Primitive Archer

Main Discussion Area => Bows => Topic started by: ricktrojanowski on November 18, 2008, 07:11:20 am

Title: Propeller twist
Post by: ricktrojanowski on November 18, 2008, 07:11:20 am

On a bow that I'm working on (Hazel) one of the limbs has some propeller twist.  Should I try to remove this with heat or tiller the bow with the twist in mind?   

Title: Re: Propeller twist
Post by: GregB on November 18, 2008, 08:24:55 am

Should be able to at least help remove the propellor depending on how bad it is using dry heat.

Title: Re: Propeller twist
Post by: a finnish native on November 18, 2008, 08:29:59 am

how bad is it? depending on that you might want to leave it alone or straighten it up. A picture tells more than a thousand words.

Title: Re: Propeller twist
Post by: broad_head on November 18, 2008, 10:00:58 am

I never try to remove it, just makes tillering interesting?
                                                                              Peter (UK)

Title: Re: Propeller twist
Post by: TRACY on November 18, 2008, 10:06:50 am

Remove what you can if it's bad, otherwise tiller it and shoot it.

Tracy

Title: Re: Propeller twist
Post by: George Tsoukalas on November 18, 2008, 10:16:31 am

I would just tiller it. Is it as bad as Aerobow. Jawge
http://georgeandjoni.home.comcast.net/~georgeandjoni/aerobow.html

Title: Re: Propeller twist
Post by: Keenan on November 18, 2008, 11:47:34 am

Often prop limbs will counter act and line up when strung. Just make sure your string groves are good and go for it. If the string bisects the handle you should be fine.

Title: Re: Propeller twist
Post by: JackCrafty on November 18, 2008, 11:52:42 am

I don't mess with prop twist too much anymore.  There's too much risk for longitudinal cracks. The last one I tried was a live oak stave.....cracked badly right up the middle of one of the limbs. :-\

Title: Re: Propeller twist
Post by: Pat B on November 18, 2008, 01:38:19 pm

You can also tiller out a twist by removing wood from the high side.   Rick, is the twist there at full draw?      Pat

Title: Re: Propeller twist
Post by: ricktrojanowski on November 18, 2008, 09:01:56 pm

Thanks for the advice guys.
George- Not quite the aero bow.  But that is sweet it must have been quite a challenge.

Pat- I'm only at the floor tiller stage.  So I haven't strung it yet.  It is the bow from the stone age build a long that I'm slowly working on.  I did some dry heat straightening on it over a fire.  Since I removed some wood and am getting it bending it is going back to it's original crooked stage.  Not as bad,  but definitely creeping back.  So I figured since I would have to straighten more I might try to get some of the twist out.  But I think I will probably tiller it twisted and remove the wood from the high side as you suggested  since it isn't too bad.

Title: Re: Propeller twist
Post by: George Tsoukalas on November 18, 2008, 09:35:42 pm

Then I would leave it. Remove wood evenly from the limb. If the twist is a natural one just tiller it out but remember to flip the bow and evaluate tiller form both sides. It will appear differently but in your mind strike a mid ground. Jawge

Title: Re: Propeller twist
Post by: shamus on November 19, 2008, 08:13:11 am

I'd leave it.

What's more important is if the string  is inline (bisects) the handle.