Post by: Florida_Native on July 11, 2015, 06:41:23 PM
When shooting at an angle your shot should be made at the horizontal distance or b in terms of the theorem. However, a range finder without the tilt/arc function would give you c.
Let say I am shooting at a distance of 50 yards my max with a bow and an elevation of 10 yards. My nontilt range finder will tell me to shoot at approx. 51 yards when I should be shooting at 50. Correct? So this is a difference of 1 yard or 3 feet.
Lets change the elevation to 50 yards just for giggles. the range finder will say to shoot at 70 yards and I should only shoot at 50.
So in scenario 1 the need for the tilt function is negligible an in scenario 2 necessary.
If I am correct in my math the decision to spend the extra money on the tilt function comes down to the probability I will shoot at above 10 yards. Any thoughts on this probability?
Post by: Bob33 on July 11, 2015, 06:59:22 PM
Post by: Magnum_Willys on July 11, 2015, 07:07:47 PM
Post by: Magnum_Willys on July 11, 2015, 07:46:39 PM
If I am correct in my math the decision to spend the extra money on the tilt function comes down to the probability I will shoot at above 10 yards. Any thoughts on this probability?
You mean "degrees" I think. 20 degrees is REALLY steep in the field. You wouldn't think so but it is, unless maybe you are a sheep hunter. Now if you are a bow hunter with a TALL tree stand maybe it makes a big difference.
Post by: Florida_Native on July 11, 2015, 07:51:39 PM
Based on my calculations it seems as though the function would rarely come in handy but I haven't hunted that many areas. Do you ever find that the tilt would be necessary? I don't want to get the cheaper one for now and end up needing the tilt later.
Post by: Florida_Native on July 11, 2015, 07:53:41 PM
You mean "degrees" I think. 20 degrees is REALLY steep in the field. You wouldn't think so but it is, unless maybe you are a sheep hunter. Now if you are a bow hunter with a TALL tree stand maybe it makes a big difference.
No the formula I am using is based on height. The formula fro degrees was much longer and frankly hurt my head thinking about.
Post by: Bob33 on July 11, 2015, 08:02:12 PM
I would imagine no range finder uses the Pythagorean theorem since it would have to know the elevation.The Pythagorean theorem needs the actual distance, and angle. Elevation is irrelevant.
Post by: Florida_Native on July 11, 2015, 08:18:28 PM
I'm not using the right formula with angles. I believe its the riflemans formula or something. I was trying to oversimplify it.
Post by: Magnum_Willys on July 11, 2015, 08:28:38 PM
Range finder says 20 yards its really 17.3
says 40 its really 38.7
says 60 really 59.2
square root of (range finder squared minus stand height squared) = true ballistic range
Post by: Florida_Native on July 11, 2015, 08:45:05 PM
Assume you were 10 yards up in the tree....
Range finder says 20 yards its really 17.3
says 40 its really 38.7
says 60 really 59.2
square root of (range finder squared minus stand height squared) = true ballistic range
Ok, I'm on the same page:) So at a longer distance the angle is less so it becomes closer to true distance per the rangefinder.
Next question. Would you shoot different at a 17 yard target than a 20? I'm not experienced enough with a bow to confidently answer?
Thanks for chatting this through with me BTW!
Post by: JimmyHoffa on July 11, 2015, 08:48:51 PM
Post by: Magnum_Willys on July 11, 2015, 09:07:52 PM
Next question. Would you shoot different at a 17 yard target than a 20? I'm not experienced enough with a bow to confidently answer?
Ballpark about an inch difference , 4 inches if off by 10 yards
Post by: RadSav on July 12, 2015, 01:39:47 AM
Next question. Would you shoot different at a 17 yard target than a 20? I'm not experienced enough with a bow to confidently answer?
Depends on what target you are trying to shoot. Are you wanting to shoot the head off a grouse or hit the lungs of an elk?
On my favorite bow my over/under on the X-Ring of a 20 yard NFAA field target is 20.7/19.1 Five ring on the same target is 21.4/18.3 and the 4 ring is 23.8/12.5 Extend the range and slow down the bow and the over/under gap gets larger to a fair degree.
IMO - The first time you miss a big buck at 50 yards downhill you will wish you spent the extra $70 ;)
Post by: raydog on July 12, 2015, 03:08:00 PM
Next question. Would you shoot different at a 17 yard target than a 20? I'm not experienced enough with a bow to confidently answer?
IMO - The first time you miss a big buck at 50 yards downhill you will wish you spent the extra $70 ;)
:yeah:
Post by: flcracker on July 13, 2015, 10:01:56 AM
Post by: luvmystang67 on July 13, 2015, 10:34:50 AM
Someone on here has previously mentioned it, but if you take the cosign of the angle (angle above or below level) and multiply that by the range shown on the rangefinder, that'll give you the true level distance.
If you're looking down at 15 degrees and your old school rangefinder shows 200 yards, to figure out true distance:
1) Make sure you calculator is in degree mode (many default to radians, which for those of you who may not know, is just a different way to measure angle, instead of 360 degrees in a circle, there are 2xpi = ~6.28 radians in a circle). If your calculator is in the wrong mode, when you type in 15, it may think you're talking 15 radians and not 15 degrees.
2) The equation is quite simple, plug in cos(15 degrees) * 200 yards = 0.9659 * 200 = 193 yards true aim.