--===============88169085242314349== Content-Type: multipart/alternative; boundary="_71ef95d6-c59a-4599-b62b-800cc318332a_" --_71ef95d6-c59a-4599-b62b-800cc318332a_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gary Nicholson said: "Ok so what we need=20 to take into account is really not just the rise but resistance to bendin= g=20 over the whole section. Dips hinges ECT will in effect slow the rod down.= Just=20 thinking so really the most resistance to bending would be in a convex=20 taper." Gary & others, I'm a little late getting into this conversation. But I've done a lot of r= esearch on this using a deflection model. Just thought someone might find = it interesting. Glad to hear that Al has built a deflection model. Maybe = Larry can add something like that to RodDNA some day. My research included= 444 3wt to 6wt hex tapers from the RodDNA database. The distribution of t= aper designs is very interesting...to a numbers geek like me. Over the fu= ll length of the tapers (not individual sections), the designs fall into a = clearly defined band of convex to concave tapers. The overall tip deflecti= on can be identical from convex to concave with diametrically opposed slope= s. But the convex and concave tapers will feel very different (e.g. Young = vs. Dickerson). That's one of the really cool things about bamboo rods. T= hey can be designed to have about the same overall deflection but fit entir= ely different casting strokes. =20 So...will a convex taper be more resistant to bending than a concave taper?= No. Not if you take into account the overall bending characteristics of = the rod from butt to tip. Convex and concave tapers can have the same over= all tip deflection. My research is posted on the blog. I've explained the= methods I used in detail and summarized the results in several charts and = tables. One of my favorites is a table the compares the overall design cha= racteristics by maker. Most makers dabbled in both convex and concave desi= gns. But there are a few that pushed it to the limit...like Young and Pezo= n convex tapers, and Divine and Dickerson concave tapers. I've extrapolate= d a series of standard tapers from a series of Payne's, Garrison's and Youn= g's that cover the full range of designs from convex to concave. All of my= standard tapers have the same relative deflection for each respective line= weight and rod length. It's going to take a few years to make them all bu= t I'm off to a good start. If anyone's interested go to the blog and select the "tapers" category from= the menu on the left. Scroll down to "Taper Research #1" and read the fou= r taper research posts in order. They won't make sense if you don't start = with the first post. Actually, they probably won't make sense anyway. But= it was fun doing the research. =20 By the way, standard taper number 1 is pretty cool. It's a "concave" taper= . I've made it in a 7.5ft 2pc 5wt and a 7ft 4pc 4wt. Both are sweet rods.= The taper design is similar to a Payne 101. Standard taper numbers 2 and= 4 are roughed in and ready to plane for 7ft 4wts, 7.5ft 5wts, and 8ft 6wts= . If anyone uses these tapers please let me know how they turn out. David Bolin Making bamboo fly rods and fishing the Ozarks=20 www.searcysowbug.blogspot.com _________________________________________________________________ Climb to the top of the charts!=A0Play the word scramble challenge with sta= r power. http://club.live.com/star_shuffle.aspx?icid=3Dstarshuffle_wlmailtextlink_ja= n= --_71ef95d6-c59a-4599-b62b-800cc318332a_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gary Nicholson said:"Ok so what we need=20 to take into account is really not just the rise but resistance to bendin= g=20 over the whole section. Dips hinges ECT will in effect slow the rod down.= Just=20 thinking so really the most resistance to bending would be in a convex=20 taper."
Gary & others,
I'm a little late getting into this conversation.= But I've done a lot of research on this using a deflection model.&nb= sp; Just thought someone might find it interesting. Glad to hear that= Al has built a deflection model. Maybe Larry can add something like = that to RodDNA some day. My research included 444 3wt to 6wt hex tape= rs from the RodDNA database. The distribution of taper designs is ver= y interesting...to a numbers geek like me. Over the full length= of the tapers (not individual sections), the designs fall into a clearly d= efined band of convex to concave tapers. The overall tip deflection c= an be identical from convex to concave with diametrically opposed slopes.&n= bsp; But the convex and concave tapers will feel very different (e.g. Young= vs. Dickerson). That's one of the really cool things about bamboo ro= ds. They can be designed to have about the same overall deflection bu= t fit entirely different casting strokes.
So...will a convex = taper be more resistant to bending than a concave taper? No. No= t if you take into account the overall bending characteristics of the rod f= rom butt to tip. Convex and concave tapers can have the same overall = tip deflection. My research is posted on the blog. I've explain= ed the methods I used in detail and summarized the results in several chart= s and tables. One of my favorites is a table the compares the overall= design characteristics by maker. Most makers dabbled in both convex = and concave designs. But there are a few that pushed it to the limit.= ..like Young and Pezon convex tapers, and Divine and Dickerson concave tape= rs. I've extrapolated a series of standard tapers from a series of Pa= yne's, Garrison's and Young's that cover the full range of designs from con= vex to concave. All of my standard tapers have the same relative defl= ection for each respective line weight and rod length. It's going to = take a few years to make them all but I'm off to a good start.
If an= yone's interested go to the blog and select the "tapers" category from the = menu on the left. Scroll down to "Taper Research #1" and read the fou= r taper research posts in order. They won't make sense if you don't s= tart with the first post. Actually, they probably won't make sense an= yway. But it was fun doing the research.
By the way, st= andard taper number 1 is pretty cool. It's a "concave" taper. I= 've made it in a 7.5ft 2pc 5wt and a 7ft 4pc 4wt. Both are sweet rods= . The taper design is similar to a Payne 101. Standard taper nu= mbers 2 and 4 are roughed in and ready to plane for 7ft 4wts, 7.5ft 5wts, a= nd 8ft 6wts. If anyone uses these tapers please let me know how they = turn out.
David Bolin
Making bamboo fly rods and fishing the Ozar= ks
www.searcysowbug.blogspot.com
Climb to the top of the charts!=A0Play the word scramble challeng= e with star power. Play now! = --_71ef95d6-c59a-4599-b62b-800cc318332a_-- --===============88169085242314349== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ RODMAKERS mailing list http://smtp.goldrush.com/mailman/listinfo/rodmakers --===============88169085242314349==--