“I'm inclined to support compulsory mode C or S in everything with an engine”
Support it all you want it will never come to pass. It would ground 1000’s of aircraft and the CAA have realised it cannot do this.
“and they are used to travel.... how far on average from the launch point???”
As has been said, they only have to get airborne to be a threat
“We all share the same airspace, and each of us ought to be chucking something into the common pot..”
I have no problem with this. I have mode c, which is entirely adequate, in fact overkill for my long distance VFR touring. What I object to are people who know nothing about the light end of aviation making sweeping statements when they have no idea of the impact.
I am sure almost all high-end micros would fit transponders tomorrow, if the rules on empty weight were changed. I have no expectation that the rules will change this side of EASA taking over completely, which is a long way off.
I am sure the gilders would fit them if it was technically possible, but in most cases it is not.
I am sure the Lutons and Turbulents will not fit them as the technical challenge is too great on an aircraft worth £3000 all in.
Do we really want to ground all this because some rich guys with all the toys cannot be bothered to work on lookout. If you all feel that without a transponder you are in too much danger to carry on flying then give up and let the rest of us have a bit more room to play with. I have always believed in the brotherhood of aviation, but perhaps I am just incredibly stupid.
Rod1