts: 52
Re: Wind deflection on arrows
« Reply #46 on: January 30, 2006, 08:07:00 PM »
NO Aaron,

The arrow is going to follow the wind currents.!!!  If the wind currents are erratic because of disturbed flow around objects, thats what the arrow is going to follow!  

It has nothing with the arrow stabilizing where it comes out of archers paradox. One has nothing to do with the other if thats what you mean.

Recovery rate out of archers paradox related to the correct spine selection for the type of arrow your shooting be it carbons, aluminums, or woodies for the bow at a particular drawweight and drawlength.  Also effected by the quality of your release and the tune of your bow. NOT the wind!

Good Luck in your shooting! I've gone as far as I'm willing to go on this thread.  I have arrows to build arrows and need to practice for a tournament.  Shoot Straight!
Aim Hard!

Offline Aaron Proffitt

  • Trad Bowhunter
  • **
  • Posts: 76
Re: Wind deflection on arrows
« Reply #47 on: January 30, 2006, 08:27:00 PM »
Ok maybe "correct" wasn't the right word.  :bigsmyl:    :bigsmyl:
"First thing we do,let's kill all the lawyers".
Shakespeare Henry VI, Part 2

Does an agnostic,dyslexic,insomniac lie awake at night wondering if there really is a Dog ?

Users currently browsing this topic:

0 Members and 1 Guest are viewing this topic.
 

Contact Us | Trad Gang.com © | User Agreement

Copyright 2003 thru 2019 ~ Trad Gang.com ©