I went to a club meeting at Darley Moor sometime in the 80's.
There was a very unspectacular looking caravan and awning with a nice looking Norton in it.
I assumed it was some nut-job trying to make a Commando keep up with the modern Jap stuff, but a crowd started gathering around it so I joined in.
Turned out to be the very first outing of the factory rotary racers!
I can't remember how they did, can't even remember if they finished, but I will always remember the unique and blood curdling noise they made!
Like many others, I followed them quite a bit over the next few years, which was a great time. But that first meeting will always stay in my memory.