During this debate on Claud Butler welded and bi-laminated frame construction there has been some claims made on behalf of the added strenght due to the bi-laminated method of construction.
To quote Clauds own words in numerous publications and adverts:
"CB. Bi-laminated construction is the greatest advance in frame building since the evolution of the safety bicycle. It is 25% stronger than the ordinry brazed joint, as proved by the official N.P.L.tensile test. Enables me to build your frame to any desired angles (if practicable) without lug pulling. Proved sound by practicable demonstrations on the roads and tracks of the world. THIS IS THE TYPE OF FRAME CONSTRUCTION I RECOMMEND."
If this is the case why wasn't it employed on his tandem frames? I have seen hundreds of Claud Butler tandems both lugless (welded) and lugged used on the track for road time trials and for touring. But never a bi-laminated tandem. If it was so strong surely the bi-laminated method of construction would make it ideal for tandem useage with the extra strains and loads placed on these frames especially when racing.
My father witnessed Reg Harris and I think he said Bannister rip the bottom brackets out of a Claud Butler tandem when they were racing at Herne Hill.
Have I missed a Claud Butler bi-laminated tandem? Is there such a thing in his catalogues? I have owned a Bill Philbrook made bi-laminated tandem and we all know that Bill worked for Claud's.
Is there a missing link?
Mick Butler Huntingdon Great Britain