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Main Boards => The Bowyer's Bench => Topic started by: peter61 on October 09, 2017, 06:13:00 AM

Title: Radius for Semi-Recurve
Post by: peter61 on October 09, 2017, 06:13:00 AM

Hi Tradgangers!
I want to build a straight limbed semi-recurve bow. Question is, which radius should I draw for the form?

Greetings, Peter

Title: Re: Radius for Semi-Recurve
Post by: on October 09, 2017, 12:18:00 PM

I found that on my Glass, R-D bows they start to hold a recurve at about the 28"  radius mark... There are a lot of variables though such as taper and such...  Plus You are building a straight limb so things will be a little different...  Hope this helps...

Title: Re: Radius for Semi-Recurve
Post by: peter61 on October 09, 2017, 01:46:00 PM

Thanx Shredd for the input.
The background for my question is, I would like to build a 50's recurve, which are more or less straight limbed, semi-recurves. So my idea is, no or less reflex and slight curves.
So, I'm open for all ideas!

Title: Re: Radius for Semi-Recurve
Post by: Sant-Ravenhill on October 24, 2017, 03:25:00 PM

Not the original poster, but I would love to hear from others. Thanks.

Title: Re: Radius for Semi-Recurve
Post by: KenH on October 24, 2017, 04:17:00 PM

I'd start drawing some straight lines that curve at the end and see what looks good to your eye.  My personal estimate would be a 6" radius.

Title: Re: Radius for Semi-Recurve
Post by: Mad Max on October 24, 2017, 05:19:00 PM

Quote

Originally posted by KenH:
I'd start drawing some straight lines that curve at the end and see what looks good to your eye.  My personal estimate would be a 6" radius.

me 2

Title: Re: Radius for Semi-Recurve
Post by: Bowjunkie on October 24, 2017, 06:29:00 PM

6" radius? 12" diameter? No. Too small, IMO. But many work... many are good.

Besides that... I don't like to see it referenced as a simple radius because I think most work better as accelerated curves, as it nears the tips.

Title: Re: Radius for Semi-Recurve
Post by: Mad Max on October 24, 2017, 06:44:00 PM

KISS factor on this one

Title: Re: Radius for Semi-Recurve
Post by: KenH on October 24, 2017, 10:12:00 PM

Ever see the recurved tips of a Scythian bow?  48" bow with recurves less than 4" in radius.  You're right, the recurves are usually not just tangential to the line of the limb, but I have seen some that way, and it's a good place to start -- 6" radius but only 1/4 of a circle...

Title: Re: Radius for Semi-Recurve
Post by: Mad Max on October 24, 2017, 10:33:00 PM

I see what you are talking about.
pretty cool ken

Title: Re: Radius for Semi-Recurve
Post by: peter61 on October 25, 2017, 12:34:00 AM

Thanks for the input, guys!
You are very helpful.
Four inch radius and a quarter of a circle sounds good to me.

Gretings, Peter

Title: Re: Radius for Semi-Recurve
Post by: LittleBen on October 25, 2017, 11:00:00 PM

Draw out the profile of the bow when it is strung as you want it, then measure the radius of curvature, then make it slightly smaller for the form since they will bend some when you string it.

K.I.S.S. .... keep it simple stupid.

Title: Re: Radius for Semi-Recurve
Post by: Loft on October 28, 2017, 06:01:00 AM

Hi All
New here. Been lurking for a while, and could remember this thread:
 http://tradgang.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=125;t=014115#000001

Just searched for “vintage”

Loft

Title: Re: Radius for Semi-Recurve
Post by: KenH on October 28, 2017, 11:29:00 AM

I was trying to remember the name of that article!  Thanks for posting it!!