Arrow Wind drift explained; heavy vs light, thin vs fat 

I think FOC will affect the drift too

I believe higher FOC will have less wind drift, but at a price of faster (very slightly) reduction of speed

Sounds like a good combination. Higher FOC is great for reducing fletching size, which in turn reduces cross sectional area. I plan on doing a separate video purely talking about fletching size effects on wind drift. Thanks for watching!

Thanks! Glad they have been helpful.

Thanks!

Absolutely in reality the vanes and the broadhead should be a projected areas that changes at a rate relative to the spin rate of the arrow in a cyclic manor relative to a cross wind. Then you have to consider the disruption of flow created by the vents in the broadhead and the spinning of both vanes and broadhead. That's something I want to see if I can test in the wind tunnel but we will see. You might be able to test in a CFD model but in a wind tunnel or shooting with a slow mo camera would be best.

You are welcome be sure to check out part two of wind drift I did make a bad assumption in this video! Take care, Lucas

Another reason why I liked mechanical broadheads for so many years - less cross-sectional area and also less chance to steer the arrow off-line of the fletchings get pushed to the side and cause the arrow to fly slightly sideways.

That is definitely an advantage, what is your favorite broadhead?

My thoughts exactly. I use SEVR broadheads, I think it is close to fieldpoint. Additional, moving the vanes back as much as you can

Thanks Dennis! still working on that wind tunnel.

Great suggestion! I'll try to remember to add a fob into physical testing. Thanks for watching!

I also am planing a separate video for isolating the affects of different fletchings on wind drift. I will include the FOB in that video. Thanks again.

Thanks for watching!

Thank you! Will do!

Glad to hear it! Thanks for watching!

Glad you liked it!

Thanks again!

Appreciate it!!

Thanks!

Thanks! 😊

Thank you, will do.

Can you elaborate more I'm not sure I understand your comment. First part your saying that a cross wind does not hit the side of the arrow? Where does it hit or affect the arrow? Second the arrow aligns to the direction of travel. So that is to say that as wind pushes the arrow left, for example, the tip of the arrow points left since the direction of travel is now changing? I agree the nock always points in the direction of the sum of the air resistance, the resistance from the cross wind and the resistance due to the forward movement of the shaft. So from the previous example a wind from the left would create a vector directed left while the forward motion creates a drag vector opposite the direction of arrow flight, rearward. So the sum of the two would cause the nock to drift left. This drift then increases the amount of drag from forward motion increasing the value of the vector pointed rearward. This video provides a good illustration of how the wind pushes the back of the arrow more than the tip, look at his shaft impact at 100 yards. This is in a wind with a peak of around 15mph measured on sight. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3vyOnGiexUg.html I appreciate your feedback.

@@Lucas_Palmer_bownerd_engineer the wind pushes the whole arrow equally, but the back moves more freely, hence the illusion. If the arrow has a perfect drag coefficient and does not slow down at all, there will be no wind drift. A better description of wind drift is the measure of how much the air slows the projectile down combined with the direction of the force interaction. If the arrow is stationary or held in place, the air hits the side of the arrow. If the arrow is able to pivot and rotate, it aligns to the wind. During launch this aligns the arrow to the point of aim. Therefore the only predictor of wind drift is a combination of drag coefficient at a reference condition and how often the projectile stays in that reference condition.

Hey good question, because we are using the drag equation to determine our force the area is the projected area of the cylinder which would appear as a rectangle. The coefficient of drag is used to account for how easily or difficult it is for the wind to pass over the objects. This is where the curve of the shaft is considered. For a cylinder the Cd is about 1 depending on Reynolds number. A plate or rectangle would be in the neighborhood of 2 or more. I felt that the numbers seemed high as well. But reached a similar conclusion wind is a very bad idea to shoot far in (at animals) especially considering how an archers accuracy is reduced. Another consideration is that as you get closer to the ground the wind is dramatically reduced due to friction with the ground any vegetation or object also reduce and sometimes change direction of the wind or create eddies. I did not consider that as the arrow pitches, back of shaft, due to the wind the cross sectional area will be reduced. I essentially made the assumption that the fletching and drag from forward movement would keep the arrow perpendicular to the wind. All of these will increase the force value and therefore the drift.

@@Lucas_Palmer_bownerd_engineer interesting. I think that might need some more diving into. Good work though!

Great question. The arrow will try to correct in flight. Once the arrow hits the target the tip/broadhead takes over the direction of travel. I touch on this a little more with my video on penetration and FOC more towards the end of each of those videos. Thanks for watching.

Great suggestion! Thanks for watching!

That would be my suggestion you use a vane that corrects your arrow in all situations a proper amount any more and you’re just wasting energy. Group size and accuracy is very important to this as well.

FYI the calculator is now available on iOS working on android version now. Archery ballistics and pro archery ballistics.

Thanks for watching!