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Mar 25th, 2012
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Trig Question #7285916 09/13/18 08:00 PM
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BB675 Offline OP
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We recently just bought some property and I put up a ladder stand and a feeder to hunt deer this season. This may sound as simple as Pythagorean theorem but I don't think it is because of slope and gravity. Unfortunately my range finder does not calculate slope or I believe this would be easy.

The elevation change between my feeder and stand is roughly 12' (stand is higher)

The shooting rail from the ground is 18'

The distance from when I use my range finder from sitting in my stand to my feeder is 35 yards.

What is the true distance? I believe I will shoot a little high because gravity is working less on the arrow than if I was shooting on a flat surface. I plan on going next weekend to shoot and find out but it has had me curious.

Re: Trig Question [Re: BB675] #7285924 09/13/18 08:06 PM
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Texasteach Offline
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Article on your exact topic True Distance Archery Shots

Basically, at the height of your stand and within 40 yards, no discernible difference.

Last edited by Texasteach; 09/13/18 08:09 PM.

You did what?
Re: Trig Question [Re: Texasteach] #7285934 09/13/18 08:15 PM
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Originally Posted By: Texasteach
Article on your exact topic True Distance Archery Shots

Basically, at the height of your stand and within 40 yards, no discernible difference.


Agreed, next to no change.



Re: Trig Question [Re: BB675] #7285936 09/13/18 08:17 PM
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Texasteach Offline
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P.S. It is a Pythagorean problem, because slope is accounted for, and gravity over the true range is a constant. (ie. If true distance is known, then you are shooting with a sight pin that is already compensated for the gravity at that known distance. Hope that make sense.)


You did what?
Re: Trig Question [Re: BB675] #7285940 09/13/18 08:22 PM
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bronco71 Offline
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almost no change but due to gravity you have to hold a bit lower than if it was a level shot, same for shooting uphill....not sure how much with your numbers but a 60 yard shot from an elevated blind at about a 20 degree angle you would aim as if it was a 56 yard level shot, which could amount to a miss or poor hit with a bow.

Re: Trig Question [Re: BB675] #7285951 09/13/18 08:37 PM
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Pythagorean only if a right angle is involved. Shooting at both down or up angles will cause shots to go high. Download the Shooter app (made for rifles but takes angles into consideration) and see if you can apply your archery numbers.

The more I think about it (I donít bow hunt) thereís bound to be an archery app out there to cover this.

Last edited by P_102; 09/13/18 08:39 PM.

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Re: Trig Question [Re: BB675] #7285985 09/13/18 09:24 PM
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At 35 yards you may want to aim a foot under the deer. Good chance they will duck an arrow at that distance. Try pouring out some corn at 20-25 yards in front of your stand so you don't have to learn the hard way.

Re: Trig Question [Re: BB675] #7286001 09/13/18 09:38 PM
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Originally Posted By: BB675
We recently just bought some property and I put up a ladder stand and a feeder to hunt deer this season. This may sound as simple as Pythagorean theorem but I don't think it is because of slope and gravity. Unfortunately my range finder does not calculate slope or I believe this would be easy.

The elevation change between my feeder and stand is roughly 12' (stand is higher)

The shooting rail from the ground is 18'

The distance from when I use my range finder from sitting in my stand to my feeder is 35 yards.

What is the true distance? I believe I will shoot a little high because gravity is working less on the arrow than if I was shooting on a flat surface. I plan on going next weekend to shoot and find out but it has had me curious.


Set up a target at your feeder, and, using the same weight/head configuration that you will be using during the season, and make a few shots from your ladder stand with your pin on the bulls eye. Shoot a group of 3 and get an "over/under" average for your group.

Last edited by mikei; 09/13/18 09:41 PM.
Re: Trig Question [Re: BB675] #7286040 09/13/18 10:48 PM
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What if the Native American's had had Trig, compound and xbows!

Re: Trig Question [Re: Always ready 2 hunt] #7286075 09/13/18 11:41 PM
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Originally Posted By: Always ready 2 hunt
What if the Native American's had had Trig, compound and xbows!


They got rifles instead. I'm with them.


...and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. Gen. 1:28
Re: Trig Question [Re: mikei] #7286249 09/14/18 02:56 AM
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Originally Posted By: mikei
Originally Posted By: BB675
We recently just bought some property and I put up a ladder stand and a feeder to hunt deer this season. This may sound as simple as Pythagorean theorem but I don't think it is because of slope and gravity. Unfortunately my range finder does not calculate slope or I believe this would be easy.

The elevation change between my feeder and stand is roughly 12' (stand is higher)

The shooting rail from the ground is 18'

The distance from when I use my range finder from sitting in my stand to my feeder is 35 yards.

What is the true distance? I believe I will shoot a little high because gravity is working less on the arrow than if I was shooting on a flat surface. I plan on going next weekend to shoot and find out but it has had me curious.


Set up a target at your feeder, and, using the same weight/head configuration that you will be using during the season, and make a few shots from your ladder stand with your pin on the bulls eye. Shoot a group of 3 and get an "over/under" average for your group.

Re: Trig Question [Re: BB675] #7286279 09/14/18 03:18 AM
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Are you shooting with or against the rotation of the earth?

And remember, if ALL of the Chinese in China jump up and down simultaneously, the resulting "bounce" of the earth will cause a sinusoidal wave effect which can cause your shot to either go low or high.


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Re: Trig Question [Re: BB675] #7286665 09/14/18 04:29 PM
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True horizontal distance from your shooting rail to your feeder is 33.54 yards as best I can figure it.

If you add the 12 feet of elevation difference plus the 18 feet above ground level, your shooting rail is 30 feet, or 10 yards above your feeder.

You are solving for the horizontal leg of a right triangle, where the hypotenuse is the 35 yards from the rail to the feeder, and vertical leg is the 10 yards that the rail is above the feeder.

so 35^2=10^2 +X^2

Solve for X and I am coming up with 33.54 yards.

A very negligible difference as several folks noted! smile

Re: Trig Question [Re: BB675] #7286765 09/14/18 05:54 PM
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Don't forget to compensate for the curvature of the Earth.


If you want some friendly advice, get a haircut and take a bath. You wouldn't get hassled so much.


Re: Trig Question [Re: BB675] #7291989 09/20/18 03:18 AM
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Shoot 1.376955" low and you are good to go!


Old age and treachery beats youth and stupid every time!
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