Why are modern recurve limbs generally flat and wide? - TradTalk Forums
TradTalk Forums

Site Sponsors
Log in
User Name:

Password:

Not a member yet?
Register Now!
Patron Membership
Board Menu
» Help

Go Back   TradTalk Forums > Main Category > TradTalk Main Forum

Reply
 
Thread Tools Display Modes
  #1  
Old 02-17-2017, 07:40 AM
Bamerabi Bamerabi is offline
 
Join Date: Jul 2016
Location: US Pennsylvania
Posts: 385
Thanks: 39
Thanked 102 Times in 77 Posts
Bamerabi is on a distinguished road
Default Why are modern recurve limbs generally flat and wide?

Longbow limbs come in flat and not so flat shapes. Asian limbs arent so flat either.

What is the reason that recurves - oly types in particular usually have flat limbs?
Reply With Quote
Remove Ads
  #2  
Old 02-17-2017, 09:12 AM
Grizzly's Avatar
Grizzly Grizzly is offline
 
Join Date: Mar 2005
Location: Central Illinois
Posts: 1,657
Thanks: 313
Thanked 543 Times in 408 Posts
Grizzly is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Interesting question. The smoothest pulling recurve I have is an old Browning Safari I (Deluxe Composite) 54" 40#. The limbs are wider than the Bears, Roots or Wings by 1/4" and the laminations are nearly half as thick.

I would think the oly type recurves are going after some sort of smoothness and feel as their priority.
__________________
Craig
Grizzly could be changed to Calledoutofthewoods, since being called to Church.

If you can't remember where you left your shoes and socks, a shooting system may not work......
Reply With Quote
  #3  
Old 02-17-2017, 10:27 AM
Sauk Mtn Sauk Mtn is offline
 
Join Date: Aug 2015
Location: WA
Posts: 84
Thanks: 94
Thanked 53 Times in 22 Posts
Sauk Mtn is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

A skinny recurve limb would be pretty unstable side to side.
Reply With Quote
 
  #4  
Old 02-17-2017, 12:29 PM
Mr. Roboto Mr. Roboto is offline
 
Join Date: Nov 2014
Location: Washington State
Posts: 905
Thanks: 490
Thanked 344 Times in 182 Posts
Mr. Roboto is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

What does "unstable" mean? Does this mean that the limbs change from shot to shot?

Or does this mean that it just reveals the shooters form inconsistencies? So we blame the limbs instead of ourselves?
Reply With Quote
  #5  
Old 02-17-2017, 12:37 PM
Tooner's Avatar
Tooner Tooner is online now
 
Join Date: Oct 2012
Location: TN
Posts: 198
Thanks: 75
Thanked 99 Times in 54 Posts
Tooner is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Torsional stability. "Unstable" as in you couldn't keep it strung.
Reply With Quote
  #6  
Old 02-17-2017, 01:32 PM
Bamerabi Bamerabi is offline
 
Join Date: Jul 2016
Location: US Pennsylvania
Posts: 385
Thanks: 39
Thanked 102 Times in 77 Posts
Bamerabi is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Quote:
Originally Posted by Mr. Roboto View Post
What does "unstable" mean? Does this mean that the limbs change from shot to shot?

Or does this mean that it just reveals the shooters form inconsistencies? So we blame the limbs instead of ourselves?
Unstable with respect to machines generality means that small variances in input can have large variances in output.

Think of airplanes.
Reply With Quote
  #7  
Old 02-17-2017, 01:35 PM
Bamerabi Bamerabi is offline
 
Join Date: Jul 2016
Location: US Pennsylvania
Posts: 385
Thanks: 39
Thanked 102 Times in 77 Posts
Bamerabi is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Quote:
Originally Posted by Tooner View Post
Torsional stability. "Unstable" as in you couldn't keep it strung.
In general a wide flat structure has less torsional stability than a square or round structure.

But the wide flat flat structure would offer more lateral stability.
Reply With Quote
  #8  
Old 02-17-2017, 02:39 PM
Hank D Thoreau's Avatar
Hank D Thoreau Hank D Thoreau is offline
Civil but Disobedient
 
Join Date: Feb 2009
Location: Southern California
Posts: 7,409
Thanks: 276
Thanked 2,776 Times in 1,826 Posts
Hank D Thoreau is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

I don't recall the formula but I think that width and thickness contribute to weight by differing powers. As such, there may also a limb weight aspect to the answer.
__________________
USA Archery, NFAA
El Dorado Archers, Oranco Bowmen, Mojave Archers
Reply With Quote
  #9  
Old 02-17-2017, 02:58 PM
Tooner's Avatar
Tooner Tooner is online now
 
Join Date: Oct 2012
Location: TN
Posts: 198
Thanks: 75
Thanked 99 Times in 54 Posts
Tooner is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Quote:
Originally Posted by Bamerabi View Post
In general a wide flat structure has less torsional stability than a square or round structure.

But the wide flat flat structure would offer more lateral stability.
I probably should have said lateral stability and not torsional stability. A "square" or "round" structure is by definition equally as thick as it is wide. A recurve limb isn't. A longbow limb can get away with being narrower (side to side) because there isn't a hook in the end and therefore has much less chance of lateral tip deflection.
Reply With Quote
  #10  
Old 02-17-2017, 03:38 PM
dkard's Avatar
dkard dkard is offline
 
Join Date: Jun 2005
Location: Utah
Posts: 1,268
Thanks: 42
Thanked 172 Times in 117 Posts
dkard is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

It is pretty hard to curve a round stock. I think The flat has a lot to do with getting the recurve into the limb. The wide is for stability.

dave
Reply With Quote
  #11  
Old 02-19-2017, 07:59 AM
Sid's Avatar
Sid Sid is offline
 
Join Date: Feb 2007
Location: Scotland
Posts: 5,455
Thanks: 555
Thanked 1,871 Times in 1,093 Posts
Sid is on a distinguished road
Default Re: Why are modern recurve limbs generally flat and wide?

Quote:
Originally Posted by Tooner View Post
I probably should have said lateral stability and not torsional stability. A "square" or "round" structure is by definition equally as thick as it is wide. A recurve limb isn't. A longbow limb can get away with being narrower (side to side) because there isn't a hook in the end and therefore has much less chance of lateral tip deflection.
But recurves struggle with torsional stability.

A prof of mechanical engineering agrees with us on that front.
Reply With Quote
Reply

Tags
flat, generally, limbs, modern, recurve, wide

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Powered by vBadvanced CMPS v3.2.3

All times are GMT -7. The time now is 12:09 PM.



Design By: Miner Skinz.com
Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
PBCustom Strings 2004