I have found a couple of rigs useful when tipping on rivers but the flow and target species are the most important consideration on which i use at the time.
Rig 1 A paternoster rig with a tail of 3inches to the feeder or bomb and a hooklength of between 1ft and 4ft.This i use on slow sluggish rivers for bream and small fish like roach and perch.If i am getting sucked maggots or smashed casters without seeing the bite on the tip shorten the hooklength until you do.
Rig 2 for faster/medium flows.
Place a swivel inside a loop and tie 2 more smaller loops so you end up with 3 loops.The larger loop containing the swivel.Attach a feeder/bomb to the swivel and hooklength to the smallest loop.Shorten hooklength as in rig depending on bites.
Cannot help with rig diagrams but maybe someone else can.
Keith, the loop method you mention is a tether rig. If the line snaps a fish is left towing the bomb.
A straight foreward running leger like Dave suggests takes some beating.
Using a leger stop allows all most instant adjustment of the hook length and if a snap link is used to attach a bomb or feeder then this to can be changed quickly.
Although i agree with what you say re tether rig i forgot to mention that I ALWAYS use a lighter BS for the hooklengths.I have not found it to be a problem and not snapped off before.I have had the hooklength go but never the line above the large loop.Perhaps I have been lucky and not connected to anything big enough to cause it to go but i will think about changing to "Daves Rig" next time i go out.
Dont forget that your deliberatly making several weak points in your main line due to the number of knots you have to tie to make the 3 loop leger rig. I appreciate what your saying about the lighter hooklink but sods law applies. Rather than risk any problems I prefer not to use the 3 loop method.