Tillering... split vs 3 under

[Red Dwarf]

Could someone please explain to a simple soul how the tillering of a bow should differ if it is to be shot 3 under rather than split-finger?

Many thanks


Red Dwarf

Should? Most of us couldn't tell the difference.  Generally, a bow that has a 1/8th positive tiller is said to be for split finger, and an even tiller for 3-under.  My advice would be to tune the thing and shoot. I've shot 3-under for 40 years and never had an even tillered bow until this year.

[aromakr]

Red:
In simple terms, you want more bend in the upper limb for 3 under than you need for split-finger.

 Its not difficult to understand if you will think about what is happening. You want both limbs to be bent the same at FULL draw. With one finger above the arrow you will be bending the upper limb more than if all three finger were under the arrow, needing less tiller at braceheight. Now for the million dollar question, how much different? That can vary depending on how you grip the bow as that will also effect the bows tiller. If you shoot with a straight wrist ala-Asbell the fulcrum will be closer to the shelf causing a more even tiller then if you heal the bow, which will move the fulcrum down putting more bend in the lower limb which will require more positive tiller in the upper limb. I hope I didn't confuse you more.
Bob

[redant 60/65]

Red if you think about it, most shooters draw with three finger,spilt or three under, but most of the pull is with the middle and ring finger. after 25 years shooting fingers you won't see much change in the bow tiller.That's the way I see it.  

[onemississipp]

The way I see it, when you begin tillering, you decide where arrow pass will be on the bow. Then you decide where on the string you will be pulling from, with the greatest force. You then pull the tillering string from that point as you tiller. So really the difference would be about a fingers width. Three under being closer to the bows true center.

Hope that helps...

[Red Dwarf]

This is where my initial confusion originated: I too read positive tiller for split & even for 3 under, but isn't that just the opposite of what Aromkr is saying?... which seems to make more sense to me. With 3 under you put more pressure on the lower limb therefore requiring more positive tiller not less?

Onemiss..

I like your idea of trying to replicate your own drawing action when tillering. Surely the "centre of resistance" on the handle would be determined by how your grip the bow rather than where the arrow passes?


Red Dwarf

[hera]

The distance between "centre of resistance on the handle"  and "arrow rest "is another important factor.

[onemississipp]

Red Dwarf you are correct, when the bow is on the tillering tree or stick. The handle should be placed as to were the force will be applied when you "Cradle" the bow in your hand. Then the string should be pulled as you will be pulling it, when shooting an arrow. Your string should not be pulled from the center of the handle, since is not the way you are going to be shooting it.

Want to get even more confused!!!

Read this...This is a great read and will shed some light

 http://www.bowyersedge.com/organic.html