Primitive Archer

Main Discussion Area => Bows => Topic started by: justsomedude on January 29, 2017, 06:06:37 pm

Title: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 06:06:37 pm
Red Oak Board bow 69" ntn. Currently at 44#@26.5" (I draw about 28").

Looking at the tiller, the bow responds differently depending on which end is up...I am holding the arrow on my hand 1.25" above center (I intend to cut a shelf but haven't yet).

I know I still have evening out to do and I will be sanding as well and don't want to reduce the weight a whole lot.
What do you see about the potential of Side A or B being on top?

It shoots pretty well (short drawing)

A has more bend (that bend is in the set unstrung too) and has slight hinge...B will need to be reduced more.
This is "A Top"
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 06:08:20 pm
"B Top"
And I am short drawing....
Title: Re: 3 Under Tiller question
Post by: mwosborn on January 29, 2017, 08:15:51 pm
Looks like the inner third on both limbs need to work a little bit.  Limb A appears to be weaker and really bending in the outer 1/2.  Got an unstrung pic?
Title: Re: 3 Under Tiller question
Post by: upstatenybowyer on January 29, 2017, 08:21:31 pm
Those inners could definitely bend more. When I start to tiller a static handle bow I usually try to get the inner limbs bending a little first and go out from there.
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 08:46:25 pm
Limb "A" on left. It feels like a good thing to have positive tiller.

Title: Re: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 09:03:32 pm
That bump that set in is from loading it too fast too soon....I can't see subtleties yet. Learning!
Title: Re: 3 Under Tiller question
Post by: PatM on January 29, 2017, 09:11:34 pm
The first pic looks better but still needs a lot of work.
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 09:28:57 pm
I just found this pic of me shooting a Hill bow 3 under...will use as a reference
Title: Re: 3 Under Tiller question
Post by: mwosborn on January 29, 2017, 11:08:58 pm
I would use limb "a" as the upper limb and get the inner 1/3 of each limb working.  Do you have a tillering gizmo?  That might help you get them bending  a bit more even.  Are you string walking shooting the Hill?
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 29, 2017, 11:38:48 pm
Agreed. I cut in a narrow shelf just now. I don't have a tiller stick yet so I have to use a camera for now.

And yes, that Hill bow was very tolerant to 3 under and light string walking while still staying quiet.
Would be nice to copy that if I can figure it out.
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 30, 2017, 10:02:22 am
Getting closer. I just rasped around the fades and took down some humps mid limbs and near the tips. I have started to radius the grip and shelf. Good news is that it shoots straight. I just used it for my 'first shot of the day' on leatherwall. Guessed my gap and was just a few inches high.
Quote
Title: Re: 3 Under Tiller question
Post by: Pappy on January 30, 2017, 10:05:44 am
3 under puts more stress on the bottom limb, so If I know someone is going to shoot 3 under I make the bottom a bit stiffer that I normally would. :)
 Pappy
Title: Re: 3 Under Tiller question
Post by: PatM on January 30, 2017, 10:25:57 am
Your bottom lib is already weaker and it will become more so over time, especially if you shoot three under and string walk as well.
Title: Re: 3 Under Tiller question
Post by: justsomedude on January 30, 2017, 11:05:22 am
I will NOT String walk...will leave that for my ILF
Title: Re: 3 Under Tiller question
Post by: Newindian on January 30, 2017, 12:04:20 pm
Not so easy to see in that picture, but it looks like your lower is bending more than the upper, and the upper is a smidge stiff in the outer third, if you get that bit working It would probably come out just right
Title: Re: 3 Under Tiller question
Post by: bow101 on January 30, 2017, 12:04:42 pm
Looks like the inner third on both limbs need to work a little bit.  Limb A appears to be weaker and really bending in the outer 1/2.  Got an unstrung pic?

+2 on that one, also what Pappy mentioned  "If I know someone is going to shoot 3 under I make the bottom a bit stiffer that I normally would. :) "
 Pappy
Title: Re: 3 Under Tiller question
Post by: justsomedude on February 02, 2017, 02:03:17 pm
I refined it with sanding and I'm calling this one 'good' before I ruin it. There is a hump in the top limb but it is set that way and I'm right at my target of 45#@28" right now.
Just need to thin the grip out some more. I'm gripping low in the photo which is loading the bottom limb more in addition to 3 under

Thanks for the help. Planning build #2 now