re: [CR]Re Lugless frames/ bilam/performance


Date: Fri, 21 May 2004 20:45:29 -0400
From: HM & SS Sachs <sachs@erols.com>
To: classicrendezvous@bikelist.org, mountgerald@btopenworld.com
Subject: re: [CR]Re Lugless frames/ bilam/performance


Let us praise Mark Stevens, who brought us an actual frame joint rest report (below). I only wonder if the test done, an effort to cause failure by bending with slow application of increasing force, is the best way to guage suitability for bicycle use. It certainly does not yield a stress-strain (force v. deformation) curve, which I would think would approximate joint "stiffness." It certainly doesn't do megacycles of small bending action, which might test the brass-steel joint itself. But, maybe the National Physical Laboratory was in the Department of Commerce (as is our National INstitute of Standards and Technology, which sometimes does superb work, and I've also seen them overcomplicate what seem to be simple issues).

harvey sachs mcLean VA ++++++++++++++++

Richie, there was a study carried out by National Physical Laboratory, Teddington England on behalf of Gillotts. They were marketing their " L"Atlantique" at the time and reproduced these results in their circa 1950 catalogue.
   Quote;
                                     About the Famous "L'Atlantique" For too long welded frames have had a bad reputation _ and in truth many of those produced deserved the stigma. Too often they were badly made without thought of the particular requirements a lug-less frame needed and frequently the skill of the maker left much to be desired. We knew that this state of affairs was unnecessary and that properly made a welded frame was the equal of the more orthodox lugged frame. In introducing the famous "L'Atlantique" three years ago we demonstrated our faith, which has been amply justified. Today it is firmly established as the finest welded frame made, worthy to stand on its merits equally with its stable companion, the famous connoisseur lugged frame. Not only does the National Physical Laboratory support our opinion, but riders have also proved it in the only practical way they can- by hard riding over along period.
     All our welders hold A.I.D Certificates and they are specialists in cycle frame construction. This fact, combined with the special 531 tubing we use, is the reason why the "L'Atlantique" is so popular today. Here is the reproduction of the report from the National Physical Laboratory.