John McDougall put a set of these on his Shadow, and made the balance beam function as on original brakes. He ran them a very short time and declared them to extremely dangerous, took them off and put his originals back on.
Too may way of thinking this is wrong. As has been stated earlier, in theory the force applied to the brake cams goes up considerably using the balance beam rather than a twin pull setup, this being done at the expense of a shorter travel on the lever becoming longer. I have argued with a very experience Professional engineer and Vincent owner who keeps insisting I am wrong, but changing force and travel is the basic principal of levers or how else could you roll a large railcar (wagon) just using a very long handled very short lever under one wheel on the tracks, as they used to do.
Twin shoes can be a bit grabby especially when damp, but doing that with almost 2X the force would indeed be dangerous, but this was NOT a issue with the Speet setup, but the installation based on incorrect assumptions.
Too may way of thinking this is wrong. As has been stated earlier, in theory the force applied to the brake cams goes up considerably using the balance beam rather than a twin pull setup, this being done at the expense of a shorter travel on the lever becoming longer. I have argued with a very experience Professional engineer and Vincent owner who keeps insisting I am wrong, but changing force and travel is the basic principal of levers or how else could you roll a large railcar (wagon) just using a very long handled very short lever under one wheel on the tracks, as they used to do.
Twin shoes can be a bit grabby especially when damp, but doing that with almost 2X the force would indeed be dangerous, but this was NOT a issue with the Speet setup, but the installation based on incorrect assumptions.
