--- In STMFC@..., "David Ball" <davidball@x...> wrote:
Has it been determined the practical minimum radius the PROTO:HO couple can be used for effective operation? I'm thinking literally how tight can the radius be before it may cause problems for the coupler, not just that it cope with typical tight radius like 18"
Judging by the responses to your question so far, the answer is "no." Might be time to buy a few sets, do some experimentation, and let us know your findings.